| ??? 06/13/08 08:59 Read: times Msg Score: +1 +1 Informative |
#155811 - Start like this Responding to: ???'s previous message |
R4 provides positive feedback, so that the threshold changes with the output level. I've inverted the sense of the circuit as it makes it easier to analyse and modify.
Most IR leds will take at least 20mA, so I suggest using a lower value for the current setting resistor. Search thousands of opamps in seconds using my opamp chooser |
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