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Old 28th July 2005, 01:17 PM   #1
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Question 5532 preamp help

Hi to everybody. I made this little preamp to use with TDA2040 as a guitar amp but the preamp dosent work.Has enybody try it or can tell me if it can work by the schematic???
Thanks
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Old 29th July 2005, 02:53 AM   #2
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I am not familiar with the second stage,any description???Looks like some sort of limiter.
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Old 29th July 2005, 03:10 AM   #3
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The + input of the first amp needs to be grounded via some impedance, say, a 47k resistor .
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Old 29th July 2005, 01:46 PM   #4
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Thanks for replying
The only thing i know is that the tone controls at the second stage is from Elliot project 27.
I will try to ground the +input with a resistor and replay you soon
Thanks again.
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Old 29th July 2005, 02:24 PM   #5
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1st opamp:
Series cap at input say 1uF, after that 100K to ground

2nd opamp:
Series cap at input say 10uF, after that 10K to ground

A 100K (?) resistor parralel with D1/D2 ..
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