This is my headphone amplifier: I
choose this kit because I like the circuit. I was just going to design
a similar one by myself when a friend of mine pointed me to the cheap
already made boards at amb.org: the circuit already has many options
that I wanted to try (as the JFET input, the CFP output stage...).
I built this as two separate enclosures, one with the audio circuit and
the other with a linear, regulated bipolar power supply.
Both units with my headphones on top.
This is the PCB during assembly, without the output transistors. I use
normal, industrial grade components. Quality ones aren't cheap, don't
be fooled by the "audiophile capacitor" thing...
The CK2-III finished in the appropriate Hammond case. I used
a stepped attenuator for volume control, with metal film SMD resistors.
I also included an impedance switch, to choose between the low-Z output
of the CK2 by itself, and the 120Ohm of the headphone
"standard". The connection between the two boxes is accomplished with a
microphone connector system, which is not the popular XLR / Cannon, but
a cheaper one (used in CB rigs, for example).
The complete audio unit, with a white LED.
The power supply printed circuit board, to be enclosed in a separate
box. It implements mains noise filtering, an Hammond low noise
transformer, soft recovery Schottky diodes and a discrete series
regulator.
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