Can be directly connected to CD players, tuners and tape recorders. Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 Ohm.
Schematic shows left channel only.
# B1, SW1, J1 & C3 are common to both channels.
# R3 value was calculated for headphone impedance up to 300 Ohm. Using 600 Ohm loads or higher, change R3 value to 100K.
# An interesting upgrade for this circuit was suggested by Mike Baum, NY USA. Th