CMOY Headphone Amplifier
These headphone amps were constructed from instructions on Tangent's web site. These were made to get practice in using proto-board and to test various op-amps.
I tried various op-amps:
In these particular headphone amps, the op-amp proved very important to performance especially when using a single 9 volt battery.
Test power supply: 1x9V and 2x9V battery.
The noisy CD proved a problem with these amps. I assume they have poor noise rejection. The OPA2134PA op-amp was the only one that gave reasonable results.