Current-Sharing on the DOZ Amp

EchoWars · 2nd November 2004, 10:40 AM

Finishing up a headphone DOZ, and wanting to perhaps build a full-blown DOZ for driving speakers. However, I'd like to implement current-sharing, and parallel output devices.

With an amp like this, where should the resistors in the output stage be located? I had planned on using .15 ohm or .25 ohm resistors in the collectors like so:

(only one pair of outputs show, 'cause I'm too lazy to rebuild the whole thing in Visio at the moment, but you get the idea)

EchoWars · 2nd November 2004, 10:41 AM

Or should they go in the emitters?

Or one in the collector, and one in the emitter??

Fuling · 2nd November 2004, 11:00 AM

Like in the second picture, on the emitters.

Mattyo5 · 2nd November 2004, 11:11 AM

I used 8 output transistors per channel in an amp I built... i used the 2sc5200's from digikey...and i also used those transistors for the driver transistors b/c of the increased demand on the drivers. Turned out quite well. My final PS was 800va toroidal 40-0-40 that i used to get a 53-0 DC supply. Bias was set at 3 amps per channel. 300 watts of heat hehe

-Matthew K. Olson

destroyer X · 2nd November 2004, 11:38 AM

I like that idea.

Also can be used as a heater too

If you feel loneliness, this warm will be helpfull.

You have nothing related crazy.... class A sounds wonderfull.

regards,

Carlos

EchoWars · 2nd November 2004, 10:03 PM

Quote:

Originally posted by Fuling
Like in the second picture, on the emitters.

That simple huh??

Opinions on the resistor size? Should I use larger than 0.15 ohms? Maybe 0.22 or 0.25?

Mattyo5 · 2nd November 2004, 10:20 PM

Thats kinda the problem...i dont' remember what size. Probably .47 ohms is what i used...but i don't really remember hehe

-Matthew K. Olson

Upupa Epops · 2nd November 2004, 10:44 PM

Carlos, glaciers thaws. Sometimes in future will be class A amp crime

, remember on this and start envelope some in class D

. Whatabout some class A with ethylalcohol PS, 'cos you are living in Brazil

.

EchoWars · 3rd November 2004, 01:15 AM

Quote:

Originally posted by Mattyo5
Thats kinda the problem...i dont' remember what size. Probably .47 ohms is what i used...but i don't really remember hehe

-Matthew K. Olson

But you don't mention where you put the resistors...

Mattyo5 · 3rd November 2004, 01:20 AM

I think it was like what you had in the 2nd pic...but again, that dang memory of a 24 year old haha

-Matthew K. Olson

2nd November 2004, 11:38 AM	#5
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Hearing the best sound and cooking barbecues over heatsinks I like that idea. Also can be used as a heater too If you feel loneliness, this warm will be helpfull. You have nothing related crazy.... class A sounds wonderfull. regards, Carlos __________________ Try to build an amplifier folks ... it is pure adrenaline!.. when not work first time, then becomes a nice challenge...and we usually overcome the trouble... and we feel very well to be mastering the machine.

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2nd November 2004, 11:00 AM	#3
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	Like in the second picture, on the emitters.

2nd November 2004, 11:11 AM	#4
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	I used 8 output transistors per channel in an amp I built... i used the 2sc5200's from digikey...and i also used those transistors for the driver transistors b/c of the increased demand on the drivers. Turned out quite well. My final PS was 800va toroidal 40-0-40 that i used to get a 53-0 DC supply. Bias was set at 3 amps per channel. 300 watts of heat hehe -Matthew K. Olson

2nd November 2004, 10:20 PM	#7
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	Thats kinda the problem...i dont' remember what size. Probably .47 ohms is what i used...but i don't really remember hehe -Matthew K. Olson

2nd November 2004, 10:44 PM	#8
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Carlos, glaciers thaws. Sometimes in future will be class A amp crime , remember on this and start envelope some in class D . Whatabout some class A with ethylalcohol PS, 'cos you are living in Brazil .

3rd November 2004, 01:20 AM	#10
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	I think it was like what you had in the 2nd pic...but again, that dang memory of a 24 year old haha -Matthew K. Olson

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