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Old 20th December 2007, 02:36 PM   #1
rtill is offline rtill  United States
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Default 60 watt design...

Does this look like a good design for a power amp?
http://www.redcircuits.com/Page65.htm
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Old 20th December 2007, 03:10 PM   #2
jaycee is offline jaycee  United Kingdom
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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.
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Old 20th December 2007, 03:47 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

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

/sreten.
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Old 20th December 2007, 07:58 PM   #4
rtill is offline rtill  United States
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is it possible to change the voltage and output transistors to get 150 watts?
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Old 20th December 2007, 10:26 PM   #5
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Quote:
Originally posted by rtill
is it possible to change the voltage and output transistors to get 150 watts?

Hi,
150+ watts here . Compare.
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Old 21st December 2007, 12:16 PM   #6
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Default dont you .....

even think about it ....
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Old 21st December 2007, 09:58 PM   #7
jaycee is offline jaycee  United Kingdom
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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.
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Old 10th January 2008, 03:07 PM   #8
rtill is offline rtill  United States
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Default 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????
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Old 10th January 2008, 03:16 PM   #9
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Default 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
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Old 10th January 2008, 03:20 PM   #10
Donk is offline Donk  Europe
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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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