First DRSSTC; questions about dimensions
Anaesthetix, Sat Sept 19 2015, 02:18PMHello fellow coilers, I am planning to build my first DRSSTC. I have some experience with spark gap coils and small sstc's. But since DRSSTC's are quite different, I would like to ask you for some help.
First of all, I don't have a specific size I want, it just needs to be impressive for its size.
I am planning to use a CM300DY-24NF half-bridge to do the heavy lifting, with 325V at the bus (no doubler - rectified 230V ac, could go for a doubler if advised). For the MMC I will be using CDE 942 series caps for 225nF at 4KV, this could be increased to 300nF since I have some spares.
My question is about the secondary size and wire diameter. My current design uses a 12,5cm dia, 65cm high coil, with 32 AWG wire for 2600 turns. Since I am using a big (slow) igbt, my guess is I should keep my Fres relatively low. I've put this in JavaTC, which gives me this output:
Does this look any good? I have the feeling 32AWG wire would be too thin. I could change this to 30AWG for an Fres ~100kHz, but will my cm300 brick be able to handle this? Any comments on this or other specs would be greatly appreciated! Thanks.
Re: First DRSSTC; questions about dimensions
nzoomed, Sun Sept 20 2015, 12:01AM
I also believe a HD aspect ratio of 4:5 is important too.
Here are my my specs.
nzoomed, Sun Sept 20 2015, 12:01AM
Anaesthetix wrote ...
Hello fellow coilers, I am planning to build my first DRSSTC. I have some experience with spark gap coils and small sstc's. But since DRSSTC's are quite different, I would like to ask you for some help.
First of all, I don't have a specific size I want, it just needs to be impressive for its size.
I am planning to use a CM300DY-24NF half-bridge to do the heavy lifting, with 325V at the bus (no doubler - rectified 230V ac, could go for a doubler if advised). For the MMC I will be using CDE 942 series caps for 225nF at 4KV, this could be increased to 300nF since I have some spares.
My question is about the secondary size and wire diameter. My current design uses a 12,5cm dia, 65cm high coil, with 32 AWG wire for 2600 turns. Since I am using a big (slow) igbt, my guess is I should keep my Fres relatively low. I've put this in JavaTC, which gives me this output:
Does this look any good? I have the feeling 32AWG wire would be too thin. I could change this to 30AWG for an Fres ~100kHz, but will my cm300 brick be able to handle this? Any comments on this or other specs would be greatly appreciated! Thanks.
I too am building my first coil, your specs are somewhat similar to mine, im using cm300dy-24h but im going to be using a voltage doubler since it will give you twice the bus voltage and almost double the output if you are wanting long sparks this is what i would recommend.Hello fellow coilers, I am planning to build my first DRSSTC. I have some experience with spark gap coils and small sstc's. But since DRSSTC's are quite different, I would like to ask you for some help.
First of all, I don't have a specific size I want, it just needs to be impressive for its size.
I am planning to use a CM300DY-24NF half-bridge to do the heavy lifting, with 325V at the bus (no doubler - rectified 230V ac, could go for a doubler if advised). For the MMC I will be using CDE 942 series caps for 225nF at 4KV, this could be increased to 300nF since I have some spares.
My question is about the secondary size and wire diameter. My current design uses a 12,5cm dia, 65cm high coil, with 32 AWG wire for 2600 turns. Since I am using a big (slow) igbt, my guess is I should keep my Fres relatively low. I've put this in JavaTC, which gives me this output:
Does this look any good? I have the feeling 32AWG wire would be too thin. I could change this to 30AWG for an Fres ~100kHz, but will my cm300 brick be able to handle this? Any comments on this or other specs would be greatly appreciated! Thanks.
I also believe a HD aspect ratio of 4:5 is important too.
Here are my my specs.
Re: First DRSSTC; questions about dimensions
Mads Barnkob, Sun Sept 20 2015, 07:14AM
Welcome to the forum, you are in the right place for advice on building DRSSTC :) You should add you other coils to the show your Tesla coil thread that is a sticky in this forum.
With CM300 bricks you properly would have your current limit set at 800-1000A, this would give you some good 2 meter sparks.
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator
I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz.
You secondary specifications look fine, I am however wondering if you are only using a small topload, since you still have a rather high resonant frequency compared to the number of windings. DRSSTCs like larger toploads than SGTC, they need more capacitance to feed the growth of sparks and to withstand the spark load that will pull the resonant frequency down more with a small topload.
