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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 Yesterday, 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 Yesterday, 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; Yesterday at 12:14 PM.
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Old Yesterday, 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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