This variable frequency (VFO) oscillator was found in a Japanese publication of 1962. Coil details (in Japanese, but can be deduced) are next to the diagram covering the 3.5 MHz band.
Suitable for operation with high impedance microphones, this circuit was found in American...
Found in a 1969’s documentation, this circuit can supply currents from 100 to 120 mA at loads of...
The MC1436 can also be used on this circuit found in Motorola's 1993 Linear Interface ICs. The...