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Old 10th December 2007, 01:31 PM   #1
Khron is offline Khron  Romania
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Default JLH amp pcb

Greetings everyone...

I'm keen on building a pair of (updated) JLH amps to drive the tweeters in my bi-amped system. I've devised a pcb for them, and i'm currently seeking validation and maybe some tips for improving the layout.

The schematic can be found at this site .

I'm attaching the current layout here.
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Old 10th December 2007, 01:54 PM   #2
jmateus is offline jmateus  United States
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Default JLH amp

Nice PCB
What kind of outputs are you considering for this design?
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JLH 2005, Cyrus and so on...
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Old 10th December 2007, 02:00 PM   #3
Khron is offline Khron  Romania
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Following some recommendations from that site, i was considering MJL21194's. It's said to oscillate if faster devices are used.

PS: another reason is that i can source some as samples from OnSemi
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Old 10th December 2007, 03:15 PM   #4
pilli is offline pilli  France
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Have you already seen this site?

http://members.shaw.ca/paul.r.brown/...%20Moss%20JLH/


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Old 10th December 2007, 03:27 PM   #5
Khron is offline Khron  Romania
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I think i stumbled upon that page sometime, but the board is quite big. It says somewhere that the board is 160x100mm. Mine is about 1/4 that size (around 85x50mm), and in don't really have any huge cases available at the moment
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Old 10th December 2007, 03:36 PM   #6
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Default Re: JLH amp pcb

Quote:
Originally posted by Khron
Greetings everyone...

I'm keen on building a pair of (updated) JLH amps to drive the tweeters in my bi-amped system. I've devised a pcb for them, and i'm currently seeking validation and maybe some tips for improving the layout.

The schematic can be found at this site .

I'm attaching the current layout here.
Personally, I would move the caps to the other side of the power transistors so that the feedback path is much shorter.

Kind regards
Nico
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Old 10th December 2007, 03:42 PM   #7
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If you are going to use it for your tweeters only, why need to double up on the power transistors, one pair would be more than adequate for 10 watts or so.

Regards

Nico
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Old 10th December 2007, 03:54 PM   #8
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Experimented with this one using Mosfets some weeks ago. Sounds great and good for about 12 watts.

I have no idea why use CCS they make neither sonic nor measurable difference.
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Old 10th December 2007, 04:14 PM   #9
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Then what about this, which includes your HF filter. The output cap is also nice for protecting your delicate tweeter against dc.

Ciao
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Old 10th December 2007, 04:15 PM   #10
Khron is offline Khron  Romania
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I took your advice and moved the caps. I had a bit of work uniting the grounds, but i hope i haven't messed it up more than it was before
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