Diode Tester (CB22137E)

This diode tester was found in an English publication from the 1980s. Transistors are general-purpose types of the time.

Delayed lighting (CB22128E)
This 12 V incandescent lamp switch with time delay can be found in old documentation. The SCR can...
Voltage 555 Astable Control (CB12487E)
With this circuit it is possible to control the frequency of a 555 astable, given by C1 and R1...
Transistor Monostable (CB998E)
This conventional astable uses two NPN transistor and was found in a publication of the year 1968. The...