Lots of consumer electronic equipment like TV sets, VCRs, CD and DVD
players employs infrared remote control. In some cases, it is desirable
to extend the range of the available control and this circuit fits the
bill, receiving the IR signal from your remote control and
re-transmitting it, for example, around a corner into another room.
Photodiode D4 is connected to the inverting input of a 741 opamp through
resistor R2 and capacitor C1. Since the BPW41 photodiode (from
Vishay/Telefunken) needs to be reverse-biased to turn light energy into a
corresponding voltage, it is also connected to the positive supply rail
via R1. The non-inverting input of the ‘741 is held at half the supply
voltage by means of equal resistors R3 and R4.
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