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Author Topic: Improved 'Guitar Handbook' TL071 preamp  (Read 28759 times)

lefizz

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Re: Improved 'Guitar Handbook' TL071 preamp
« Reply #30 on: November 01, 2007, 06:48:40 AM »
I change input settign resistor int he second stage (r15) from 1m to 50k. This seems to have clear the sound up a lot, more test to follow tonight.

lefizz

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Re: Improved 'Guitar Handbook' TL071 preamp
« Reply #31 on: November 01, 2007, 06:21:25 PM »
My amp is still pumping at high gain levels. Could this be because i haven't got enough capacitance on the preamp board? i have eliminated the speakers, tried a hifi one and got the same effect, replaced the 25watts class-t with a 100 watt board. And removed the mixer amp temporarily. The only thing the same as the first test is the preamp so i guess this is where the issue originates. At the moment the virtual ground is only decoupled with 1uf and the 25v to gnd with 10uf? I think i might put some decent 100uf in both locactions to see what happens.

lefizz

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Re: Improved 'Guitar Handbook' TL071 preamp
« Reply #32 on: November 03, 2007, 10:12:09 AM »
Thats completly fixed the preamp,to little capacitance between the virtual ground and 0v, sound great and totally stable at any gain setting.
I am so happy!!

The 100 watt class-D really gives this setup a hell of a kick. Utterly deafening in a flat, my neighbours must be getting a little annoyed. Thanks for all the input guys, even though this thread has turned into a bit of a monologue of late.