LED indicator in the remote control. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / infrared technology
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Today, almost any household audio and video equipment is controlled by pressing buttons on remote controls (RCs). After prolonged use, the contacts of the buttons wear out and become dirty. This leads to failures in the supply of commands. Often, failures are the result of the remote control battery being discharged. In order to timely detect the failure of the remote control, I propose to install an LED on it in the visible part of the spectrum, flashing confirming the transmission of the command. Additional light indication very slightly increases the current consumed by the remote control, the service life of its battery practically does not change.
On fig. 1 shows a fragment of the remote control circuit for the RN830AN video player from LG. The designations of the elements already present in the remote control correspond to the markings on the printed circuit board, and the newly introduced elements are highlighted in color. During the transmission of the command, a pulsed current flows through the infrared emitting diode D1 and the resistor R1. A small part of it branches off into a circuit of resistor R2 and red LED HL1. As a result, when the buttons of a working remote control are pressed, the LED flashes in time with the pulses of the command being sent.
A fragment of the LG-21S10E TV remote control circuit is shown in fig. 2. In this version, there is no resistor in the collector circuit of the transistor TR1, and the voltage drop across the emitting diode D1 is too small to ignite the visible range LED. Therefore, the HL1 LED is controlled by a key on the transistor VT1, the base of which is connected to the collector of the transistor TR1 through the resistor R2.
The newly installed parts are hinged mounted on the free space of the printed circuit board, a hole is drilled for the LED in the remote control case. The AL307BM LED can be replaced with another domestic or imported red glow. Other colors are undesirable due to the increased voltage drop across the LEDs. Transistor VT1 - any of the KT3107, KT361 series.
Author: I.Potachin, Fokino, Bryansk region
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