This circuit uses one of the first commercial transistors, availble in 1958, year of the publication were it is described. L1 is formed by 100 turns of 26 or 28 AWG wire on a ferrite core. Earphones must be magnetic high impedance types.
This circuit uses one of the first commercial transistors, availble in 1958, year of the publication were it is described. L1 is formed by 100 turns of 26 or 28 AWG wire on a ferrite core. Earphones must be magnetic high impedance types.
