Door buzzer or alarm (CB20492E)

This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose NPN.

Completing the Last Cycle (CB13639E)
The purpose of this interesting circuit found in a 1977 documentation is to complete the last...
High Power AC Shield AC (CB18266E)
This circuit allows to drive a triac with high power AC load from a CMOS output or directly from a...
TTL Clock Generator (CB20094E)
This circuit was obtained in a documentation from the 80's. However, using TTL it is still modern,...