This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
In the figure we have the simple way to obtain an integrator with an operational amplifier of type...
This control was obtained in an old publication from 1985 and uses a triac, which today can be of...
This Phase-Shift Oscillator produces sine low frequency signals suitable for many applications. It...