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.
This preamp version uses BC109 transistors that are older versions of the current BC549 in plastic...
This circuit was obtained in a technical documentation from the 70s, but it can be assembled with...
This stepper motor control was originally designed to use a PC's parallel port and is quite simple...