Used in radio reception, this circuit was found in the February 1983 Radio Electronics magazine. The integrated circuit is the NE570 IC, and the power supply is 3.6 V.
In the figure we have a second order filter with very high input impedance, using an operational...
This circuit that can be activated by light or heat was found in an old American documentation, but the...
This interesting circuit, found in a 1986 publication, includes a powerful audio amplifier. Being...