Some day it is my plan to upgrade this DRSSTC from 60N60 IGBTs to a fullbridge of CM300.
Mads Barnkob, Sun Sept 20 2015, 07:14AM
Anaesthetix wrote ...
Hello fellow coilers, I am planning to build my first DRSSTC. I have some experience with spark gap coils and small sstc's. But since DRSSTC's are quite different, I would like to ask you for some help.
Hello fellow coilers, I am planning to build my first DRSSTC. I have some experience with spark gap coils and small sstc's. But since DRSSTC's are quite different, I would like to ask you for some help.
Welcome to the forum, you are in the right place for advice on building DRSSTC :) You should add you other coils to the show your Tesla coil thread that is a sticky in this forum.
Anaesthetix wrote ...
First of all, I don't have a specific size I want, it just needs to be impressive for its size.
I am planning to use a CM300DY-24NF half-bridge to do the heavy lifting, with 325V at the bus (no doubler - rectified 230V ac, could go for a doubler if advised). For the MMC I will be using CDE 942 series caps for 225nF at 4KV, this could be increased to 300nF since I have some spares.
First of all, I don't have a specific size I want, it just needs to be impressive for its size.
I am planning to use a CM300DY-24NF half-bridge to do the heavy lifting, with 325V at the bus (no doubler - rectified 230V ac, could go for a doubler if advised). For the MMC I will be using CDE 942 series caps for 225nF at 4KV, this could be increased to 300nF since I have some spares.
With CM300 bricks you properly would have your current limit set at 800-1000A, this would give you some good 2 meter sparks.
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator
I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz. Anaesthetix wrote ...
My question is about the secondary size and wire diameter. My current design uses a 12,5cm dia, 65cm high coil, with 32 AWG wire for 2600 turns. Since I am using a big (slow) igbt, my guess is I should keep my Fres relatively low. I've put this in JavaTC, which gives me this output:
Does this look any good? I have the feeling 32AWG wire would be too thin. I could change this to 30AWG for an Fres ~100kHz, but will my cm300 brick be able to handle this? Any comments on this or other specs would be greatly appreciated! Thanks.
My question is about the secondary size and wire diameter. My current design uses a 12,5cm dia, 65cm high coil, with 32 AWG wire for 2600 turns. Since I am using a big (slow) igbt, my guess is I should keep my Fres relatively low. I've put this in JavaTC, which gives me this output:
Does this look any good? I have the feeling 32AWG wire would be too thin. I could change this to 30AWG for an Fres ~100kHz, but will my cm300 brick be able to handle this? Any comments on this or other specs would be greatly appreciated! Thanks.
You secondary specifications look fine, I am however wondering if you are only using a small topload, since you still have a rather high resonant frequency compared to the number of windings. DRSSTCs like larger toploads than SGTC, they need more capacitance to feed the growth of sparks and to withstand the spark load that will pull the resonant frequency down more with a small topload.
Some day it is my plan to upgrade this DRSSTC from 60N60 IGBTs to a fullbridge of CM300.
Re: First DRSSTC; questions about dimensions
nzoomed, Sun Sept 20 2015, 09:45AM
My coil is going to be similar spec to this but with a voltage doubled 230v bus my MMC was going to be 8KV rated, will this be enough for my coil?
Im also confused about current limit when people quote 1000A.
What part of the system is drawing that much current? It cant be the secondary because that is usually in the micro ampers range at that such high voltage.
nzoomed, Sun Sept 20 2015, 09:45AM
Mads Barnkob wrote ...
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz.
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator
I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz. My coil is going to be similar spec to this but with a voltage doubled 230v bus my MMC was going to be 8KV rated, will this be enough for my coil?
Im also confused about current limit when people quote 1000A.
What part of the system is drawing that much current? It cant be the secondary because that is usually in the micro ampers range at that such high voltage.
Re: First DRSSTC; questions about dimensions
Mads Barnkob, Sun Sept 20 2015, 10:27AM
Below the MMC calculator, all the equations used are listed, here is the specific for your question about supply voltage vs. MMC rating
MMC Zc, impedance: Zc = SQRT(ESR^2 + Xc^2). ESR is the combined ESR for the MMC. Xc is the MMC reactanse from above.
Voltage over MMC: Voltage over MMC = Zc * primary peak current
As you can see, the voltage across the MMC is only a product of the impedance and current.
