Found in a 90's EDN, this circuit generates signals in the frequency range given by the graph. The circuit requires a symmetrical power supply.
This small inverter came out in an Argentine magazine from the 1970s. It can also be assembled with...
We found this circuit in Radio Electronics from the 90s. The components are current. The sensor is a...
This second-order filter was found in old American documentation and can be applied to other...