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JLH Mosfet Power amplifier construction thread
JLH Mosfet Power amplifier construction thread
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Old 22nd May 2018, 01:54 PM   #1
jamesfeline is offline jamesfeline  Togo
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Default JLH Mosfet Power amplifier construction thread

Hello

I have made many of these some years ago .. and have learnt very much by experimenting and seeing what other people have been doing. I thought I would dedicate this thread to some projects that I have in the pipe line for this amplifier. What has triggered this you may ask .. well I had a chance to listen to a couple of units that are still working and in fine fettle, and I was really impressed with the sound quality and the stability of the design and remembered how impressed I was when I first completed my first 2 units in the late 90's ....

so please enjoy and add your comments constructively ..
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Old 22nd May 2018, 01:57 PM   #2
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so 1st batch of pictures so we know what version we are talking about
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Old 22nd May 2018, 02:04 PM   #3
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Also .. I have decided to make a test bench for the JLH fully regulated power supply that was used. I have used this with the maplin mosfet amplifier just as an example with very great results. You could use this as a stand alone module for other amplifiers and is fully adjustable within reason of course .. so pictures of the test bench as work in progress .. I will update through the construction phase
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File Type: jpg IMG_1131.jpg (1,003.8 KB, 1484 views)
File Type: jpg IMG_1132.jpg (984.8 KB, 340 views)

Last edited by jamesfeline; 22nd May 2018 at 02:15 PM.
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Old 22nd May 2018, 02:58 PM   #4
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some more pictures of work in progress
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Old 23rd May 2018, 08:36 AM   #5
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Link for more info

A Paul Kemble web page - JLH mosfet amplifiers.
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Old 23rd May 2018, 08:40 AM   #6
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Picture of full schematic for reference
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Old 23rd May 2018, 04:56 PM   #7
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so, the boards shown in post 2 are your reproductions of the originals?
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Old 23rd May 2018, 05:14 PM   #8
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Default JLH 80W MOSFET

Hi Jamesfeline , I made this amp from a Williams hart kit nearly 20yrs ago. It
was fairly easy to construct, and it sounds smooth and very detailed.I have since learned there is a slight error in the earthing paths on the regulated pcb that has been mentioned on diyaudio forums. Basically it involves cutting a pcb track and connecting a wire link. All the best P M R
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Old 23rd May 2018, 06:33 PM   #9
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Quote:
Originally Posted by p m r View Post
Hi Jamesfeline , I made this amp from a Williams hart kit nearly 20yrs ago. It
was fairly easy to construct, and it sounds smooth and very detailed.I have since learned there is a slight error in the earthing paths on the regulated pcb that has been mentioned on diyaudio forums. Basically it involves cutting a pcb track and connecting a wire link. All the best P M R
Hello .. yes seen that thanks, many thanks for the info
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Old 23rd May 2018, 06:38 PM   #10
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Quote:
Originally Posted by ctrlx View Post
so, the boards shown in post 2 are your reproductions of the originals?
Hello ... these are the originals, but will make some gerber files later

I purchased a full batch of PCB's from william Hart kits when they were still trading many years ago .. purchased all they had at the time

also I had permission from William Hart & JLH to make commercial units ( I have this in writing signed) but obviously never pursued this option

Last edited by jamesfeline; 23rd May 2018 at 07:02 PM.
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