IR Music Transmitter and Receiver

Using this circuit,
audio musical notes can be generated and heard up to a distance of 10
metres. The circuit can be divided into two parts: IR music transmitter
and receiver. The IR music transmitter works off a 9V battery, while the
IR music receiver works off regulated 9V to 12V. First diagram shows
the circuit of the IR music transmitter. It uses popular melody
generator IC UM66 (IC1) that can continuously generate musical tones.

Transmitter circuit diagram:

IR Transmitter Circuit

IR Transmitter Circuit Diagram

Receiver circuit diagram:

IR Receiver Circuit

IR Receiver Circuit Diagram

The melody generated by IC UM66 is transmitted through IR LEDs,
received by phototransistor ceived by phototransistor T3 and fed to pin
2 of IC µA741 (IC2). Its gain can be varied using potmeter VR1. The
output of IC µA741 is fed to IC LM386 (IC3) via capacitor C5 and
potmeter VR2. The melody produced is heard through the receiver’s
loudspeaker. Potmeter VR2 is used to control the volume of loudspeaker
LS1 (8-ohm, 1W). Switching off the power supply stops melody generation.

Author: Pardeep G – Copyright: EFY Mag

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