DTMF Remote Control GSM Based

It was a big experiment for testing this circuits, a very versatile remote control circuit which is consist of DTMF decoder IC 8870 & 4 bit BCD to decimal 4028 IC, Four binary outputs are connected to the inputs of BCD to decimal 4028 IC .You can control up to 9 appliances by this circuit,Continue reading “DTMF Remote Control GSM Based”