JLH/PLH PC Boards?

Winding Man · 6th October 2011, 01:52 PM

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

Ta

WM

Nelson Pass · 6th October 2011, 05:39 PM

I did not make one, but I probably could.

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

Winding Man · 6th October 2011, 06:14 PM

Quote:

Originally Posted by Nelson Pass

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

bigfishe · 6th October 2011, 06:26 PM

I would totally buy a PLH board.

Winding Man · 6th October 2011, 06:47 PM

Quote:

Originally Posted by bigfishe

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

Winding Man · 9th October 2011, 03:03 PM

O.K not growing... :-)

Never mind Nelson clearly not worth it!

I will look at recreating JLHs bipolar endeavours instead.

WM

knutn · 9th October 2011, 03:28 PM

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).

Winding Man · 10th October 2011, 11:16 AM

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

knutn · 10th October 2011, 06:09 PM

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...

Nelson Pass · 10th October 2011, 06:30 PM

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.

6th October 2011, 01:52 PM	#1
Winding Man diyAudio Member Join Date: Jun 2006	JLH/PLH PC Boards? Does anyone know if a PCB board was made for the PLH amp? Ta WM

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6th October 2011, 05:39 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	I did not make one, but I probably could. What dimensions? Are you mounting outputs on the board? What are the hole placements?

6th October 2011, 06:26 PM	#4
bigfishe diyAudio Member Join Date: Jan 2007 Location: Nashville	I would totally buy a PLH board.

9th October 2011, 03:03 PM	#6
Winding Man diyAudio Member Join Date: Jun 2006	O.K not growing... :-) Never mind Nelson clearly not worth it! I will look at recreating JLHs bipolar endeavours instead. WM

9th October 2011, 03:28 PM	#7
knutn diyAudio Member Join Date: Mar 2006 Location: Oslo	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).

10th October 2011, 11:16 AM	#8
Winding Man diyAudio Member Join Date: Jun 2006	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

10th October 2011, 06:30 PM	#10
Nelson Pass The one and only Join Date: Mar 2001	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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