TTL Counter (CB21360E)

This counter from 0 to 9999 was found in English documentation. The power source must be 5V with at least 1A.

1 MHz Pierce Oscillator (CB8050E)
The frequency of this Pierce oscillator, found in 1969 documentation, depends on the crystal. The...
0 to 20 second timer (CB20370E)
This simple timer with unijunction transistor was found in an old American technical...
Power supply with voltage quadrupler (CB22343E)
Found in documentation from the 1960s, this power supply employs germanium diodes from the time....