Metal locator (CB7506E)

This simple metal detector was found in a 1960 Sylvania transistor manual. The phone must be high impedance or crystal.

Constant current source (CB21536E)
Found in a 1969 Electronic Design, this circuit is intended to power a load up to 300 mA....
Up to 65 MHz Oscillator (1 transistor) (CB13140E)
With the circuit shown in the figure it is possible to generate signals up to 65 MHz. The values of...
Simple Inverter (CB21825E)
This stable with the waveforms oscillates at 1006 Hz. We found it in a Ferranti manual from 1964....