In the figure we have an IF amplifier step using a MOSFET. The circuit was found in a 1980s documentation, intended for FM receivers of the time.
) This interesting circuit of 18 multiplexed LEDs was found in the February 1992 issue of Radio...
This 1969 Philips documentation circuit makes it possible to control an engine through the sound...
This circuit can operate with 5 uV to 1 mV input signals from low impedance sources such as...