LCD-LED DisplayZener Diode

Universal IR Remote Control Tester Schematic Circuit Diagram

This tester consists of two integrated remote control receivers whose outputs drive an LED to indicate when a suitable infrared signal is received. To cover all current infrared remote controls, one receiver (the TSOP1736) has maximum sensitivity to carriers at 36 kHz, the other (the TSOP1738) to carriers at 38 kHz.

Universal IR Remote Control Tester Schematic Circuit Diagram

 

This tester consists of two integrated remote control receivers whose outputs drive an LED to indicate when a suitable infrared signal is received. To cover all current infrared remote controls, one receiver (the TSOP1736) has maximum sensitivity to carriers at 36 kHz, the other (the TSOP1738) to carriers at 38 kHz.

The other LED (D3) indicates when power is applied. The LEDs are white with a minimum output of 20,000 mcd at 20 mA, which means that even at 5 mA (the maximum output current of the receiver ICs) the indicator LED will light reasonably brightly. In his prototype, the author used 5 mm LEDs with an output of typically 55,000 mcd at 20 mA.

The Zener diode reduces the supply voltage for the receiver ICs to about 4.3 V. In fact, they will operate reliably down to about 3.2 V. The circuit is powered from a 9 V PP3-style (IEC: 6LR22) battery, and will function until the battery voltage falls to about 7 V.

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