Lamp Timer (CB21291E)

This circuit was found in a Popular Electronics from the 90s. The circuit uses TTL technology and must be powered by a voltage of 5V.

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Sequential unijunction timer (CB10190E)
This circuit with unijunction transistors was found in a documentation from the 80's. The trigger...
Rain Alarm (CB12276E)
We found this alarm in an English publication from 1978. Although the original power supply is 3...
Binary Demonstrator (CB24244E)
This TTL circuit was found in the February 1973 issue of Radio Electronics magazine. The power...