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Old 18th June 2002, 07:22 AM   #1
SDF is offline SDF  France
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Thumbs up french DIY amps

Create by JM plantefeve, this amp has very good sonic and the schematic is very simple.

Maximum value +- 65V give more 170W RMS in 8Ohms.
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Old 18th June 2002, 09:44 PM   #2
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Very nice, and note that it uses that scary current feedback.
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Old 19th June 2002, 02:03 AM   #3
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That's a really wierd amp. What's the THD? Quiescent current? etc. etc.?
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Old 19th June 2002, 02:11 AM   #4
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Quote:
Originally posted by Kilowatt
That's a really wierd amp. What's the THD? Quiescent current? etc. etc.?
Kilowatt.

Try this link.

http://perso.wanadoo.fr/jm.plantefeve/sche.html
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Old 19th June 2002, 02:16 AM   #5
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400mA quiescent I guess, nothing on distortion, but I can't read French.
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Old 19th June 2002, 03:49 AM   #6
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Use this web link

http://babel.altavista.com/

then paste the original link of the web and select from French to English.

Hope this help
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Old 19th June 2002, 06:56 AM   #7
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These current feedback amps are very good. This has also been used by Elektor magazine in a preamp and in an amp.
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Old 19th June 2002, 09:24 AM   #8
SDF is offline SDF  France
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Default details

THD+noise < 0.05%.
Quiescent current is 200 mA per transistor, 400 mA for this circuit like precised Kilowatt.
With 2*20 000F by chanel, it's a good supply.

If you make this amplifier some modification should be add in a target to not have problems with the FETs input stage.

With this diagram, if it uses with CD player, you don't really need
preamp.

Add 470 Ohms resistor in serial with input, make an inductor about 1H at the output. (10 turns).
BUZ 900 and 905 (DP always) have not same Crss, capacitor
between gate and drain, so a 39pF should be add between gate and drain of each BUZ 900DP (Ntype).

More, 2N.... are mounting with 50C/w dissipator (or less of course).

Two last word concerning ELEKTOR amps. They are good amps but the sound is not as soon as good like they electrical features.
I talk about Hexfet 60, nonante and the discret. Otherwise, the LFA 150 is very very good.

Bye.

Special thanks to Sear Pass.
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Old 19th June 2002, 10:02 AM   #9
SDF is offline SDF  France
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Default modified diagram

join new diagram.
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