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Old 23rd June 2019, 04:42 PM   #1701
jan.didden is offline jan.didden  Europe
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OK, that's progress! I think I gave enough pointers for you to complete it. Especially see the post about the opamp pin voltages.
Also, try to follow from opamp output to base of pass transistor.
And remember: if you have a problem with something that has been build 100's of times with no issue, it's a safe bet that you made a mistake. ;-)
Assume that a moron (just assume!) build up the board and double check accordingly!

It might also pay to read the article linked at the diyaudio store.

Jan
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Last edited by jan.didden; 23rd June 2019 at 04:45 PM.
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Old 23rd June 2019, 05:13 PM   #1702
Dirk1 is offline Dirk1  Germany
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Thank you for your help. I will check everything again.

Dirk
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Old 23rd June 2019, 05:53 PM   #1703
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by Dirk1 View Post
Thank you for your help. I will check everything again.

Dirk
And measure. If you look at the circuit and read the article, and reason about the voltages expected, then measure, gives you a quick clue. It isn't that hard.
So much more rewarding than blindly substituting and hoping you catch it.

Jan
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Old 23rd June 2019, 10:07 PM   #1704
IanAS is offline IanAS  England
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If D5 = LM4040AIZ 2.5V.

R6 should be 1k.

Not linked out.
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Old 24th June 2019, 06:24 AM   #1705
jan.didden is offline jan.didden  Europe
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Yes. But the output was 10V.

Jan
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Old 24th June 2019, 12:11 PM   #1706
IanAS is offline IanAS  England
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Quote:
Originally Posted by Dirk1 View Post
I wanted to build a super regulator with 5 volts output, after post 535.
Oh, sorry if misunderstood, was the target voltage is intended to be 10V? Or have I misread something else?

Jan, I read though your notes at https://linearaudio.nl/sites/lineara...reg%20V2.3.pdf and there's no mention of maintaining the regulator output at a minimum of 100mA by using a resistor to earth at the output to 'top up' the quiescent current of the load (if the load is less than 100mA), which I seem to be recall reading somewhere, maybe in the copy of Walts magazine articles, or earlier in this lengthy thread.

Would a further refinement (2.4?) of the schematic / layout, be to have space for such a resistor and two holes on the PCB? Or is better regulation achieved by locating the resistor at the load?

Last edited by IanAS; 24th June 2019 at 12:14 PM.
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Old 24th June 2019, 12:30 PM   #1707
jan.didden is offline jan.didden  Europe
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I don't know where that comes from, certainly not from me. There's no minimum external load required.

Jan
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Old 29th June 2019, 04:08 PM   #1708
Dirk1 is offline Dirk1  Germany
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Thanks again for your help.

5V regulator is running.

D5 = LM4040AIZ 2.5V.
R7 = 1K.
R6 = bridge.
D2 = 2 red LED.
R5 = 4.99.
R2 = 10K.

Result 5.007V even under load stable 400mA.

I had the LM4040AIZ 5V installed first.

Dirk
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Old 29th June 2019, 04:20 PM   #1709
ticknpop is offline ticknpop  Canada
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Super Regulator
For 5 volts out, use Walt’s Gled 2.5 Volt voltage reference, but decrease the series resistor to get at least 8 ma ( R5 becomes 120 ohms on the positive regulator, R12 for the negative) through it for best noise performance and pot it in silicon to get the thermal drift to a minimum

Last edited by ticknpop; 29th June 2019 at 04:26 PM.
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Old 29th June 2019, 04:21 PM   #1710
jan.didden is offline jan.didden  Europe
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Well done!
Debugging something you build yourself is actually one of the hardest things ever, because you are sure you did it right!
Especially if you don't have much experience with such things, you start to suspect and replace all kinds of parts, sometimes making it worse.
Just letting it sit for a day and then go over it in detail generally makes you find the issue, but who can do that once the project is finally finished

Jan
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