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Old 24th November 2006, 03:32 PM   #1
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Default JLH (my version)

Hi!

Impressed by the sound of the original (BJT `69 JLH amplifier) I decided to experiment a bit and this is my "enchased" version of a JLH amp.

simulation results

THD=0.002%
Power on 4 Ohm (32W)
Power on 8 Ohm (16W)
OUtput mosfets bias (2A)

This is the PCB I made and becouse I got very little expirience in developing PCB-s, I hope you`ll hel me debug the PCB layout...

When all is done, PCB file and complete tutorial for making this amp will be attached for the interested DIY-ers.

Cheers!
Bogdan.
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Old 24th November 2006, 03:34 PM   #2
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pcb
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Old 24th November 2006, 11:15 PM   #3
roger-k is offline roger-k  Norway
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How does it sound?
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Old 24th November 2006, 11:54 PM   #4
lineup is offline lineup  Sweden
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Default JLH Class A - IRFP240 Vertical MOSFET

.
Looks like a good nice DIY amplifier.

Using IRFP240 vertical MOSFET, HEXFET.
Push-Pull.
Single Supply.
Pure Class A.

How much bias you have across 0.22 Ohm resistors?

If simulations data are somewhat right
then you have a real good HiFi amp there!
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Old 25th November 2006, 09:58 AM   #5
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bias is set to 2A.

the amp is wired now (point to point) and the sound is very, very good!


I just need advide on PCB. Is there some "big" errors? I have no much expirience...
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