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I am working on an infrared transmitter and receiver for the remote control of a standard servo. The transmitter control signal is produced by a typical 555 IC set up and then modulated to 38khz by another 555 Ic. This Ic is left running at a constant 38khz necessary for the receiver IC. and the control signal switches this using a 4066 cmos analog or digital switch rather than enabling and disabling the 38khz 555 ic. This means 38khz signal can be monitored at any time for correctness of frequency. I will provide digram soon Regards Nedpicaxe