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Regulated Split Rail Supply Sagging
Regulated Split Rail Supply Sagging
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Old 8th January 2020, 07:55 PM   #11
Puffin is offline Puffin  United Kingdom
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Quote:
Originally Posted by Osvaldo de Banfield View Post
I didn't doubt in your skills nor that the circuit will not work, I only say that simple things usually do its job better than complex solutions.
No, I didn't read it that way. I should not look at the parts count on the stuff on ebay and think it is good value for what the parts would cost me to make it myself.
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Old 8th January 2020, 08:06 PM   #12
leadbelly is online now leadbelly  Canada
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Well, the transformer looks decent sized, so the most likely reason is the preamp draws more than the 125 mA the current limiter is set to. As Jan says, measure at different points in the circuit.
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Old 9th January 2020, 11:38 AM   #13
Puffin is offline Puffin  United Kingdom
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I am thinking of ditching the current limiting and modifying the board. In the past I have had success with adding a power transistor to the circuit to boost the current as in the link below.

https://www.eeweb.com/extreme-circui...ooster-circuit
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Old 9th January 2020, 05:49 PM   #14
Puffin is offline Puffin  United Kingdom
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UPDATE: Whilst checking the current draw at different points on the board I seem to have killed something! Oh well, I should have made it myself anyway.....which is what I will do now
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Old 9th January 2020, 05:55 PM   #15
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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It happens frequently. When searching with the DMM test leads in an IC, for example, and move the vision to DMM's display, the points move itself or by an error in hand movements, and pufff: the thing makes smoke by it 4 sides.
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