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donmakeme

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when i test this two circuit together i don know why keep on my transmitter IC 555 keep on get burn when i turn my VARIABLE RESISTORS to the max.
 

You must add a resistor in series with the LED. What is happening is the transmitter output is trying to sink too much current and being damaged. Without knowing the LED characteristics, I would suggest a resistor of no less than 150 Ohms so the current is limited to about 50mA.

Brian.
 

thank ! Do u have any better transmitter & receiver circuit? stat why is it better thank.
 

betwixt said:
You must add a resistor in series with the LED. What is happening is the transmitter output is trying to sink too much current and being damaged. Without knowing the LED characteristics, I would suggest a resistor of no less than 150 Ohms so the current is limited to about 50mA.

Brian.
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The LED is photodiode TIL32.
 
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