TTL Counter (CB21360E)

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

Level change circuit with negative output (CB21597E)
Found in documentation from ON Semiconductor, this circuit provides a rectangular output signal with...
20 kHz counter with SCS (CB6614E)
We found this circuit in 1964 General Electric documentation. The circuit works with mechanical...
1 Hz Active Filter (CB6721E)
This very low frequency circuit was found in a 1964 Electronic Design. Transistors may be modern...