JLH/PLH PC Boards? - Page 2

knutn · 10th October 2011, 07:02 PM

Yes I know what you mean. I have not quite decided yet if I am going to use a pot as done in the PLH amplifier. For the time being I have thought of using to resistors instead of the pot and then have the possibilty to change between push pull and something like halfway single ended.

Winding Man · 08:05 PM

Quote:

Originally Posted by knutn

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...

This is certainly looking good to me! - Nelson can help crit the design I am not up to that - but I mean the concept and the components!

I have a pair of Conrad MF35-151.5 heatsinks rated at 0.21C/Watt and I have IRFP240s - so yes very happy with the direction this is going knutn!

Thanks

WM

knutn · 14th November 2011, 07:05 PM

Winding Man - you've got PM

Winding Man · 18th November 2011, 01:09 PM

Quote:

Originally Posted by knutn

Winding Man - you've got PM

Replied!

Yes still interested!

Ta

WM

DJNUBZ · 26th January 2012, 03:32 AM

I would buy a pair of PLH PCBs.

Allen Newby · 26th January 2012, 06:39 PM

Knut,

You can balance the drive on the output transistors by splitting the 0.47 ohm sense resistor into a centre tapped pair of 0.235 ohms, with the the feedback resistor R14, the bootstap capacitor C20 and the loudspeaker connected to the same point. I used this approach in the latest version of my interpretation of ZenV4 - similar topology to J Aleph.

See: Aleph Current Source Mod

knutn · 28th January 2012, 02:11 PM

My objective was to make an all-FET JLH amplifier using the work done by Pass (the PLH amplifier). I do not doubt that the amplifier presented is very good, but a possible realization have to wait ....

26th January 2012, 03:32 AM	#15
DJNUBZ diyAudio Member Join Date: May 2003 Location: Chicago	I would buy a pair of PLH PCBs. __________________ My 3d printing startup, need something printed? Car Audio Connoisseur

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10th October 2011, 07:02 PM	#11
knutn diyAudio Member Join Date: Mar 2006 Location: Oslo	Yes I know what you mean. I have not quite decided yet if I am going to use a pot as done in the PLH amplifier. For the time being I have thought of using to resistors instead of the pot and then have the possibilty to change between push pull and something like halfway single ended.

14th November 2011, 07:05 PM	#13
knutn diyAudio Member Join Date: Mar 2006 Location: Oslo	Winding Man - you've got PM

26th January 2012, 06:39 PM	#16
Allen Newby diyAudio Member Join Date: Feb 2006 Location: peak district, england	Knut, You can balance the drive on the output transistors by splitting the 0.47 ohm sense resistor into a centre tapped pair of 0.235 ohms, with the the feedback resistor R14, the bootstap capacitor C20 and the loudspeaker connected to the same point. I used this approach in the latest version of my interpretation of ZenV4 - similar topology to J Aleph. See: Aleph Current Source Mod

28th January 2012, 02:11 PM	#17
knutn diyAudio Member Join Date: Mar 2006 Location: Oslo	My objective was to make an all-FET JLH amplifier using the work done by Pass (the PLH amplifier). I do not doubt that the amplifier presented is very good, but a possible realization have to wait ....