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Old 25th May 2004, 12:15 PM   #1
benmanf is offline benmanf  Israel
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Lightbulb what can i use...

I want to build my first amp...
i think i gonna build the p3a...

what transistors can i use for the p3a instead of:
MJE15034
MJE15035
MJL4302
BC546
MJL4281

or maybe i cant?
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Old 25th May 2004, 01:20 PM   #2
jaycee is online now jaycee  United Kingdom
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BD139/140 instead of MJE15034/MJE15035, TIP29/30 should also work.

MJ15003/4 instead of MJL4281/4302, although any suitable power stage transistor should also work.

Pretty much any small signal transistor with Ic>=100mA, Vceo >= 65V and Vcbo>=80V, low noise ones are best, 2N5551 will work.

If you are making your own PCB you can customise it to pretty much anything you can get hold of. If you're planning to buy Rod's PCB you may be a bit restricted though to transistors having same or similar pinouts.
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Old 25th May 2004, 01:29 PM   #3
benmanf is offline benmanf  Israel
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Default thank you!! and....

another question:

i have 12V and 24V transformers

can i connect them somehow and get 36V ?
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Old 25th May 2004, 04:26 PM   #4
sss is offline sss  Israel
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i think using only 24V transformer will be enough - after the rectifiers the voltage will be approx 33V
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Old 25th May 2004, 04:30 PM   #5
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There are probably very many transistors you could use.
The question is rather what you can buy easily where you live
and that can be used instead, if the "real" ones are difficult to
get for you.
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Old 25th May 2004, 09:29 PM   #6
jaycee is online now jaycee  United Kingdom
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24V transformer will work best, what is more important is the VA rating of the transformer, under 120VA is not really going to provide satisfactory performance for one channel. 250VA-300VA is recommended for a stereo pair of these amps.
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Old 26th May 2004, 07:31 AM   #7
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Default Jaycee transistor choice is very good

I think its a good choise, will work very well.

Carlos
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Old 26th May 2004, 09:07 AM   #8
benmanf is offline benmanf  Israel
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THANK YOU ALL!!!

NOW I HAVE MORE CHANCES TO FIND THE PARTS I NEED

AND I DONT NEED TO BUY A NEW TRANSFORMER...
(MY 24v IS VERY POWERFUL)
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