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Old 4th May 2011, 07:11 PM   #1
Boscoe is offline Boscoe  United Kingdom
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Default A few questions on this amp design...

Just wondered if some people could help me out. I want to do this sort of amp design as it isn't too complex but I only have 2SA1492 and 2SC3856 and I don't want to buy any others so would they be compatible? If not could someone suggest something?

Secondly can someone suggest a cheap and easy program to design the PCB for this?

Thanks.
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Old 4th May 2011, 07:42 PM   #2
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Its hard to get help without these: schematic? power? speaker impedance?
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Old 4th May 2011, 07:59 PM   #3
Boscoe is offline Boscoe  United Kingdom
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Haha sorry forgot to put the link in!

HERE is the link to the design!

Speakers are 8ohm I would like about 100W

Also like to know if I can increase the amount of output devices?
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Old 4th May 2011, 08:07 PM   #4
lineup is offline lineup  Sweden
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yes. that's a good design.
And there are several options of power transistors.
I am sure your transistors will work, too.
And there are instructions how to put it together.

If you like you can order nice PCB boards from ESP Rod Elliott
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Old 4th May 2011, 08:54 PM   #5
Boofers is offline Boofers  Canada
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PCB123 and ExpressPCB are free PCB design programs. Once you design your board you can use these programs to order your boards, and they will manufacture them and ship them to you. Or you can do what I do and just use the program and make your own boards.
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Old 4th May 2011, 09:15 PM   #6
Boscoe is offline Boscoe  United Kingdom
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Okay thanks but I want to know for definite whether these transistors will work though.

And yes I would rather order the PCBs from Rod Elliot but I want two pairs of output devices without bodges!

Thanks
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Old 5th May 2011, 07:04 AM   #7
lineup is offline lineup  Sweden
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I searched: 2SC3856 replacement
with google.
MJL4281/MJL1302 should be good replaments.
So, I say you can be sure that you can use those in Rod Elliott project
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Old 5th May 2011, 09:14 AM   #8
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As long as you don't exceed the devices' SOA,you are good to go.
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Old 5th May 2011, 09:21 AM   #9
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Quote:
Originally Posted by Boscoe View Post
Haha sorry forgot to put the link in!

HERE is the link to the design!

Speakers are 8ohm I would like about 100W

Also like to know if I can increase the amount of output devices?
I used MJL21193/21194 for my P3A and they worked fine. Right now I am rebuilding it with 2SC5200/2SA1943 which have a very low output capacitance(200pF).

With 2 pairs of transistors and +/- 42V, the amp can deliver 100W into 8Ohms. Do not use 4 Ohm speakers with this voltage.

For higher power, look at Rod's P101 mosfet amplifier.
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