| Infrared Transmitter: |
 |
| Parts List: |
| R1 10 K 1/4 Watt Resistor R2 1 K 1/4 Watt Resistor R3 330 Ohm 1/4 Watt Resistor R4 100 Ohm 1/4 Watt Resistor C1 10 UF Electrolytic Capacitor C2 0.1 UF Ceramic Capacitor C3 10 UF Electrolytic Capacitor U1 555 Osc/Timer IC Q1 MPS2709 NPN Transistor Q2 2N3904 NPN Transistor IRD Infrared Transmitting LEDs |
| This Infrared transmitter uses a 555 running in its usual astable mode as the pulse source . Q1 and Q2 connected in the familiar darlington configuration boosts the pulse from the 555 to increase the infrared output from the IRDs. This circuit can be used in conjunction with the infrared receivers when used as a proximity detector. |
| ( Parts List at the bottom of page) |