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All MOSFET Class A headphone amplifier
All MOSFET Class A headphone amplifier
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Old 28th January 2016, 05:37 PM   #1
kacernator is offline kacernator  Czech Republic
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Default All MOSFET Class A headphone amplifier

Hi,

here is the schematics of headphone amplifier. It is DOGC amplifier by Dr. Bora Jagodic, but without current dumping class C stage, lower rail voltages and gain set to 6x.
Design has not been build yet. It is recommende to use different P-channel mosfet than IRF, becuase of the transconductance problem. I will be using FQP7P06. Bias current is 200mA for output fets and 20mA for input fets. Note that input fets will require small heatsink!

Schematic is not final, I will add DC servo later.

For PSU I was thinking about using Super regulator by Jung / Didden.

I will be designing PCB boards too, but later.
Attached Images
File Type: jpg DOGC-HEADPHONE SIM.JPG (137.9 KB, 450 views)
File Type: jpg DOGC-HEADPHONE SIM - AC plot.jpg (360.9 KB, 429 views)
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Old 18th September 2017, 12:31 AM   #2
donovas is offline donovas  South Korea
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hi, any update on this project?
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Old 18th September 2017, 04:04 PM   #3
kacernator is offline kacernator  Czech Republic
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No, project is cancelled.

Better to use opamp with current buffer.
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Old 18th September 2017, 04:46 PM   #4
Nico Ras is offline Nico Ras  South Africa
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Quote:
Originally Posted by donovas View Post
hi, any update on this project?
Why? Are you interested in an HP amp?

I am using one that Hugh designed in about 2008 which performs really well. Two transistors only, class A, driven from a 12 -15VDC wall wart.
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Old 19th September 2017, 03:46 PM   #5
xrk971 is offline xrk971  United States
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All MOSFET Class A headphone amplifier
Ha ha,.. I have a lot of headphone amps designed by Hugh using only two actives, and always cap coupled output. Too dangerous and complex to do otherwise with headphones. They do sound great.
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