Found in an Electronic Design, this circuit makes use of general-purpose bipolar transistors. The circuit can be adapted to operate at lower voltages
We found this automotive application circuit in an old American documentation. All components are...
This filter has a cut-off frequency of 1 kHz by letting pass those that are above this value. The...
This circuit was found in a 1967 US documentation. It shows how to build a gain control by digital...