Which receiver should i use because TSOP doesn't provide what i exactly want.
My application is that the LED should switch on when the wave is detected and should go off when it isn't. I want it to be like 50KHz so that it doesn't interfere with the TV remote signal. (56KHz will do, I can use TSOP 1756).
Ya, I tried using the comparator. It didn't work because the output of the TSOP (TSOP gives 5V when the wave isn't detected) when the wave is detected is not 2.5 actually, it is a series of pulses(just like a clock signal).
If you want that "the LED should switch on when the wave is detected and should go off when it isn't" -- That can be performed easily by connecting the output pin to a PNP transistor acting as a switch. You will get hints from the receiver circuit posted above. Also to operate the Transmitter at 56KHz is also no problem. Calculate NE555 Astable frequency using a calculator(available online) [check high time and low time].
Ya, I can make the emitter of 56KHz. But can you specify which receiver posted above should I be using to detect this 56KHz wave? If possible, provide the exact circuit diagram.
Thanks
Use the following diagram. You can use TSOP1756 or 1738 etc depending upon your transmitter.
View attachment 76727
The resistance connected to the LED is limiting the current. You can use 330 Ohm.
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