elsey.jack
New Member
Hello, I'm working on a project that involves transmitting data over a set of walkie-talkies. I am using a microcontroller to generate the signal (703 Hz) and a LM567 tone decoder to detect the signal on the other end.
Problem is, I can't get the LM567 to work! The circuit I have set up should turn off the LED when ever a ≈703 Hz signal hits pin 3, but the LED remains lit. Here's is my schematic:
C1 = .1 uF
C2 = 1 uF
C3 = .1 uF
R1 = 12.93 kΩ
R2 = 1 kΩ
Signal voltage = 110 mV AC (square wave)
I've looked at the datasheet (which is confusing) and pored over all of the other related threads (which are great
), but I can't figure out what my problem is. Am I maybe getting something about the logic output at pin 8 confused?
Any help would be appreciated,
Jack
Problem is, I can't get the LM567 to work! The circuit I have set up should turn off the LED when ever a ≈703 Hz signal hits pin 3, but the LED remains lit. Here's is my schematic:
C1 = .1 uF
C2 = 1 uF
C3 = .1 uF
R1 = 12.93 kΩ
R2 = 1 kΩ
Signal voltage = 110 mV AC (square wave)

I've looked at the datasheet (which is confusing) and pored over all of the other related threads (which are great
Any help would be appreciated,
Jack