The peak current that we talk about limiting is the current that circulates in the primary circuit, through IGBT switches, primary coil and primary capacitor. The voltage and current rise in each switch cycle of a DRSSTC is explained here:
Mads Barnkob, Sun Sept 20 2015, 10:27AM
nzoomed wrote ...
My coil is going to be similar spec to this but with a voltage doubled 230v bus my MMC was going to be 8KV rated, will this be enough for my coil?
Im also confused about current limit when people quote 1000A.
What part of the system is drawing that much current? It cant be the secondary because that is usually in the micro ampers range at that such high voltage.
Mads Barnkob wrote ...
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz.
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator
I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz. My coil is going to be similar spec to this but with a voltage doubled 230v bus my MMC was going to be 8KV rated, will this be enough for my coil?
Im also confused about current limit when people quote 1000A.
What part of the system is drawing that much current? It cant be the secondary because that is usually in the micro ampers range at that such high voltage.
Below the MMC calculator, all the equations used are listed, here is the specific for your question about supply voltage vs. MMC rating
MMC Zc, impedance: Zc = SQRT(ESR^2 + Xc^2). ESR is the combined ESR for the MMC. Xc is the MMC reactanse from above.
Voltage over MMC: Voltage over MMC = Zc * primary peak current
As you can see, the voltage across the MMC is only a product of the impedance and current.
The peak current that we talk about limiting is the current that circulates in the primary circuit, through IGBT switches, primary coil and primary capacitor. The voltage and current rise in each switch cycle of a DRSSTC is explained here:
Re: First DRSSTC; questions about dimensions
nzoomed, Sun Sept 20 2015, 11:48AM
That calculator is useful, it looks like i will be OK up to around 700A, although i dont know if i will be going over that limit if i push it to the limit which i will want to get the longest sparks possible in the end.
I didnt think that 700-1000A would ever be possible on the primary, thats alot of current!
I take it that this is measured in very short bursts per cycle, since the wall outlet is only able to supply me about 15A but is it different for DC?
nzoomed, Sun Sept 20 2015, 11:48AM
Mads Barnkob wrote ...
Below the MMC calculator, all the equations used are listed, here is the specific for your question about supply voltage vs. MMC rating
MMC Zc, impedance: Zc = SQRT(ESR^2 + Xc^2). ESR is the combined ESR for the MMC. Xc is the MMC reactanse from above.
Voltage over MMC: Voltage over MMC = Zc * primary peak current
As you can see, the voltage across the MMC is only a product of the impedance and current.
The peak current that we talk about limiting is the current that circulates in the primary circuit, through IGBT switches, primary coil and primary capacitor. The voltage and current rise in each switch cycle of a DRSSTC is explained here:
nzoomed wrote ...
My coil is going to be similar spec to this but with a voltage doubled 230v bus my MMC was going to be 8KV rated, will this be enough for my coil?
Im also confused about current limit when people quote 1000A.
What part of the system is drawing that much current? It cant be the secondary because that is usually in the micro ampers range at that such high voltage.
Mads Barnkob wrote ...
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz.
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator
I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz. My coil is going to be similar spec to this but with a voltage doubled 230v bus my MMC was going to be 8KV rated, will this be enough for my coil?
Im also confused about current limit when people quote 1000A.
What part of the system is drawing that much current? It cant be the secondary because that is usually in the micro ampers range at that such high voltage.
Below the MMC calculator, all the equations used are listed, here is the specific for your question about supply voltage vs. MMC rating
MMC Zc, impedance: Zc = SQRT(ESR^2 + Xc^2). ESR is the combined ESR for the MMC. Xc is the MMC reactanse from above.
Voltage over MMC: Voltage over MMC = Zc * primary peak current
As you can see, the voltage across the MMC is only a product of the impedance and current.
The peak current that we talk about limiting is the current that circulates in the primary circuit, through IGBT switches, primary coil and primary capacitor. The voltage and current rise in each switch cycle of a DRSSTC is explained here:
That calculator is useful, it looks like i will be OK up to around 700A, although i dont know if i will be going over that limit if i push it to the limit which i will want to get the longest sparks possible in the end.
I didnt think that 700-1000A would ever be possible on the primary, thats alot of current!
I take it that this is measured in very short bursts per cycle, since the wall outlet is only able to supply me about 15A but is it different for DC?
