This circuit allows you to vary the duty cycle without changing the frequency. An interesting application for PWM controls. The circuit is from a Radio Electronics magazine from July 1985.
This distortion circuit was found in an American publication from 1970. It can be assembled with...
This circuit was found in a 1978 English magazine. It is a configuration that aims to select the...
This medium wave radio must use a high impedance piezoelectric, crystal or magnetic phone and the...