Matt circuit

This Mark3 version of the Infra Red extender is a special version designed to control appliances that use high frequency modulated IR remote controls. Notes: IR appliances use pulses (control signals) sent over a modulated IR carrier wave. The carrier wave may be modulated at various frequencies, 36-38KHz being the most popular.Some Satellite receivers use even higher frequencies than this. The IR1 remote module receives an infra red signal and separates control pulses from the modulation. To re-transmit, a 555 timer is configured as an astable oscillator. The 555 timer is controlled by the signal on the reset pin, high generating a carrier and low no carrier. Each control pulse turns on the oscillator for the duration of a logic high signal and off for a logic 0 signal, thereby creating a newly modulated IR signal. The IR module, part number IR1 is available from Harrison Electronics in the UK, IR1 may not be listed in their catalogue but if you ask for an IR1, they will send you the ...

The circuit is very effective to test the remote controls what still works or not, the remote record will be tested using infra red. Examples of the TV remote, AC and others. Please try I am sure 100% will be successful. TV  Remote Tester Circuit The workings of the circuit is very simple, when the infra red sensor receive infrared signals pin 2 sensor will produce a voltage, this voltage will drives the PNP transistor so that the LED lamp and piezo disc (BZ) is active. for the power supply you can use a 9 volt battery and then use IC 7805 or use 1.5 volt batteries x 3 Following the specification of components installed Transistor BC557 TSOP 1738 Sensor Infra Red R1 = 10k ohm ¼ watt Resistor R2 = 1k ohm ¼ watt Resistor R3 = 1k ohm ¼ watt Resistor BZ = piezo disc led

4 Channel Infrared (IR) Remote is a simple project using the popular HT12A and HT12D encoder / decoder chips from Holtek. Specifications Supply – Transmitter: 2.4 ~ 5 VDC, 5 V @ 20 mA & Receiver: 5 ~ 6 VDC, 5 V @ 50 mA Output – 4 Latched/Momentary TTL compatible outputs Crystal based oscillator for reliability of operation DIP switch selectable 8 bit address code LED output to indicate reception ON/OFF slide switch in the transmitter Power-On LED indicator in the Receiver / Transmitter High noise immunity Berg connector for interfacing of the board Four mounting holes of 3.2 mm each PCB dimensions – Transmitter: 61 mm x 47 mm & Receiver: 46 mm x 46 mm [ ]