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-   -   Little fet preamp (http://www.diyaudio.com/forums/solid-state/35494-little-fet-preamp.html)

00940 5th June 2004 10:09 PM

Little fet preamp
 
I found this little preamp on this website : http://michel.burdin.online.fr/zen.htm#PAFET

http://membres.lycos.fr/sst00940/preamp2.jpg

it's a slightly modified version of a preamp published in "la nouvelle electronique n2". Author claims that performance is close to a BOZ. Consumption is about 100mA for both channels.

Any comment on this one ? I'm planning to put it inside a philips cd753, to get a decent variable output.

Richard C 5th June 2004 10:22 PM

it ain't rocket science...
 
Looks like it's designed for a certain sound due to its relatively bendy transfer characteristic.:) Might sound 'nice' though.

00940 6th June 2004 07:08 AM

You see any way to improve it ?

I've been adviced on another board to scrap C21 and C22

00940 6th June 2004 08:05 AM

allright, I've been also told the contrary with better arguments :D

Richard C 6th June 2004 11:50 AM

Yes, you certainly need those coupling caps.

Improvements; well not really, it is what it is. If you want better linearity then an entirely different design is required.

If you do build it make sure you use a well regulated power supply.

Devil_H@ck 6th June 2004 04:36 PM

This might be a stupid question, but don't you need a negative supply voltage too?

Richard C 6th June 2004 04:50 PM

C36 enables both negative and positive output voltage swing from a single rail supply.

Devil_H@ck 6th June 2004 05:05 PM

Ah, ok, thanks :)!


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