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Old 5th June 2004, 10:09 PM   #1
00940 is offline 00940  Belgium
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Default Little fet preamp

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

Click the image to open in full size.

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.
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Old 5th June 2004, 10:22 PM   #2
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Default 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.
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Old 6th June 2004, 07:08 AM   #3
00940 is offline 00940  Belgium
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You see any way to improve it ?

I've been adviced on another board to scrap C21 and C22
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Old 6th June 2004, 08:05 AM   #4
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allright, I've been also told the contrary with better arguments
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Old 6th June 2004, 11:50 AM   #5
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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.
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Old 6th June 2004, 04:36 PM   #6
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This might be a stupid question, but don't you need a negative supply voltage too?
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Old 6th June 2004, 04:50 PM   #7
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C36 enables both negative and positive output voltage swing from a single rail supply.
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Old 6th June 2004, 05:05 PM   #8
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Ah, ok, thanks !
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