Using the 741 this circuit can be adjusted to values between 1 Hz and 100 kHz. The power supply must be symmetrical. We found it in the Radio Electronics magazine of November 1973.
Other operational amplifiers of the same series can be used on this circuit found in Motorola's Linear...
This circuit uses a capacitor to store energy. The capacitor is charged by closing S1 by a moment. Them,...
Other amplifiers of the series like the MC3301, MC3401 and LM2900 can be used in this circuit. We found...