french DIY amps

SDF · 18th June 2002, 07:22 AM

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.

Nelson Pass · 18th June 2002, 09:44 PM

Very nice, and note that it uses that scary current feedback.

Kilowatt · 19th June 2002, 02:03 AM

That's a really wierd amp. What's the THD? Quiescent current? etc. etc.?

trigon · 19th June 2002, 02:11 AM

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

Kilowatt · 19th June 2002, 02:16 AM

400mA quiescent I guess, nothing on distortion, but I can't read French.

trigon · 19th June 2002, 03:49 AM

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

promitheus · 19th June 2002, 06:56 AM

These current feedback amps are very good. This has also been used by Elektor magazine in a preamp and in an amp.

SDF · 19th June 2002, 09:24 AM

THD+noise < 0.05%.
Quiescent current is 200 mA per transistor, 400 mA for this circuit like precised Kilowatt.
With 2*20 000µF 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 1µH 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 50°C/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.

SDF · 19th June 2002, 10:02 AM

join new diagram.

19th June 2002, 09:24 AM	#8
SDF diyAudio Member Join Date: Jun 2002 Location: FRANCE	details THD+noise < 0.05%. Quiescent current is 200 mA per transistor, 400 mA for this circuit like precised Kilowatt. With 2*20 000µF 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 1µH 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 50°C/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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18th June 2002, 09:44 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	Very nice, and note that it uses that scary current feedback.

19th June 2002, 02:03 AM	#3
Kilowatt diyAudio Member Join Date: Nov 2001 Location: Harlowton, MT, USA	That's a really wierd amp. What's the THD? Quiescent current? etc. etc.?

19th June 2002, 02:16 AM	#5
Kilowatt diyAudio Member Join Date: Nov 2001 Location: Harlowton, MT, USA	400mA quiescent I guess, nothing on distortion, but I can't read French.

19th June 2002, 03:49 AM	#6
trigon diyAudio Member Join Date: May 2002 Location: Canada	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

19th June 2002, 06:56 AM	#7
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	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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