Power Amp Board Identification

sidsparks · 14th February 2009, 03:07 PM

Does anyone recognise this power board, if so do they have a schematic that they could post or e-mail.

Thanks

djk · 15th February 2009, 04:34 AM

Sorry, don't recognize it.

It does look interesting though. Three pair of MJ12522/23 outputs, one pair of the same for drivers. LDR limiter. Has been very poorly repaired at least once.

You could probably draw the schematic easily enough.

Looks to be about 400W/4R, running on about ±75V or so.

poynton · 15th February 2009, 05:55 AM

Is the label " The Hunter", the only marking ??

Andy

djk · 15th February 2009, 10:12 AM

" The Hunter"

Probably the guy that stuffed the board.

There is a similar "DC Test" sticker on the bottom left, another name on it.

jaycee · 15th February 2009, 11:16 AM

Well, whatever it is, it has totally had it.. PCB burnt in places, diodes fried, poor mounting of parts, those power supply capacitors look like they're past it too. Also as djk says, it's been very badly repaired at some point - probably why it has blown up.

Find out what the power supply voltages are and make something to replace it. There's going to be no repairing that without making a new PCB.

darkfenriz · 15th February 2009, 11:24 AM

Quote:

Originally posted by djk
LDR limiter

Where?

jaycee · 15th February 2009, 11:26 AM

Quote:

Originally posted by darkfenriz
Where?

If i was to take a guess, I would say it's that part to the right of the DIL8 chip on the board, in the first picture.

Steve Dunlap · 15th February 2009, 11:54 AM

That looks like a QSC from the early 80s. The board is all you have?

llwhtt · 15th February 2009, 05:24 PM

That's the power supply/amp board for a Crate PCM 6/8 powered mixer from the mid/late 80s.
I have the schematics and layouts in from of me, too large to scan though.

Craig

llwhtt · 15th February 2009, 06:22 PM

Sidsparks,

I have the schematic and layout scanned and ready to go, need your email.

Craig

14th February 2009, 03:07 PM	#1
sidsparks diyAudio Member Join Date: Jan 2008	Power Amp Board Identification Does anyone recognise this power board, if so do they have a schematic that they could post or e-mail. Thanks

15th February 2009, 04:34 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	Sorry, don't recognize it. It does look interesting though. Three pair of MJ12522/23 outputs, one pair of the same for drivers. LDR limiter. Has been very poorly repaired at least once. You could probably draw the schematic easily enough. Looks to be about 400W/4R, running on about ±75V or so. __________________ Candidates for the Darwin Award should not read this author.

15th February 2009, 05:55 AM	#3
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Is the label " The Hunter", the only marking ?? Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

15th February 2009, 10:12 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	" The Hunter" Probably the guy that stuffed the board. There is a similar "DC Test" sticker on the bottom left, another name on it. __________________ Candidates for the Darwin Award should not read this author.

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15th February 2009, 11:16 AM	#5
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Well, whatever it is, it has totally had it.. PCB burnt in places, diodes fried, poor mounting of parts, those power supply capacitors look like they're past it too. Also as djk says, it's been very badly repaired at some point - probably why it has blown up. Find out what the power supply voltages are and make something to replace it. There's going to be no repairing that without making a new PCB.

15th February 2009, 11:54 AM	#8
Steve Dunlap diyAudio Member Join Date: Sep 2008 Location: Here	That looks like a QSC from the early 80s. The board is all you have?

15th February 2009, 05:24 PM	#9
llwhtt diyAudio Member Join Date: Jun 2008	That's the power supply/amp board for a Crate PCM 6/8 powered mixer from the mid/late 80s. I have the schematics and layouts in from of me, too large to scan though. Craig

15th February 2009, 06:22 PM	#10
llwhtt diyAudio Member Join Date: Jun 2008	Sidsparks, I have the schematic and layout scanned and ready to go, need your email. Craig

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