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Registered Member #2685
Joined: Sun Feb 14 2010, 07:23PM
Location:
Posts: 11
Hello, I am testing the self resonant control board, and I have replaced all of the ICs at this point, but I am still not getting the first 0V-5V square wave in the testing procedure to come through. Instead I am getting a 500mV peak to peak square wave. Has anyone else had this problem?
Registered Member #4829
Joined: Thu May 10 2012, 04:55PM
Location: Los Angele, CA
Posts: 8
I didn't think it appropriate to start a thread over this, but just wondering if anyone has found a place to buy a PDF version of both these books? I too have the DRSSTC, but I hate paper, and have been contemplating buying the Mini-brute book, but I don't want another paper book. Just curious?
Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
UnionTesla I had the same problem on my controller board with really low voltages. Thought I had blown the ICs too. Turns out there was a break in the of the solder points that prevented the 74HC14 from getting a ground connection and so was not outputting the correct signal from pin 4. Took me a long time to find the problem and kept second guessing myself. Not saying this is your issue, but maybe it can help.
Registered Member #1524
Joined: Sun Jun 08 2008, 05:25PM
Location: Grand Junction, Colorado
Posts: 38
A few years ago when I built my miniBrute one of my main low performance issues was due to making a complete loop or ring with the strike rail. Back to the book found the part I missed and performance was reestablished. I put it away for a few months then found that the over current protection circuit was incorrectly powered. Following a posted repair I gained even more power and put it away. Today I'm playing again and after a few hours of making my neighbors look over the fence I noticed my secondary is leaning. It turns out I made another loop with the grounding. I stuck copper tape in a nice ring around the bottom 3/4" of the form. Well it heated up and the clear plastic started to melt. Now that is also fixed and I have a question. Does the toroid make a loop? I am using a aluminum duct 3" and I covered that with wall smoothing compound then covered that with aluminum tape. I found small blue sparks in the surface of the smooth finish where tape corners are. When I disassemble the thing I think the toroid is warmer then when I started. Is this another place where I could be loosing performance?
Registered Member #43110
Joined: Sat Feb 08 2014, 03:46PM
Location:
Posts: 6
I am currently building this coil, I am trying to get a better idea of how where to connect the RF ground. I have read and saw the pictures connecting the bottom of the secondary to a piece of copper strap on the side , but have either missed or it isn't there where to connect RF ground. Does this coil require a stake in the ground for it?
Edit: c101 is sorted heard back from Dan, just as FYI for future the 4.7 isn't used and the .1 goest from negative DC rail to earth ground. So still looking for info on how to ground and what points this coil.
/Also C101 does anyone know if it was changed I do not have a 4.7uF @600V but seem to have a poly cap that is .1 @ 2000V that seems to have no home? Thoughts /
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Polishedball wrote ...
I am currently building this coil, I am trying to get a better idea of how where to connect the RF ground. I have read and saw the pictures connecting the bottom of the secondary to a piece of copper strap on the side , but have either missed or it isn't there where to connect RF ground. Does this coil require a stake in the ground for it?
Edit: c101 is sorted heard back from Dan, just as FYI for future the 4.7 isn't used and the .1 goest from negative DC rail to earth ground. So still looking for info on how to ground and what points this coil.
/Also C101 does anyone know if it was changed I do not have a 4.7uF @600V but seem to have a poly cap that is .1 @ 2000V that seems to have no home? Thoughts /
Thanks
Did you read through this topic? Did you search for ground in this topic? I do not think you did any of those simple routines.
It is covered already at page 4:
site rules wrote ... Part II: Posting B. Do your own research. If you intend to ask a question, please make sure it isn't already addressed in the archives, or on the wiki. Also, be sure to perform at least a cursory Google search. Remember, nobody wants to do your homework for you. Show some effort, and the community will repay you in kind.
Registered Member #43110
Joined: Sat Feb 08 2014, 03:46PM
Location:
Posts: 6
Thanks you are correct. I only skimmed it, I did Google the topic prior and seems to be lots of opinions. That was why I came here and asked. I have now read the 16 pages. Thanks again for the link back.
I'll add build pics in my next post.
.
Mads Barnkob wrote ...
Polishedball wrote ...
I am currently building this coil, I am trying to get a better idea of how where to connect the RF ground. I have read and saw the pictures connecting the bottom of the secondary to a piece of copper strap on the side , but have either missed or it isn't there where to connect RF ground. Does this coil require a stake in the ground for it?
Edit: c101 is sorted heard back from Dan, just as FYI for future the 4.7 isn't used and the .1 goest from negative DC rail to earth ground. So still looking for info on how to ground and what points this coil.
/Also C101 does anyone know if it was changed I do not have a 4.7uF @600V but seem to have a poly cap that is .1 @ 2000V that seems to have no home? Thoughts /
Thanks
Did you read through this topic? Did you search for ground in this topic? I do not think you did any of those simple routines.
It is covered already at page 4:
site rules wrote ... Part II: Posting B. Do your own research. If you intend to ask a question, please make sure it isn't already addressed in the archives, or on the wiki. Also, be sure to perform at least a cursory Google search. Remember, nobody wants to do your homework for you. Show some effort, and the community will repay you in kind.
Registered Member #43110
Joined: Sat Feb 08 2014, 03:46PM
Location:
Posts: 6
Anyone spot any issue with this layout? Just wanted to ask before I wire it up. Thanks
Also can you tell me is there a way to test the phase of the gates, without the advanced modulator. That book has you using it. (I will own it shortly, but would like to test before it arrives.)
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Minibrute Construction Thread / FAQs
