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Old 24th November 2012, 11:53 PM   #11
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I tried to bypass the regulator and that still does not work. I bypassed the pre-amp to make sure my source and amp were working and everything is good. I also checked my supply voltage and its perfect.

Hopefully there is some way??

Or I guess I need to find another solution. I need a small pre-amp for my amplifier.

MP
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Old 25th November 2012, 05:15 AM   #12
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You must be doing something wrong, or something is being overlooked by someone.

I took another look at the preamp board - bridge rectifier, feeding the 78L12 and 79L12 regs, powering the single DIP8 op amp package. Sorry, but my money's on the former.
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Old 25th November 2012, 09:25 AM   #13
AndrewT is offline AndrewT  Scotland
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blown opamp due to error in trying to connect the wrong PSU at the start.
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Old 25th November 2012, 06:41 PM   #14
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Quote:
Originally Posted by sofaspud View Post
You must be doing something wrong, or something is being overlooked by someone.

I took another look at the preamp board - bridge rectifier, feeding the 78L12 and 79L12 regs, powering the single DIP8 op amp package. Sorry, but my money's on the former.

Sofaspud,

Are you saying it should work with DC power supply? Or do you think its possible that I blew the op amp like AndrewT says?

Mike
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Old 25th November 2012, 08:31 PM   #15
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It is made to work with DC. This mod was only providing the DC differently.
It may be possible. I don't know what you've hooked up to the circuit trying to get it to work.
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