Re: First DRSSTC; questions about dimensions
Anaesthetix, Sun Sept 20 2015, 12:53PM
Thank you very much nzoomed and Mads for your input.
The revised specs:
Anaesthetix, Sun Sept 20 2015, 12:53PM
Thank you very much nzoomed and Mads for your input.
Mads Barnkob wrote ...
Welcome to the forum, you are in the right place for advice on building DRSSTC :) You should add you other coils to the show your Tesla coil thread that is a sticky in this forum.
Thank you. I'll be sure to post my other coils soon! My small sstc is getting a revision currently.Welcome to the forum, you are in the right place for advice on building DRSSTC :) You should add you other coils to the show your Tesla coil thread that is a sticky in this forum.
Mads Barnkob wrote ...
With CM300 bricks you properly would have your current limit set at 800-1000A, this would give you some good 2 meter sparks.
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz.
With CM300 bricks you properly would have your current limit set at 800-1000A, this would give you some good 2 meter sparks.
a 225nF/4kV MMC is too small voltage rating vise for a CM300 coil, using my MMC calculator I would use a MMC at 300nF/8kV, 4 in series and 8 strings in parallel to have a MMC that fits the ratings of a coil running 1000A at 80kHz.
Mads Barnkob wrote ...
The peak current that we talk about limiting is the current that circulates in the primary circuit, through IGBT switches, primary coil and primary capacitor. The voltage and current rise in each switch cycle of a DRSSTC is explained here:
Okay, I'll order some more capacitors. 2 meter sparks would definitely be impressive. Using the theory for voltage rise with a halfbridge at 325V (half bridge without doubler, so it switches 325V - 0V, other end of primary kept at 162,5V) gives me a little over 6KV after 10 full cycles. This would give me a max current of 850A with 15uH primary and Fres 75kHz. So if I switch to a full-bridge or a half-bridge with doubler, am I correct in saying that the voltage rating of the MMC would need to be doubled?The peak current that we talk about limiting is the current that circulates in the primary circuit, through IGBT switches, primary coil and primary capacitor. The voltage and current rise in each switch cycle of a DRSSTC is explained here:
Mads Barnkob wrote ...
You secondary specifications look fine, I am however wondering if you are only using a small topload, since you still have a rather high resonant frequency compared to the number of windings. DRSSTCs like larger toploads than SGTC, they need more capacitance to feed the growth of sparks and to withstand the spark load that will pull the resonant frequency down more with a small topload.
I've tried adding a bigger topload (15cm * 60cm) which gives me Fres=75kHz. I've also tried adding a second toroid, but this only changes the Fres with a percent or so. You secondary specifications look fine, I am however wondering if you are only using a small topload, since you still have a rather high resonant frequency compared to the number of windings. DRSSTCs like larger toploads than SGTC, they need more capacitance to feed the growth of sparks and to withstand the spark load that will pull the resonant frequency down more with a small topload.
The revised specs:
Mads Barnkob wrote ...
Some day it is my plan to upgrade this DRSSTC from 60N60 IGBTs to a fullbridge of CM300.
That is one pretty coil you have there! Inspires me even more to build one of my own.Some day it is my plan to upgrade this DRSSTC from 60N60 IGBTs to a fullbridge of CM300.
Re: First DRSSTC; questions about dimensions
Uspring, Sun Sept 20 2015, 03:40PM
@nzoomed:
@Anaesthitix:
Uspring, Sun Sept 20 2015, 03:40PM
@nzoomed:
What part of the system is drawing that much current? It cant be the secondary because that is usually in the micro ampers range at that such high voltage.Big TC arcs with a meter or more length draw several amps of current.
I take it that this is measured in very short bursts per cycle, since the wall outlet is only able to supply me about 15A but is it different for DC?Yes, the high bridge current draw is buffered by the big electrolytics on the bus.
@Anaesthitix:
Using the theory for voltage rise with a halfbridge at 325V (half bridge without doubler, so it switches 325V - 0V, other end of primary kept at 162,5V) gives me a little over 6KV after 10 full cycles. This would give me a max current of 850A with 15uH primary and Fres 75kHz. So if I switch to a full-bridge or a half-bridge with doubler, am I correct in saying that the voltage rating of the MMC would need to be doubled?That would be the case if the primary would ramp up current for the full 10 cycles you assumed. If you wouldn't change the capacitance of the MMC, that would also imply doubling primary current. Usually arc loading limits primary current long before the 10 cycles end, but only if the coil is properly tuned. The trick is to tune the coil in such a way, that you won't hit the OCD. That or the OCD will also prevent the MMC from acquiring too much voltage.
