We found this circuit in the August 1994 issue of Electronics Now magazine. The circuit is based on the now uncommon CMOS 4046. The frequency range is given by C1.
This circuit is based on the light comparison of two LDR sensors. We found it in a 90s Popular...
This circuit is suggested by the Texas Instruments manual of linear applications of the 90's. The...
This circuit was found in American documentation from the 90s. It serves as an amplifier for a...