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oneTesla - a small single-board DRSSTC

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E.TexasTesla
Mon Nov 05 2012, 04:17AM
E.TexasTesla Registered Member #4362 Joined: Sat Jan 21 2012, 03:44AM
Location: Texas
Posts: 98
Yes both probes were set x10.


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Dr. ISOTOP
Thu Nov 15 2012, 08:56AM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
You can do a simple test by removing the current transformer and driving the CT pins with a 250KHz sine wave, while the interrupter is installed. If the signal at each IGBT gate is a reasonably nice 0-15V square-wave, then you can assume the signal pathway is intact and you did something silly on the power end of things.
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Dr. ISOTOP
Sat Nov 17 2012, 12:38AM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
...and, it turns out the coil was out of tune the whole time
here it is with a 2x8" spun toroid, slightly lower (!) on-times than before
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teravolt
Sat Nov 17 2012, 02:31AM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
what do you think your primary current is?
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Dr. ISOTOP
Sat Nov 17 2012, 10:18AM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
teravolt wrote ...

what do you think your primary current is?

Last I checked, it was around 300Apk
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teravolt
Sat Nov 17 2012, 06:12PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
that is ia nice setup, is that little ciol working with your new board? have you thought of selling that coil in your last video as a kit.
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Dr. ISOTOP
Sun Nov 18 2012, 04:22AM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
teravolt wrote ...

that is ia nice setup, is that little ciol working with your new board?
Yep, the new board adds a few little features such as a MIDI-signal-present indicator lamp and a fuse. It also tightens up the layout of the controller.

teravolt wrote ...

have you thought of selling that coil in your last video as a kit.
This has been in the works for a while; expect to see kits for sale soon, complete with laser-cut acrylic components and (cheap) optional pre-wound secondary.
For now, as usual, if you want a board you can PM me.
New pics
1353212558 2919 FT139829 Board

1353212558 2919 FT139829 Box

1353212558 2919 FT139829 Stacks
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Patrick
Sun Nov 18 2012, 04:27AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Dr. ISOTOP wrote ...



1353212558 2919 FT139829 Box

really cool box!
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E.TexasTesla
Sun Nov 18 2012, 07:46PM
E.TexasTesla Registered Member #4362 Joined: Sat Jan 21 2012, 03:44AM
Location: Texas
Posts: 98
Dr. ISOTOP wrote ...

You can do a simple test by removing the current transformer and driving the CT pins with a 250KHz sine wave, while the interrupter is installed. If the signal at each IGBT gate is a reasonably nice 0-15V square-wave, then you can assume the signal pathway is intact and you did something silly on the power end of things.

Ok, with the CT out of the circuit and a 200 khz (my signal generator only goes up to 200khz)
signal substituted both my igbt gates are still not square. The signal going into the gate transformer is also not square.

I think im done with this circuit. It looks nice and I beleive you guys did a good job with it but Ive blown way to many parts and money.


As far as the board and traces go they are in poor shape. This pcb was not designed to handle any repairs.
Desoldering with the correct tool still pulls traces up.


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Dr. ISOTOP
Sun Nov 18 2012, 08:01PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
E.TexasTesla wrote ...

Dr. ISOTOP wrote ...

You can do a simple test by removing the current transformer and driving the CT pins with a 250KHz sine wave, while the interrupter is installed. If the signal at each IGBT gate is a reasonably nice 0-15V square-wave, then you can assume the signal pathway is intact and you did something silly on the power end of things.

Ok, with the CT out of the circuit and a 200 khz (my signal generator only goes up to 200khz)
signal substituted both my igbt gates are still not square. The signal going into the gate transformer is also not square.

I think im done with this circuit. It looks nice and I beleive you guys did a good job with it but Ive blown way to many parts and money. If someone wants this for parts I will put it on ebay or trade for something.

As far as the board and traces go they are in poor shape. This pcb was not designed to handle any repairs.
Desoldering with the correct tool still pulls traces up.


The IGBT's don't particularly enjoy being desoldered.
The IC's should be socketed; desoldering a 14-pin package is nearly impossible even with proper tools.
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