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High Performance Class A Current Feeback Headphone Amplifier
High Performance Class A Current Feeback Headphone Amplifier
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Old 7th November 2014, 01:56 AM   #11
monty78pig is offline monty78pig  England
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High Performance Class A Current Feeback Headphone Amplifier
As long as the temperature doesn't get silly then it should be fairly stable. Once the offset is adjusted via R4 it should be good. Those CCS transistors aren't dissipating that much power anyways.

Q4 and Q5 control the current through Q1. Q2 and Q3 control the correction current in the feedback loop needed to correct the DC offset on the output.

The only thing the circuit depends on is that the Base-Emitter voltages stay fairly stable.
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Old 7th November 2014, 09:16 PM   #12
sgrossklass is offline sgrossklass  Germany
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SRPP style output with good PSRR, pretty clever. I take it the circuit needs a low-impedance source to drive it though, right? I'd see issues with highs rolloff and input impedance distortion past about 2-3 kOhms or so.
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Old 7th November 2014, 09:27 PM   #13
monty78pig is offline monty78pig  England
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High Performance Class A Current Feeback Headphone Amplifier
Input impedance distortion shouldn't really be a problem at any output impedance level as the impedance at the base will never be more than 27000 ohms. Even then the distortion caused by input impedance will be 5 times less than that caused by the impedance of the feedback network (which is quite low anyway).

High impedance sources may cause frequency response issues but I designed this circuit for output impedances not higher than a couple of hundred ohms. In reality the circuit is going to be inside a preamp anyway so the drive impedance will be less than 50 ohms. I've just shown it with the RF blocking RC network so it can be presented as an external unit.
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Old 9th November 2014, 03:02 AM   #14
monty78pig is offline monty78pig  England
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Thinking of turning this topology into a small audio amp...
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Old 12th November 2015, 02:01 PM   #15
monty78pig is offline monty78pig  England
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High Performance Class A Current Feeback Headphone Amplifier
Going to be building this circuit soon. But I'm going to take heed and use an LF412 to control the DC offset!
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