Re: First DRSSTC; questions about dimensions
nzoomed, Sun Sept 20 2015, 08:43PM
That is the same size im going for in my coil too.
Should be easy to make with ducting, but does anyone know where can i get a spun one of these from?
Im thinking of making it myself, but dont think it will be easy.
nzoomed, Sun Sept 20 2015, 08:43PM
Anaesthetix wrote ...
[/quote1442751372]
I've tried adding a bigger topload (15cm * 60cm) which gives me Fres=75kHz. I've also tried adding a second toroid, but this only changes the Fres with a percent or so.
The revised specs:
[/quote1442751372]
I've tried adding a bigger topload (15cm * 60cm) which gives me Fres=75kHz. I've also tried adding a second toroid, but this only changes the Fres with a percent or so.
The revised specs:
That is the same size im going for in my coil too.
Should be easy to make with ducting, but does anyone know where can i get a spun one of these from?
Im thinking of making it myself, but dont think it will be easy.
Re: First DRSSTC; questions about dimensions
Anaesthetix, Mon Sept 21 2015, 11:56AM
Anaesthetix, Mon Sept 21 2015, 11:56AM
Uspring wrote ...
@Anaesthitix:
Okay, thank you! I'll probably go for a doubler then, will do some tests on lower bus voltage anyway, to see how it behaves.@Anaesthitix:
Using the theory for voltage rise with a halfbridge at 325V (half bridge without doubler, so it switches 325V - 0V, other end of primary kept at 162,5V) gives me a little over 6KV after 10 full cycles. This would give me a max current of 850A with 15uH primary and Fres 75kHz. So if I switch to a full-bridge or a half-bridge with doubler, am I correct in saying that the voltage rating of the MMC would need to be doubled?That would be the case if the primary would ramp up current for the full 10 cycles you assumed. If you wouldn't change the capacitance of the MMC, that would also imply doubling primary current. Usually arc loading limits primary current long before the 10 cycles end, but only if the coil is properly tuned. The trick is to tune the coil in such a way, that you won't hit the OCD. That or the OCD will also prevent the MMC from acquiring too much voltage.
nzoomed wrote ...
That is the same size im going for in my coil too.
Should be easy to make with ducting, but does anyone know where can i get a spun one of these from?
Im thinking of making it myself, but dont think it will be easy.
I'll make my toroid from ducting. Always used that for my other coils, it looks and works great. If you try to spin one yourself, let me know how it worked out for you. It would be awesome to be able to make these yourself.That is the same size im going for in my coil too.
Should be easy to make with ducting, but does anyone know where can i get a spun one of these from?
Im thinking of making it myself, but dont think it will be easy.
Re: First DRSSTC; questions about dimensions
nzoomed, Fri Sept 25 2015, 11:28AM
My mate has a wood lathe so he will be able to turn up a former and hopefully be able to shape a toroid on it.
I like the smooth look of an aluminium toroid and they are supposed to be better for breakout as you lust make one point at the top with a drawing pin etc.
I might have to settle for ducting for the time being though as its the cheapest and easiest option.
nzoomed, Fri Sept 25 2015, 11:28AM
Anaesthetix wrote ...
Uspring wrote ...
@Anaesthitix:
Okay, thank you! I'll probably go for a doubler then, will do some tests on lower bus voltage anyway, to see how it behaves.@Anaesthitix:
Using the theory for voltage rise with a halfbridge at 325V (half bridge without doubler, so it switches 325V - 0V, other end of primary kept at 162,5V) gives me a little over 6KV after 10 full cycles. This would give me a max current of 850A with 15uH primary and Fres 75kHz. So if I switch to a full-bridge or a half-bridge with doubler, am I correct in saying that the voltage rating of the MMC would need to be doubled?That would be the case if the primary would ramp up current for the full 10 cycles you assumed. If you wouldn't change the capacitance of the MMC, that would also imply doubling primary current. Usually arc loading limits primary current long before the 10 cycles end, but only if the coil is properly tuned. The trick is to tune the coil in such a way, that you won't hit the OCD. That or the OCD will also prevent the MMC from acquiring too much voltage.
nzoomed wrote ...
That is the same size im going for in my coil too.
