JohnW
pfm member
The only area where the MDAC2's "Original" headphone amplifier would have be less then optimal would have been into very low impedance loads where beyond about 100mA the output stage would drop out of Pure ClassA operation into ClassB.
This would never be be an issue with normal use - but very low impedance headphones current requirments could exceed 100mA - such as the HiFi Man ribbon headphones which really need a small power amplifier.
The idea is to design a "sliding class A circuit" where the heat dissipation can be kept under control - but if current is required beyond 100mA the circuit would insure the output stage remains in classA operation...
I'm also going to try using a MOSFET output stage... so ClassA Mosfet design...
This would never be be an issue with normal use - but very low impedance headphones current requirments could exceed 100mA - such as the HiFi Man ribbon headphones which really need a small power amplifier.
The idea is to design a "sliding class A circuit" where the heat dissipation can be kept under control - but if current is required beyond 100mA the circuit would insure the output stage remains in classA operation...
I'm also going to try using a MOSFET output stage... so ClassA Mosfet design...