We found this circuit in an English publication from the 1980s. The circuit uses current components and can be tuned for frequencies between 300 and 1500 Hz.
Three 4011 NAND gates and two more components - a resistor and a capacitor make this oscillator very...
A 25 mVpp applied to the input of this circuit produces in the output a 1 Vpp signal. The...
With this circuit it is possible to use a DC buzzer (not a transducer) as an extension of the...