This infrared transmitter use PWM (pulse width modulation). The transmitter is equiped with LM567, tone decoder circuit. Audio signal ( at least 50mVvv ) is amplified with T1 and then it is used to ...

The circuit what we are going for is below, you can read the datasheet for the tone decoder IC to find the calculations on selecting the right frequency. Note the pin numbering on the above diagram, ...

He first built a breadboard decoder circuit that would light 1 of 16 LEDs depending on the detected button press. This was well and good, but he decided that an Arduino-driven LCD display would ...

This DTMF decoder uses the MT88L70, powered by 3.3v and interfacing with 3.3v GPIO to decode the touch tone keys. It has an RJ phone jack and 600:600 transformer to connect to a phone line to pick up ...

The upper blocks repre- sent the tone transmitter, the lower the receiver, while those in the centre and to the right form the interface to the CB radio. 1 II V Circuit description Ub fe-0-10 miM 100n ...

36 PC AS TONE GENERATOR J. Schafer DL7PE A GW-BASIC program and a few modifications to the loudspeaker circuit enable any PC, whether an XT, AT or compatible, to function as a precision tone generator ...

Dual-tone multiple-frequency (DTMF) receiver IC is commonly used in telephone equipment. One common DTMF receiver is Holtek HT9170 used in electronic communication circuits. The Holtek HT9170 series ...

Abstract: This decoder accepts eight tone frequencies, from which it will produce twenty-one separate outputs. It meets all NASA requirements for address-execute command equipment.' The design and ...