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.
We found this circuit in a 1981 documentation. The circuit can still be easily assembled, as it...
This circuit was obtained in an old publication from 1979. It describes a simple low frequency...
This circuit was found in a 90's EDN. It can be implemented with either TTL or CMOS logic and used...