Usage of BUZ71A ??

SM7UYJ · 25th December 2005, 09:28 AM

Hi,
This summer I got hold of a large quantaty of BUZ71A MosFets at a local flea market (500+).
When I bought them, I planed to use them as DC-switches in RF-equipment.
For fun I built a headphone amplifier and it sounded quite nice!
Has anyone used them in "normal" amplifiers or have any sugestions what to build (audio) with them ?

I have some large heatsink just waiting to be used, så a class A amp. would be ideal!

/Roger

Tekko · 25th December 2005, 09:36 AM

What about a SoZ (Son of Zen) amplifier ?

SM7UYJ · 26th December 2005, 12:36 PM

Hi,
Abt SOZ:

As the BUZ71As are Vdss 50V, Rds <0.12Ohm, Id 13A, Ptot 40W I was thinking something a bit more efficiant as I'll otherwise have to use quite alot of them to get ~10W output (...not that I don't have enough of them, just seems that transistors with higher Pdiss. would be better suited

)

/R

Tekko · 26th December 2005, 12:51 PM

Get some complements to them and u can build a mosfet poweramp.

Tekko · 26th December 2005, 12:54 PM

If you plan to sell some of them i can take about 100 of them.

Samuel Jayaraj · 26th December 2005, 01:13 PM

Just reduce the rail voltages and build either Anthony Holton's N-channel amp or Lars' N-channel amp. Search or ask on this forum and you will have access to these schematics.

DigitalJunkie · 27th December 2005, 10:40 AM

I've seen them used in the SMPS of a few car amplifiers.

Actually,I could use a few "spares" myself...

SM7UYJ · 27th December 2005, 08:53 PM

Tnx for the suggestions!
I'll try and se how it goes.

I'm not planing on selling of most of them, but if someone has ideas of how to use them, I'll be happy to send some "samples" for the price I payed + p&p.

I think I'm going to try and build a BOZ with them in this case I made today. Running ~24-30V DC.

Is it worth spending the time?

/R

quasi · 28th December 2005, 05:18 AM

The BUZ71's are limited to supply rails of +/- 25 volts max without any safety margin.

You could build a quality class A or AB amplifier in quasi-complementary style of around 25 watts into 8 ohms.

Cheers

25th December 2005, 09:28 AM	#1
SM7UYJ diyAudio Member Join Date: Dec 2004 Location: Staffanstorp	Usage of BUZ71A ?? Hi, This summer I got hold of a large quantaty of BUZ71A MosFets at a local flea market (500+). When I bought them, I planed to use them as DC-switches in RF-equipment. For fun I built a headphone amplifier and it sounded quite nice! Has anyone used them in "normal" amplifiers or have any sugestions what to build (audio) with them ? I have some large heatsink just waiting to be used, så a class A amp. would be ideal! /Roger __________________ The probability of someone watching you is proportional to the stupidity of your action. - A. Kindsvater

26th December 2005, 12:36 PM	#3
SM7UYJ diyAudio Member Join Date: Dec 2004 Location: Staffanstorp	Hi, Abt SOZ: As the BUZ71As are Vdss 50V, Rds <0.12Ohm, Id 13A, Ptot 40W I was thinking something a bit more efficiant as I'll otherwise have to use quite alot of them to get ~10W output (...not that I don't have enough of them, just seems that transistors with higher Pdiss. would be better suited ) /R __________________ The probability of someone watching you is proportional to the stupidity of your action. - A. Kindsvater

26th December 2005, 01:13 PM	#6
Samuel Jayaraj diyAudio Member Join Date: May 2001 Location: Bangalore, India	Just reduce the rail voltages and build either Anthony Holton's N-channel amp or Lars' N-channel amp. Search or ask on this forum and you will have access to these schematics. __________________ Sam

28th December 2005, 05:18 AM	#9
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	The BUZ71's are limited to supply rails of +/- 25 volts max without any safety margin. You could build a quality class A or AB amplifier in quasi-complementary style of around 25 watts into 8 ohms. Cheers __________________ http://sites.google.com/site/quasisdiyaudiosite/

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25th December 2005, 09:36 AM	#2
Tekko diyAudio Member Join Date: Jan 2005	What about a SoZ (Son of Zen) amplifier ?

26th December 2005, 12:51 PM	#4
Tekko diyAudio Member Join Date: Jan 2005	Get some complements to them and u can build a mosfet poweramp.

26th December 2005, 12:54 PM	#5
Tekko diyAudio Member Join Date: Jan 2005	If you plan to sell some of them i can take about 100 of them.

27th December 2005, 10:40 AM	#7
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	I've seen them used in the SMPS of a few car amplifiers. Actually,I could use a few "spares" myself...

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