Germanium Transistor 10 kHz Oscillator (CB14767E)

We found this circuit in the old Mullard transistor reference manual from 1960. The frequency can be changed by the coil and capacitor in parallel.

Powerful FM Transmitter (CB18668E)
This small transmitter with 2 transistors can reach several hundred meters using a 30 to 70 cm...
Electronic Potentiometer (CB16905E)
Although modern integrated versions exist, this 1995 circuit shows a discreet solution with common...
Millivoltmeter AC (CB7344E)
This circuit from Ferranti was released in 1969. It makes use of the company's transistors that admit...