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Old 6th October 2011, 01:52 PM   #1
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Default JLH/PLH PC Boards?

Does anyone know if a PCB board was made for the PLH amp?

Ta

WM
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Old 6th October 2011, 05:39 PM   #2
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I did not make one, but I probably could.

What dimensions? Are you mounting outputs on the board?
What are the hole placements?

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Old 6th October 2011, 06:14 PM   #3
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Quote:
Originally Posted by Nelson Pass View Post
I did not make one, but I probably could.

What dimensions? Are you mounting outputs on the board?
What are the hole placements?

Hello Nelson,

I would want to mount the outputs on the board - well on the edge of the board I guess?

Mono boards and I was hoping to use the IRFP240's that I have assuming they can do the duty.
Dimensions are not critical would design the box around them...

I really dont know how you find the time to be so active in this forum and produce all the kit you do as well!

Much obliged.

WM
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Old 6th October 2011, 06:26 PM   #4
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I would totally buy a PLH board.
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Old 6th October 2011, 06:47 PM   #5
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Quote:
Originally Posted by bigfishe View Post
I would totally buy a PLH board.
Yes I am sure the list here will grow!

Nelson one other thing I have just thought of - I would want the version with paralleled output devices i.e Fig 11 in your writeup?

Thanks again.

WM
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Old 9th October 2011, 03:03 PM   #6
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O.K not growing... :-)

Never mind Nelson clearly not worth it!

I will look at recreating JLHs bipolar endeavours instead.

WM
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Old 9th October 2011, 03:28 PM   #7
knutn is offline knutn  Norway
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I am working on an all-FET version of the JLH class A, where the ouput is very similar to (OK, nearly a copy of..) the PLH amplifier. So it is a 4 transistor design. But I use split supply (plus/minus 24 V).
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Old 10th October 2011, 11:16 AM   #8
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Hello,

Thanks yes I would be interested - I need the PCB foil pattern though which is why I have switched to the JLH bipolar 1969 version - I have got a foil pattern for that.

Ta

WM
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Old 10th October 2011, 06:09 PM   #9
knutn is offline knutn  Norway
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Here is the schematic. I have ordered the PCBs, and as soon I receive them, I can start mounting the components before initial testing.

I plan to use a 2x18 V 500VA transformer common for the two channels. I also have two quite large heatsinks (0.3 K/W) which I plan to use. This amplifier favours high quiescent current, so maybe I can set this as high as 1.8 A...
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Old 10th October 2011, 06:30 PM   #10
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You are perhaps missing the opportunity to adjust the balance between
the positive and negative output drives. Look at the pots on the PLH
schematic.

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