IR EMITTER CIRCUIT

Published:2012/11/9 0:30:00 Author:muriel | Keyword: IR EMITTER CIRCUIT | From:SeekIC

+5V 555 +5V | TIMER | / +-----------+ | \ 1| |8 | / 10ohms GND -----|GND Vcc|-----+ \ | | \ / | | / | 3| | \ 2.2K +-------------------|OUT | / | | |7 \ | | DISCH|-----+ | 4|- | \IR LED ||--+ +5V -----|R | / <|| | | \ 200K ||--+ | | / | 2| |6 \ | +---|TRIG THRES|-----+------+ | | | | | | | | +-----------+ | | GND | | ----- .1uF | | ----- +---------------------+ | | GNDNotes: Adding more IR LED's will increase the range of the IR detector. The signal on pin 3 of the 555 is 30Hz and has a duty cycle of 50% Due to the very small pull-up resistor the 555 sinks about 109mA. The specs say the 555 can sink up to 225mA so it's well below the danger level.



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