This circuit controls the passage of the signal from one speaker to another. The potentiometers must be of wire 50 to 100 ohms with dissipation according to the power of the sound system.
This circuit transmits beeps to receivers tuned in a wide range of frequencies placed nearby. The...
After starting, this circuit turns off the relay in a time that depends on the 4020 pulse-count. This...
This simple circuit can use general purpose transistors and SCRs like the TIC106. The warning...