TTL Counter (CB21360E)

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

2 Transistor Spy Transmitter (CB19429E)
This transmitter operates with a voltage of only 1.4 V, and can then be powered by a single...
Two controls relaxation (CB9247E)
Found in an Electronic Design of 1964 this circuit has a control for the frequency and another for the...
VHF TV tuner (CB20251E)
This old circuit, from the 80s, was found in American documentation. The circuit uses dual gate...