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Old 12th November 2009, 05:59 PM   #11
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Jumper C1 in figure 2. The relays should never turn on. if they do, check Q1 - you should have ~0V emitter to collector.

Last edited by BobEllis; 12th November 2009 at 06:03 PM.
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Old 13th November 2009, 01:00 PM   #12
jmateus is offline jmateus  United States
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Default Protection #33

Yes, I've followed Rod's recommendations about the relays, I don't think the problem resides here.
The circuit has never functionned since the very beginning, the issue being that
was no delay whatsoever after the initial turn on. I thought the problem would
\be in fig 2 - Relay activation circuit, either C1 was not the proper size and that was
increased to 100uF. No luck.
\Then I assumed the circuit had something wrong and checked everything up to the
point that I was already fed up with it.
That's when I made a big mistake, took the OFF connection to ground, Puff, a spark
came up and after a few checks I found Q4 and D7 blown.
Replacing those didn't do too much for me, now the circcuit doesn't work, period.
To be frank folks I'm almost at the point to ditch the whole thing. Patience that's
what I don't have anymore.
By the way, the rail voltages are around 42 V, plus and minus.
Thank you for your interest, anyway.
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JLH 2005, Cyrus and so on...
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Old 13th November 2009, 01:56 PM   #13
RSK is offline RSK  Malaysia
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Default DC protect from Magazine

Hi Jmateus,
Attached, I have been using for sometime with good results.
It's from a online magazine that I have incorporate the output inductors.
Works very well. Mail me for more info if you want to build it.

Raj
Attached Files
File Type: pdf DCprotect.pdf (31.6 KB, 71 views)
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