5532 preamp help

enter · 28th July 2005, 01:17 PM

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

Leolabs · 29th July 2005, 02:53 AM

I am not familiar with the second stage,any description???Looks like some sort of limiter.

wrenchone · 29th July 2005, 03:10 AM

The + input of the first amp needs to be grounded via some impedance, say, a 47k resistor .

enter · 29th July 2005, 01:46 PM

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.

tschrama · 29th July 2005, 02:24 PM

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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29th July 2005, 02:53 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	I am not familiar with the second stage,any description???Looks like some sort of limiter.

29th July 2005, 03:10 AM	#3
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	The + input of the first amp needs to be grounded via some impedance, say, a 47k resistor .

29th July 2005, 01:46 PM	#4
enter diyAudio Member Join Date: Jun 2005 Location: Athens	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.

29th July 2005, 02:24 PM	#5
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	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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