Hello Joan,

I am currently working on a project using the LM567 for decoding of slow
on-off keying (OOK).  I have found that the voltage controlled oscillator
(VCO) signal gets into the high gain part of the circuit.  I was able to
alleviate this by using a separate 5V three terminal regulator to supply
the LM567.  I also had to add a choke from the B+ line to the input of
the regulator;  and a decoupling cap.

In my experience, the LM567 is easily triggered by noise.  I used an
opamp integrator after the LM567 to improve the noise immunity.  But I am
decoding slow OOK at 2500 Hz.

Jim Albers

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