Infrared remote control system. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Infrared remote control system. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / infrared technology

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The general view of the device is shown in fig. 1, and the electrical circuit diagram - in fig. 2 and 3.

Technical characteristics of the device are given in the table.

Characterization	Value
Supply voltage	Transmitter - 9, receiver - 12
Consumption current, mA	Transmitter - 15, receiver - 30
Range of the device, m	7,5

Description of work

The circuit diagram of the device is shown in fig. 2 and 3.

Transmitter

On the elements IC3.3 and IC3.4 of the CD4093 chip, a carrier frequency generator is assembled, which is modulated by generators on the elements IC3.1 or IC3.2, the frequencies of which are set by potentiometers VR1 and VR2, respectively. These generators are controlled by the CH1 and CH2 buttons. The carrier frequency is set by potentiometer VR3. The modulated signal is fed to the transistor switch TR1 and then to the LEDs.

Infrared remote control system
Rice. 1. General view of the device from the NF244 kit

Receiver

The receiver is made on two LM567 chips (tone decoder). From the IR receiver, the signal is sent to the pin. 3 of these chips. Resistors R13 and R24 set the frequency at which the output of the microcircuit is activated. The signals from the decoders (pin 8) are fed to the trigger counters TR1-TR2 (first channel) and TR4-TR5 (second channel).

Further, the signals are fed to the current amplifiers on transistors TR3 and TR6, the loads of which are the windings of the executive relays.

Design

Structurally, the NF244 set is made on two printed circuit boards made of foil getinaks with dimensions

Rice. 2. Schematic diagram of the transmitter (click to enlarge)

100x53mm (receiver) and 40x70mm (transmitter). On fig. 4 shows the connection diagram of the receiver and transmitter.

Rice. 3. Schematic diagram of the receiver (click to enlarge)

Infrared remote control system
Rice. 4. Connection diagram of the transmitter and receiver

Author: Yu.Sadikov

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