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Old 30th April 2011, 02:36 AM   #1
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Default DC supply for amplifier

Folk
I am looking at building a simple ampllifier from basics. I want it to be about 20-25w, with tone controls
I have been looking at the LM1876 as the power amp stage, with the LM1036 for the controller
The thing I note is the optimal power input for the LM1876 is +-25v, with the lm1036 is at +-9-16v
Can ayone guide me to a power supply setup that is suitable, or a more suitable starting point?
Aim is for a bedroom system so not looking at high power
Best wishes
Douglas Ramsay
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Old 30th April 2011, 04:33 AM   #2
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Single Chip 25W Amplifier (Project 72)

Add a couple of regulators for the lower voltage.
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Old 30th April 2011, 05:27 AM   #3
CBS240 is offline CBS240  United States
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Hi

According to the LM1036 datasheet, it only requires single end Vcc, 9-16V. So 12V 50mA limit should suffice. A LM317 would probably work fine but here is another simple approach...4092 and 4117 J-fets, 4117 has Idss ~50uA. BC517 is a Darlington with DC beta of ~60,000 @ 50mA.



PS, I don't like using Zener voltage references in a PS...they're noisy. J-fets are much better.

PSS, If you are winding your own power transformer you could simply include another secondary winding, would be more efficient.
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Old 30th April 2011, 06:55 AM   #4
lineup is offline lineup  Sweden
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Nice 12V regulator, CBS240
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Old 30th April 2011, 12:19 PM   #5
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Thanks folk for the input, I will do a layout and post it as well - I will probabbly buy the transformer as there is a specialist company locally - though if I find a nice core who knows
Greg, I saw your project 72, which led me to the LM1876, being a dual channel chip- will be interesting to see how things turn out
as I am just starting out it should be fun

I also found an interesting layout for an ipod interface which I will be including as well
Best wishes
Douglas
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