Found in American 90’s documentation, this circuit generates 300 Hz depending on the capacitors used. These components can be changed to obtain other frequencies.
S-meter is a signal strength meter used in radio transmission. Also known as Strength meter, in this...
In the circuit of the figure, when pressing S1 the sound varies according to the value of R2 and...
This circuit was obtained from an American publication of the 80's. The integrated circuit is of the...