The circuit presented uses two common transistors and is powered by the circuit being tested. The circuit is for TTL logic, since its supply is 5 V.
This circuit for heating elements was taken from a 1966 General Electric manual. The SCRs are...
This circuit also detects leaks and rain. I found it in a 1967 English magazine, but it can be...
August 2017 - This Maxim component, available from Mouser Electronics, is ideal for wearables,...