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JFET-MOSFET headphone amplifier J-Mo 3
JFET-MOSFET headphone amplifier J-Mo 3
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Old 29th December 2017, 02:32 AM   #71
rjm is offline rjm  Japan
Richard Murdey
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JFET-MOSFET headphone amplifier J-Mo 3
@withmatt

Note you can drive your boards from a DC voltage as is, with no modification needed whatsoever. The bridge recitifier now acts as a safety, it makes the power inputs unipolar which is a neat little feature.

This means you can sit back and experiment with external DC power supplies to your hearts content until you find something that works for you.
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Last edited by rjm; 29th December 2017 at 02:35 AM.
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Old 9th March 2018, 03:04 PM   #72
obscurus is offline obscurus
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Hi, if I plan to go with smd for this headphone amplifier, which smd jfet can I use?
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Old 1st July 2018, 09:13 PM   #73
lineup is offline lineup  Sweden
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What a great headphone amplifier!!
J-MO = JFET + MOSFET

J113 is a JFET I can buy from my dealer.

@rjm
I think this picture should show the final design.
If not please inform me.
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File Type: png jmo3-J113-sch.png (8.4 KB, 258 views)
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Old 1st July 2018, 11:00 PM   #74
arpagon is offline arpagon  Bulgaria
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Quote:
Originally Posted by lineup View Post
What a great headphone amplifier!!
J-MO = JFET + MOSFET

Come on, please tell me this is some kind of joke!
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Old 2nd July 2018, 01:18 AM   #75
rjm is offline rjm  Japan
Richard Murdey
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JFET-MOSFET headphone amplifier J-Mo 3
Quote:
Originally Posted by arpagon View Post
Come on, please tell me this is some kind of joke!
Well, I mean - err.. of course it is. Though the humor looks a bit dated now, the original circuit came out shortly before the album.

@Lineup

Yes, that's the final circuit schematic revision. The rest of the materials are attached.
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File Type: zip pcb-jmo-30g2-ss-bom-full.zip (198.0 KB, 49 views)
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Old 2nd July 2018, 06:20 AM   #76
lineup is offline lineup  Sweden
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Quote:
Originally Posted by arpagon View Post
Come on, please tell me this is some kind of joke!
No, I really mean my positive words.
For headphones amp we can make it simple but good working.
I like Keep It Simple, KIS, designs.
And RJM would not publish if it wasn't good.

I see there are followers that has further developed this concept in their circuits.

@rjm
Thanks man. Keep on your good works
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Old 2nd July 2018, 06:36 AM   #77
thimios is offline thimios  Greece
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Quote:
Originally Posted by rjm View Post
Well, I mean - err.. of course it is. Though the humor looks a bit dated now, the original circuit came out shortly before the album.

@Lineup

Yes, that's the final circuit schematic revision. The rest of the materials are attached.
What software is used for pcb and schematic?
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Old 2nd July 2018, 03:41 PM   #78
rjm is offline rjm  Japan
Richard Murdey
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JFET-MOSFET headphone amplifier J-Mo 3
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Old 3rd October 2018, 08:53 AM   #79
marconi118 is offline marconi118  Germany
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can we use 2SK2145 or 2sk209 for this project?

they are toshiba for audio and to my humble advice similar to J113
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Old 3rd October 2018, 02:17 PM   #80
rjm is offline rjm  Japan
Richard Murdey
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JFET-MOSFET headphone amplifier J-Mo 3
Choice for the FET and MOSFET are pretty much open. You may have to re-bias the circuit by changing the resistance values. Finding the right values can be done in simulation or bread-boarding.
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