This circuit was obtained in a French documentation from 1981 and can be easily assembled. The analog instrument itself can be replaced by the current scale of an ordinary multimeter.
This circuit serves as a power stage for the CMOS alarms and oscillators given in the previous...
This circuit is a four-quadrant multiplier using an LM3900. The circuit was found in the July 1988...
This interesting circuit, found in a 1997 documentation, allows you to view the characteristic curves of...