Found in a 1965 General Electric datasheet, this low frequency circuit divides the frequency of a 20 kHz signal by 10, thus obtaining a 200 Hz signal.
This circuit was found in an English magazine from 1976. The transistors can be the BC548. The...
This is an improvement on the previous circuit with a preamplification stage. The circuit is from...
We found this circuit in a 1974 integrated circuit manual. Operational amplifiers can be of...