How to build a LIRC receiver with an LED indicator

An LED indicator can be added to the basic Linux Infrared Remote Control (LIRC) receiver circuit with a minor modification and a few extra components.

Components

 * U1
 * Type 7805 +5V Regulator
 * U2
 * 38 kHz IR Receiver
 * U3
 * Digital inverter
 * 74LS04, 4049, or any other inverter
 * C1
 * 4.7µF capacitor
 * D1
 * Switching diode, such as 1N4148
 * R1
 * 4.7 kΩ resistor
 * R2
 * 100 Ω resistor
 * LED
 * Red LED

Description
Follow the instructions on the LIRC Receiver Web page for building the receiver.


 * Then, add U3,R2 and LED to your circuit.
 * U3 is an inverter
 * Attach the Vdd or Vcc pin to the Output of the voltage regulator
 * Attach the Vss or Gnd pin to the Ground pin of the voltage regulator
 * Attach one of the inverter pins, A1, to the IR receiver's output
 * Resistor, R2
 * Attach the pin of output of that inverter to the resistor, R2
 * LED
 * Attach the resistor to the positive of the LED
 * Attach the negative of the LED to ground