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Old 18th May 2019, 03:28 PM   #1641
jan.didden is offline jan.didden  Europe
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Originally Posted by lauc View Post
I found my mistake. I used 100nF instead of 100pF for C11 / C12. I removed it and there's no more oscillation. I tried some values to confirm and indeed big values make trouble...

Sorry for that. Thanks for your help.
Yes that will f*ck it up bigtime.

Well done to find it - it is the personal errors that are the hardest to find!

Jan
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Old 24th May 2019, 05:57 PM   #1642
redjr is offline redjr  United States
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I recently completed the super regular board (v2.3b) using the standard BOM for +-15VDC output. I've been lurking here a bit reading posts. I'm running a 15VAC CT xformer into my rectification and filter board. I'm getting ~25VDC per rail going into the SR board.

On the output of the SR, I'm getting 25.2VDC on the positive rail and ~17.8VDC on the negative rail. 17.8 volts seems reasonable on the neg rail, but there doesn't seem to be anything being 'regulated' on the positive rail. No voltage on the sense lines on either rail. All measurements were made without a load.

I didn't skimp on the parts, as they were all new, sourced from Mouser here in the states. I've double-checked all the parts placement and values, and everything matches the schematic and PCB layout. I've re-flowed all solder joints as well.

I'm using the AD825 opamp, and have doubled-checked my soldering of the SMD on the 8-pin brown dog adapter. The pins all match. (Actually, this is my second set of AD825).

So, it would seem maybe a bad part, but not sure where to start looking. As with all my projects I buy extra parts, so I can do some replacing as necessary. Any ideas?
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Old 24th May 2019, 08:16 PM   #1643
ApolloZhang is offline ApolloZhang  Europe
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Originally Posted by redjr View Post
On the output of the SR, I'm getting 25.2VDC on the positive rail and ~17.8VDC on the negative rail. 17.8 volts seems reasonable on the neg rail, but there doesn't seem to be anything being 'regulated' on the positive rail. No voltage on the sense lines on either rail. All measurements were made without a load.
Havent looked at the standard BOM, but IMO if the Vref you are using is LM329, then the 17.8Vdc will be strange as well - with all the <1% tolerances in components, the output voltage should be some where near 15V, eg. 15.0x 14.9x... Perhaps the pass transistor on the pos rail is ESD damaged, try substituing it with a to92 transistor and hook up a 10k resistor as load
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Old 24th May 2019, 08:33 PM   #1644
jan.didden is offline jan.didden  Europe
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First you need to decide whether you want to diagnose this in a logical way or go for haphazard parts distribution.

If you decide for diagnosing, measure the DC at the opamp inputs, and the output. If you post this here we will be able to see what's wrong and I will explain my reasoning.

Jan
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Old 24th May 2019, 09:11 PM   #1645
jan.didden is offline jan.didden  Europe
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And ohh yes, you DID connect both the sense and sense returns to the output and output return, of course ... ?

Jan
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Old 25th May 2019, 04:26 AM   #1646
redjr is offline redjr  United States
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Originally Posted by jan.didden View Post
And ohh yes, you DID connect both the sense and sense returns to the output and output return, of course ... ?

Jan
I'm in bed reading this on my tablet, so I'll check tomorrow. I want to diagnose this properly. And no, I forgot to connect the sense lines. Duh! Older age is a real bitch. At least that's my excuse.

Rick
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Old 25th May 2019, 05:46 AM   #1647
jan.didden is offline jan.didden  Europe
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The give-away was that you have 25V or so at the output, and zero at the sense. Very likely it will be OK when you connect them.

If not, measure those opamp inputs and outputs.

Jan
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Old 25th May 2019, 01:49 PM   #1648
redjr is offline redjr  United States
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Originally Posted by jan.didden View Post
The give-away was that you have 25V or so at the output, and zero at the sense. Very likely it will be OK when you connect them.

If not, measure those opamp inputs and outputs.

Jan
That was it Jan. Once I connected the sense lines the voltages came down to 14.42 on both rails. Now to further raise the voltage to the desired 15v, I adjust the divider R6-R7 and R13-R14? Other thought?

Rick
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Old 25th May 2019, 02:06 PM   #1649
jan.didden is offline jan.didden  Europe
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Originally Posted by redjr View Post
That was it Jan. Once I connected the sense lines the voltages came down to 14.42 on both rails. Now to further raise the voltage to the desired 15v, I adjust the divider R6-R7 and R13-R14? Other thought?

Rick
No I think you're good to go.

Jan
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Old 25th May 2019, 03:37 PM   #1650
redjr is offline redjr  United States
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Originally Posted by jan.didden View Post
No I think you're good to go.

Jan
Okay. Thanks for your assistance.

Edit: Here's a pic of my finished board.
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File Type: jpg P1010083.jpg (641.3 KB, 127 views)
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Last edited by redjr; 25th May 2019 at 03:46 PM. Reason: Add image
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