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Old 28th January 2016, 04:37 PM   #1
diyAudio Member
Join Date: Jan 2008
Default All MOSFET Class A headphone amplifier


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, 169 views)
File Type: jpg DOGC-HEADPHONE SIM - AC plot.jpg (360.9 KB, 157 views)
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