We found this circuit in the Radio Electronics magazine of May 1977. The circuit has the frequency given by the components according to the formula next to the diagram.
The first circuit is shown in figure 3 and uses a 2N2222 transistor or equivalent. This circuit can...
This half-wave regenerative control was found in an old RCA manual. The circuit can be designed...
In the figure we have the way to use a common operational amplifier for AC signals. The resistor...