Should be easy to make with ducting, but does anyone know where can i get a spun one of these from?
Im thinking of making it myself, but dont think it will be easy.
I'll make my toroid from ducting. Always used that for my other coils, it looks and works great. If you try to spin one yourself, let me know how it worked out for you. It would be awesome to be able to make these yourself.That is the same size im going for in my coil too.
Should be easy to make with ducting, but does anyone know where can i get a spun one of these from?
Im thinking of making it myself, but dont think it will be easy.
My mate has a wood lathe so he will be able to turn up a former and hopefully be able to shape a toroid on it.
I like the smooth look of an aluminium toroid and they are supposed to be better for breakout as you lust make one point at the top with a drawing pin etc.
I might have to settle for ducting for the time being though as its the cheapest and easiest option.
Re: First DRSSTC; questions about dimensions
Anaesthetix, Mon Sept 28 2015, 08:09PM
So, my CM300 brick got delivered today. Thought the F series had over current protection. Opened the brick to remove the protection, but I guess I thought wrong. Lots of dust in there, tried to remove it but that stuff is sticky..
Bit offtopic maybe, but is anyone interested to see how the project progresses? If so, I'd be happy to post it here.
Anaesthetix, Mon Sept 28 2015, 08:09PM
nzoomed wrote ...
My mate has a wood lathe so he will be able to turn up a former and hopefully be able to shape a toroid on it.
I like the smooth look of an aluminium toroid and they are supposed to be better for breakout as you lust make one point at the top with a drawing pin etc.
I might have to settle for ducting for the time being though as its the cheapest and easiest option.
True, can't get anything better / more beautiful than a spun one. Would have gone for one too, if they weren't so expensive. Maybe in a later stage.My mate has a wood lathe so he will be able to turn up a former and hopefully be able to shape a toroid on it.
I like the smooth look of an aluminium toroid and they are supposed to be better for breakout as you lust make one point at the top with a drawing pin etc.
I might have to settle for ducting for the time being though as its the cheapest and easiest option.
So, my CM300 brick got delivered today. Thought the F series had over current protection. Opened the brick to remove the protection, but I guess I thought wrong. Lots of dust in there, tried to remove it but that stuff is sticky..
Bit offtopic maybe, but is anyone interested to see how the project progresses? If so, I'd be happy to post it here.
Re: First DRSSTC; questions about dimensions
Justin, Thu Oct 01 2015, 12:46PM
I think you should post it.
Justin, Thu Oct 01 2015, 12:46PM
I think you should post it.
Re: First DRSSTC; questions about dimensions
Patric, Thu Oct 01 2015, 02:50PM
Me too.
Patric, Thu Oct 01 2015, 02:50PM
Halfdead wrote ...
I think you should post it.
I think you should post it.
Me too.
Re: First DRSSTC; questions about dimensions
nzoomed, Thu Oct 01 2015, 07:55PM
Are the large toroids even available anywhere?
I cant see any over 300mm in diameter, i see loneoceans has some spun ones on his new twin set of coils that would be similar size to what im after.
Im thinking of adding a second toroid below to increase the capacitance as well as raising the height of the top toroid.
nzoomed, Thu Oct 01 2015, 07:55PM
Anaesthetix wrote ...
So, my CM300 brick got delivered today. Thought the F series had over current protection. Opened the brick to remove the protection, but I guess I thought wrong. Lots of dust in there, tried to remove it but that stuff is sticky..
Bit offtopic maybe, but is anyone interested to see how the project progresses? If so, I'd be happy to post it here.
nzoomed wrote ...
My mate has a wood lathe so he will be able to turn up a former and hopefully be able to shape a toroid on it.
I like the smooth look of an aluminium toroid and they are supposed to be better for breakout as you lust make one point at the top with a drawing pin etc.
I might have to settle for ducting for the time being though as its the cheapest and easiest option.
True, can't get anything better / more beautiful than a spun one. Would have gone for one too, if they weren't so expensive. Maybe in a later stage.My mate has a wood lathe so he will be able to turn up a former and hopefully be able to shape a toroid on it.
I like the smooth look of an aluminium toroid and they are supposed to be better for breakout as you lust make one point at the top with a drawing pin etc.
I might have to settle for ducting for the time being though as its the cheapest and easiest option.
So, my CM300 brick got delivered today. Thought the F series had over current protection. Opened the brick to remove the protection, but I guess I thought wrong. Lots of dust in there, tried to remove it but that stuff is sticky..
