See post #15. Put your DMM in a cupboard and leave it there.with DMM it does not appear ( maybe because its at high frequency ?) .
Maybe , i will find a way to make it work .I see nothing to suggest that the IC is broken (but by all means try a new one)
Either the design is flawed, or I my understanding is flawed.
Somehow, the input to the IC needs to get to well below 2 Volts to give a high out (and turn off the LED) I do not see how a resistor to +5V can achieve a good low input to the gate.
..... there just seems something very wrong with that circuit - or maybe I just don't understand
I don't suppose this could be a break-beam detector could it? Continuous 38kHz reception (modulated) normally, then LED lights when an obstacle breaks the beam? ... just a thought.
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by Jake Hertz
by Jake Hertz
by Aaron Carman