This circuit generates frequencies determined by R3 and C1. We found it in the Radio Electronics magazine of May 1988. The power supply must be symmetrical.
This decoder filter was found in a 1975 documentation. The integrated circuits can be 741. The...
We found this circuit in the February 1984 issue of Radio Electronics magazine. It uses an...
This circuit is suggested by Texas Instruments' Linear Circuits Applications. It consists of an...