This circuit was obtained in the 1990 Motorola Linear Databook. The circuit uses a 139 series comparator, but other series can be used. The power source need not be symmetric.
In figure 1 we have a circuit that turns on after a certain time and then turns off, also after a...
This microcircuit that fits in an aspirin box was published in Radio Electronics magazine in...
This is an amplifier that uses a pickup coil placed next to the telephone set and the listening is done in...