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Old 27th November 2006, 03:43 PM   #501
BobEllis is offline BobEllis  United States
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Other than removing the short circuit protection, it seems like it should be fine.
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Old 27th November 2006, 03:43 PM   #502
JensRasmussen is offline JensRasmussen  Denmark
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Andy,

A diode solves the problem with startup, but I could not fit it on the board when I designed it....

Maybe I should try again, and get rid of the optional ref part (The standard zener)


\Jens
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Old 27th November 2006, 10:41 PM   #503
AndyB is offline AndyB  Norway
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Quote:
Originally posted by BobEllis
Other than removing the short circuit protection, it seems like it should be fine.

I can live with that

Andy
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Old 2nd January 2007, 08:12 AM   #504
dick van nierop is offline dick van nierop  Netherlands
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I had some problems with the negative board as a result of my own doing. I now have to replace the transistors but cannot find the exact BC- and MJE-types over here.
Can they be replaced by others and if so should I replace the transistors on the +board too?
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Old 2nd January 2007, 10:10 AM   #505
BobEllis is offline BobEllis  United States
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I suppose you could try any small signal transistor of the appropriate polarity, or you could wait or the BCs I am about to mail to arrive. To the same address as before?
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Old 2nd January 2007, 07:45 PM   #506
dick van nierop is offline dick van nierop  Netherlands
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Hi Bob

As always you are being most helpful.
May I wish you the best in 2007 and a happy diy year.

Are you ordering BC556C and 546C?
I can get plenty of the B-variant over here but they have a different gainfactor. Don't know what that would do to the performance.
Are you by any chance also ordering the MJE's? Can't get those either.

I'll also ask KRO where he gets his.
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Old 2nd January 2007, 07:53 PM   #507
BobEllis is offline BobEllis  United States
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I'm not ordering, I still have a few thousand BC546C and 556C from PSU round 1. I'm not planning to order any MJEs anytime soon - I have enough for now, but unfrtunately just a few extra. I always seem to smoke a couple along the way.
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Old 2nd January 2007, 08:37 PM   #508
dick van nierop is offline dick van nierop  Netherlands
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Thanks for answering, Bob.
I'll soon let you know if I would like you to send me some BC's.
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Old 2nd January 2007, 09:02 PM   #509
dfdye is offline dfdye  United States
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Quote:
Originally posted by BobEllis
I'm not ordering, I still have a few thousand BC546C and 556C from PSU round 1.
LOL

Well, I did my part to help and get rid of some! You originally ordered 10K, right?
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Old 2nd January 2007, 10:47 PM   #510
BobEllis is offline BobEllis  United States
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Yep, 10K of each. Sort of disappointing that they took up so little space.
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