Bistable 7400 (CB22408E)

The figure shows how to connect a 7400 to obtain a bistable configuration. The circuit must be powered with 5 V.

Burnt out lamp indicator (CB10449E)
This circuit was obtained in a 1977 magazine, but it can still be easily assembled, as the...
Walkie Talkie (CB20470E)
This intercom for the 27 MHz band was found in a recent English documentation, working with a...
Shield with 7481 (CB24730E)
This relay shield circuit for old computers was found in January 1983 Radio Electronics magazine. The...