50 Keys Black Universal Remote Control For LG DVD Player

Plastic Remote Control 50 Keys For LG 65UP7500PTZ / LG 55UP7500PTZ / LG 43LM5650PTA TV

The infrared receiving circuit is usually integrated into one component by the manufacturer, and becomes an integrated infrared receiving head. The internal circuit includes infrared monitoring diode, amplifier, sub limiter, band-pass filter, integration circuit, comparator, etc. The infrared monitoring diode monitors the infrared signal, and then sends the signal to the amplifier and the limiter. The limiter controls the pulse amplitude at a certain level, regardless of the distance between the infrared transmitter and the receiver. The AC signal enters the band-pass filter. The band-pass filter can pass the load wave of 30 kHz to 60 kHz, and enter the comparator through the demodulation circuit and the integration circuit. The comparator outputs high and low levels to restore the signal waveform at the transmitting end. Note that the high and low levels of the output and the transmitting end are inverted, so as to improve the receiving sensitivity