B21126E)
This circuit was taken from an old Popular Electronics. The circuit can have its frequency changed from an external signal. The center frequency is given by C1.
The integrated circuit used in this 2002 project is not very common. It is powered directly by the...
We found this circuit in a 1972 RCA technical documentation. The comparator can be any type and C1...
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...