60 watt design...

rtill · 20th December 2007, 02:36 PM

Does this look like a good design for a power amp?
http://www.redcircuits.com/Page65.htm

jaycee · 20th December 2007, 03:10 PM

No.. it'd work, thats about all you can say about it.

There's some good circuits on Sam's page: http://users.otenet.gr/~athsam/index.htm

Or theres Rod Elliot's P3A: http://sound.westhost.com/project3a.htm

Or MikeB's SymAsym: http://www.lf-pro.net/mbittner/Sym5_.../symasym5.html

Or Destroyer X's amp: http://users.tpg.com.au/users/gerskine/dxamp/

The last two have PCB designs available which means you won't have to design one. Rod sells a PCB for his P3A amp.

sreten · 20th December 2007, 03:47 PM

Hi,

It is suitable for purpose, i.e. a guitar amplifier, but a very poor hi-fi amplifier.

/sreten.

rtill · 20th December 2007, 07:58 PM

is it possible to change the voltage and output transistors to get 150 watts?

MJL21193 · 20th December 2007, 10:26 PM

Quote:

Originally posted by rtill
is it possible to change the voltage and output transistors to get 150 watts?

Hi,
150+ watts here . Compare.

sakis · 21st December 2007, 12:16 PM

even think about it ....

jaycee · 21st December 2007, 09:58 PM

No. You cannot simply beef up the transistors and increase the voltage - the whole circuit needs to be designed for that. If you want a 150W amp, then go for a circuit designed for it.

rtill · 10th January 2008, 03:07 PM

so I built this amp 3 times with all new parts each time.....and R4 keeps starting on fire.....what's going on????

sakis · 10th January 2008, 03:16 PM

canot really help you since the data you provide is not enough .....

but if you like to have some other smoke producing devices i have a few to point for you .....

ONLY JOCKING !!!! BEST REGARDS SAKIS

Donk · 10th January 2008, 03:20 PM

R4 keeps starting on fire? Then there is something really really bad there!
Is Q2 still alive?

Plase provide us some meaurements as Sakis asked.
What is your rail current consumption? What's your output DC offset?
Any oscillation?
What PCB design did u use?
Etc..

20th December 2007, 02:36 PM	#1
rtill diyAudio Member Join Date: Sep 2006	60 watt design... Does this look like a good design for a power amp? http://www.redcircuits.com/Page65.htm

21st December 2007, 12:16 PM	#6
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	dont you ..... even think about it .... __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

10th January 2008, 03:07 PM	#8
rtill diyAudio Member Join Date: Sep 2006	fire fire fire so I built this amp 3 times with all new parts each time.....and R4 keeps starting on fire.....what's going on????

10th January 2008, 03:16 PM	#9
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	i am so sorry canot really help you since the data you provide is not enough ..... but if you like to have some other smoke producing devices i have a few to point for you ..... ONLY JOCKING !!!! BEST REGARDS SAKIS __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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20th December 2007, 03:10 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	No.. it'd work, thats about all you can say about it. There's some good circuits on Sam's page: http://users.otenet.gr/~athsam/index.htm Or theres Rod Elliot's P3A: http://sound.westhost.com/project3a.htm Or MikeB's SymAsym: http://www.lf-pro.net/mbittner/Sym5_.../symasym5.html Or Destroyer X's amp: http://users.tpg.com.au/users/gerskine/dxamp/ The last two have PCB designs available which means you won't have to design one. Rod sells a PCB for his P3A amp.

20th December 2007, 03:47 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, It is suitable for purpose, i.e. a guitar amplifier, but a very poor hi-fi amplifier. /sreten.

20th December 2007, 07:58 PM	#4
rtill diyAudio Member Join Date: Sep 2006	is it possible to change the voltage and output transistors to get 150 watts?

21st December 2007, 09:58 PM	#7
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	No. You cannot simply beef up the transistors and increase the voltage - the whole circuit needs to be designed for that. If you want a 150W amp, then go for a circuit designed for it.

10th January 2008, 03:20 PM	#10
Donk diyAudio Member Join Date: Sep 2007	R4 keeps starting on fire? Then there is something really really bad there! Is Q2 still alive? Plase provide us some meaurements as Sakis asked. What is your rail current consumption? What's your output DC offset? Any oscillation? What PCB design did u use? Etc..

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