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RE: CCS for OTL headphone amp

Posted by JKT (A) on October 5, 2017 at 15:41:39

In Reply to: CCS for OTL headphone amp posted by f12ank_p on October 4, 2017 at 14:34:39:

I would recommend cascoding the anode load CCS on the input stage with a BC558B. The emitter of the BC558B connects to the current set trim pot and the collector to the emitter of the MJE350. Change the bias string to LED/2.2K/33K. Base of the BC558 to the junction of LED & 2.2K, base of the MJE350 to junction 2.2K/33K. Other end of 33K is grounded.

Also, I would ditch the CCS load on the output cathode follower in favor of one of Kevin's cascode MOSFET CCS kits.

note: see p.146 Morgan Jones 4th ed. for circuit diagram for the cascode anode load CCS.


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