Designs for 2SC3281 and 2SA1302?

Boscoe · 23rd October 2010, 03:30 PM

I have 3 pairs and want to make 3 single channel amps out of them, has anyone got a diagram? What sort of power would I get out of one pair?

Thanks
Boscoe

AndrewT · 23rd October 2010, 05:05 PM

These devices have been obsolete for a long time.
The only versions still advertised are Fakes.

Even the replacement 2sa1943/c5200 are copied and Faked and thus can rarely be relied on to be genuine.

Boscoe · 06:14 PM

So thats why i struggled to find any designs on them, would the designs for these fakes be all good for the ones i have?

EDIT- I have found THIS are the components the same for my transistors?

Bone · 23rd October 2010, 07:09 PM

The original P3a by ESP used those transistors and gave out 100watts in 4 ohms. If you are sure yours are not fakes then why not try his circuit. See: < 60-80W Power Amplifier >. He also sells you PCBs if you want them. They have 2 circuits on one board but can be cut in half.
BTW your link in your edit, doesnt work.
Tony

Boscoe · 08:22 PM

Quote:

Originally Posted by Bone

The original P3a by ESP used those transistors and gave out 100watts in 4 ohms. If you are sure yours are not fakes then why not try his circuit. See: < 60-80W Power Amplifier >. He also sells you PCBs if you want them. They have 2 circuits on one board but can be cut in half.
BTW your link in your edit, doesnt work.
Tony

Thanks for this but how do I 'cut it in half' Just take two of the transistors out, what about other components and values, do they need to be changed?

Also the link you gave it says 60W continuous into 8ohm but with my link 100W is supposed to be acheivable is this because of superior trasistors?

For some reason I can't edit my post THIS is the link.

Leon08 · 23rd October 2010, 08:25 PM

You can use them in any design or MJE1302 and MJE3281 wich are equivalents.
I've build my amplifier using this transistors and can only recomend them to other people.They make good bass response.

Bigun · 23rd October 2010, 08:42 PM

I don't see why they couldn't be used in Carlos' DX amplifier designs that are popular on this forum.

ostripper · 23rd October 2010, 09:58 PM

Both my AX/BX/GX amps use these or any ON semi clone. VERY durable circuits. The NJW0281/0302 pair are $1.40USD apiece. I get lots of 25 for $26 ($1.04 each). This makes hunting down fakes kind of silly.

At my site below in the "mongrel" folder is AX/BX and a 60w/120w/250w power board to go with them.

OS

Boscoe · 24th October 2010, 03:33 PM

Quote:

I don't see why they couldn't be used in Carlos' DX amplifier designs that are popular on this forum.

has anyone got the link for this? Thanks for the feedback people.

coolet · 24th October 2010, 03:55 PM

Quote:

Originally Posted by Boscoe

has anyone got the link for this? Thanks for the feedback people.

Here

23rd October 2010, 03:30 PM	#1
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	Designs for 2SC3281 and 2SA1302? I have 3 pairs and want to make 3 single channel amps out of them, has anyone got a diagram? What sort of power would I get out of one pair? Thanks Boscoe

23rd October 2010, 05:05 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	These devices have been obsolete for a long time. The only versions still advertised are Fakes. Even the replacement 2sa1943/c5200 are copied and Faked and thus can rarely be relied on to be genuine. __________________ regards Andrew T.

23rd October 2010, 05:57 PM	#3
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	So thats why i struggled to find any designs on them, would the designs for these fakes be all good for the ones i have? EDIT- I have found THIS are the components the same for my transistors? Last edited by Boscoe; 23rd October 2010 at 06:14 PM.

23rd October 2010, 08:42 PM	#7
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	I don't see why they couldn't be used in Carlos' DX amplifier designs that are popular on this forum. __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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23rd October 2010, 07:09 PM	#4
Bone diyAudio Member Join Date: Jun 2004 Location: Dorset, UK	The original P3a by ESP used those transistors and gave out 100watts in 4 ohms. If you are sure yours are not fakes then why not try his circuit. See: < 60-80W Power Amplifier >. He also sells you PCBs if you want them. They have 2 circuits on one board but can be cut in half. BTW your link in your edit, doesnt work. Tony

23rd October 2010, 08:25 PM	#6
Leon08 Banned Join Date: Sep 2010 Location: at Home	You can use them in any design or MJE1302 and MJE3281 wich are equivalents. I've build my amplifier using this transistors and can only recomend them to other people.They make good bass response.

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