Thursday, May 8, 2008
Build IR Transmitter Circuit (Fig. 1)
The astable multivibrator (NE555) oscillates at a frequency of around 38 kHz, which is transmitted by the IR LED. 47 Ohms resistor limits the current across the IR LED. The variable resistor (100K) is a must for the below circuit as we need to adjust the frequency of the transmitting IR signal.
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