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Offline 6666
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« Reply #200 on: August 03, 2011, 12:15:33 am »
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Try cutting the copper track and isolate the rest of the circuit from the output of the voltage reg and then measure the input and output of the reg, you should be able to find out what is dragging your voltage down,if its ok solder it and cut the next part of the pcb and so on ,if  its a problem with your pcb, then its better to find the fault on this pcb first, as the same fault could be on your new pcb to, give it a try.

I recently had a faulty -5 v reg, it did weird things when under a load.

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« Last Edit: August 03, 2011, 12:29:17 am by 6666 »
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Offline hamed_ghorbani
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« Reply #201 on: August 03, 2011, 01:23:15 am »
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I made circuit of 34063 with 7805,with out anything,it's work good,my pcb have problem,I try to find the fault on my pcb

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Offline hamed_ghorbani
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« Reply #202 on: August 05, 2011, 06:00:45 am »
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It's worked...but with 1LED,when I get 4or more led,I have that problem again
I made it at proteus..But...see my pic... Angry Angry
Why?!!!!!!!!!!!!!!!!!!!!!!!!! Angry Angry Angry Angry Angry

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Offline xavier
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« Reply #203 on: August 05, 2011, 08:36:41 am »
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Try connecting R4 ground to C1+  then tell us what.

Regards Xavier

Posted on: August 05, 2011, 03:24:50 PM
Also neg of volt meter is on ground in one simulation and on 12v in the other.

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So many questions so little time

Offline hamed_ghorbani
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« Reply #204 on: August 05, 2011, 08:36:55 am »
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-12v at output...

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Offline xavier
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« Reply #205 on: August 05, 2011, 08:44:20 am »
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What's the connection from D2 to ground?

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So many questions so little time

Offline hamed_ghorbani
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« Reply #206 on: August 05, 2011, 08:51:47 am »
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-12v again...
see pic

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Offline xavier
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« Reply #207 on: August 05, 2011, 09:05:16 am »
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Take out the connection from ground to pin 5 if you don't R3  and C1 are bridged

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So many questions so little time

Offline hamed_ghorbani
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« Reply #208 on: August 05, 2011, 09:18:44 am »
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I take 50k at pin 5 and c1
but...

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« Reply #209 on: August 05, 2011, 09:34:38 am »
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                       Why all this?-- follow this

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