Bit offtopic maybe, but is anyone interested to see how the project progresses? If so, I'd be happy to post it here.
Are the large toroids even available anywhere?
I cant see any over 300mm in diameter, i see loneoceans has some spun ones on his new twin set of coils that would be similar size to what im after.
Im thinking of adding a second toroid below to increase the capacitance as well as raising the height of the top toroid.
Re: First DRSSTC; questions about dimensions
Anaesthetix, Tue Oct 06 2015, 04:26PM
Another question, since I'm using relatively thin wire (32 AWG), would it be advisable to use a thicker wire for the secondary leads? I was thinking to attach a thicker wire at the end of the first and last turn.
Anaesthetix, Tue Oct 06 2015, 04:26PM
Patric wrote ...
Me too.
Allright, I'll be posting a topic in the projects section when I get some more parts and can start building the coil!Halfdead wrote ...
I think you should post it.
I think you should post it.
Me too.
nzoomed wrote ...
Are the large toroids even available anywhere?
I cant see any over 300mm in diameter, i see loneoceans has some spun ones on his new twin set of coils that would be similar size to what im after.
Im thinking of adding a second toroid below to increase the capacitance as well as raising the height of the top toroid.
I haven't found any yet, only those small ones. A while ago I found someone who could make these on request, but I can't find him anymore. Maybe you could ask a metalworking business (am I saying this right?) if they could make one for you?Are the large toroids even available anywhere?
I cant see any over 300mm in diameter, i see loneoceans has some spun ones on his new twin set of coils that would be similar size to what im after.
Im thinking of adding a second toroid below to increase the capacitance as well as raising the height of the top toroid.
Another question, since I'm using relatively thin wire (32 AWG), would it be advisable to use a thicker wire for the secondary leads? I was thinking to attach a thicker wire at the end of the first and last turn.
Re: First DRSSTC; questions about dimensions
nzoomed, Wed Oct 07 2015, 05:49AM
Ive spoken to a few metal businesses. I think i can get one made from alloy pipe in two half bends welded together, but their machinery can only bend up to 100mm pipe i think. Spinning is possible, but as far as im aware it can only be done with a former, which would be a one off job for them so very expensive, thats why im talking about doing it myself on my mates wood lathe.
Anyway, as far as wire goes, im using 30AWG on my coil and i simply heatshrink the ends and screw on a terminal, seems to work OK.
nzoomed, Wed Oct 07 2015, 05:49AM
Anaesthetix wrote ...
Another question, since I'm using relatively thin wire (32 AWG), would it be advisable to use a thicker wire for the secondary leads? I was thinking to attach a thicker wire at the end of the first and last turn.
nzoomed wrote ...
Are the large toroids even available anywhere?
I cant see any over 300mm in diameter, i see loneoceans has some spun ones on his new twin set of coils that would be similar size to what im after.
Im thinking of adding a second toroid below to increase the capacitance as well as raising the height of the top toroid.
I haven't found any yet, only those small ones. A while ago I found someone who could make these on request, but I can't find him anymore. Maybe you could ask a metalworking business (am I saying this right?) if they could make one for you?Are the large toroids even available anywhere?
I cant see any over 300mm in diameter, i see loneoceans has some spun ones on his new twin set of coils that would be similar size to what im after.
Im thinking of adding a second toroid below to increase the capacitance as well as raising the height of the top toroid.
Another question, since I'm using relatively thin wire (32 AWG), would it be advisable to use a thicker wire for the secondary leads? I was thinking to attach a thicker wire at the end of the first and last turn.
Ive spoken to a few metal businesses. I think i can get one made from alloy pipe in two half bends welded together, but their machinery can only bend up to 100mm pipe i think. Spinning is possible, but as far as im aware it can only be done with a former, which would be a one off job for them so very expensive, thats why im talking about doing it myself on my mates wood lathe.
Anyway, as far as wire goes, im using 30AWG on my coil and i simply heatshrink the ends and screw on a terminal, seems to work OK.
Re: First DRSSTC; questions about dimensions
Alex Yuan, Sat Oct 10 2015, 06:07AM
32 should be okay. I used 34AWG on my 12cm x 40cm secondary and it gets a little warm after use.
Alex Yuan, Sat Oct 10 2015, 06:07AM
32 should be okay. I used 34AWG on my 12cm x 40cm secondary and it gets a little warm after use.
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