I have been trying to get this circuit to work all morning. The LED's are supposed to turn on when a 19.2KHz tone appears on the LM567's input.
Here is the circuit. Originally downloaded off the net (identical from
2 sources) but I re-drew it in DipTrace to send here for clarity. Click the image to enlarge.
formatting link
Any suggestions where the problem might be? ... apart from me that is.
Ralph