This circuit with an unusual configuration was found in the January 1974 issue of Radio Electronics magazine. The frequency is given by L1/C1, and the transistors admit equivalents.
The circuit of the figure serves the same purpose as the previous one (CB5057E), but has a...
In the figure below we have a typical circuit for applying a current sensor that can be used in...
The figure shows a way to apply gain control to the LM3600 OTA. The circuit is from a Radio...