Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the amplitude of the input and output signals.
The transistor of this oscillator can be 2N2222. L1 is formed by 9 turns of wire 26 with a socket...
We found this circuit in a European publication of the 1980s. The transistor could be the BC549. The...
) This two-transistor circuit features excellent gain operating with low impedance microphones. The...