IR Remote Extender Circuit

Schematic

Parts

Part Total Qty. Description Substitutions R1, R6 2 10K 1/4W Resistor R2 1 1K 1/4W Resistor R3 1 10K Linear Pot R4 1 2.2K 1/4W Resistor R5 1 47 Ohm 1/4W Resistor C1 1 0.01uF Ceramic Disc Capacitor Q1, Q2 2 2N3904 NPN Transistor D1 1 IR LED Radio Shack 276 143C U1 1 GP1U52X IR Module U2 1 TLC555 CMOS Timer LMC555, 7555 MISC 1 Board, Sockets For U2, Wire Notes Only the CMOS TLC555 timer can be used in this circuit. The original NE555 cannot operate reliably at 40KHz. Acceptable substitutions are shown in the parts list. Almost all powerful IR LEDs can be used for D1 if the appropriate value of R5 is chosen. To calibrate the circuit, use a frequency counter. Connect it in parallel with D1 and then ground the base of Q1. Adjust R3 for 40KHz on the counter. If a counter is not available, you will just have to point a remote at the circuit, press a button, and then adjust R3 until it works. This can take a few tries as not all remotes transmit continuously. If you intend to remotely mount D1 any great distance, you will need to use shielded cable. Connect the shield to circuit ground.