The frequency of this circuit can be varied from zero. The circuit uses the CMOS 4046 and was found in the November 1984 issue of Radio Electronics magazine. The base frequency is given by C1.
This circuit was found in a RCA documentation from 1977. The integrated circuit is uncommon today. It is...
We found this circuit in a 1995 documentation. It can measure frequencies from 100 kHz to over 100 MHz...
This circuit was obtained in a Popular Electronics of the 90s. The circuit is compatible with...