Fuse Test (CB22165E)

This circuit is from an old documentation, but perfectly current. In place of the battery, 2 or 4 small cells can be used.

Phase Modulator (CB7928E)
This circuit is from a 1968 Electronic Design. The components are from the era and the operating...
Piezoelectric transducer driver (CB8117E)
This circuit was found in an Electronic Design from the 90s. The integrated circuit is from that...
Timer Switch (CB16474E)
This circuit, from a 1988 documentation, activates a relay for a period and has a touch shutdown as...