The circuit shown in the figure can be designed with more modern operational amplifiers, as it is from 1994 documentation by National Semiconductor. The power supply must be symmetrical.
This circuit that emits siren sound can be used in a fire alarm. We found it in an old American...
The filter shown in the figure, suggested by National Semiconductor, only allows frequencies above...
This full wave source uses germanium diodes, and its current is a few milliamps. We found it in an...