This circuit with a differential pair was found in the August 1974 Radio Electronics magazine. The frequency is determined by L1 and the variable capacitor.
This 2-CK722 oscillator was found in a march 1961 Radio Electronics Magazine. The circuits need...
The two circuits we suggest are from the book Optoeletronics - Theory and Practice by Texas...
This interesting configuration of optical triggering using an oscillator was found in a 90s...