We found this circuit in an 80's Electronic Design. It makes use of couplers of the time that can be replaced with equivalents.
This filter is inserted between the interfering device and the interfering device. The coils are...
One touch on S1 and the circuit turns on. With a tap on S2 it turns off. This is the purpose of...
The purpose of this circuit is to prevent TTL circuits from receiving a voltage greater than 5 V...