The integrated circuit used in this trigger is uncommon today. We found it in a documentation from the 70s. The circuit operates with signals up to 50 kHz.
We found this game for two competitors in a Popular Electronics from the 80's. The circuit can be...
We found this simple alarm circuit in a 1981 documentation. As we can see, it is a car alarm...
This circuit has appeared in several versions in this section and on our website. The transistors can be...