Process timer (CB21865E)

We found this timer for times of a few minutes in a 1974 Ferranti transistor manual. The relay is 37 mA sensitive type.

High voltage pulse generator (CB22480E)
This circuit generates pulses at a frequency that can be adjusted by a potentiometer. The circuit is...
455kHz Oscillator (CB21137E)
This oscillator uses a small IF transformer taken from an old transistor radio. FET admits...
Transistor relaxation oscillator (CB8041E)
Found in a 1970 EEE, this circuit generates signals that depend on the C1 capacitor. Transistors are...