This circuit, from the 1990 Motorola Dataar Databook, can use any LM139 series comparator. The circuit must be powered by a symmetrical power source and the formula for component calculations is next to the diagram.
![](/images/sampledata/cir/CB4007E4_0001.png)
This circuit, from the 1990 Motorola Dataar Databook, can use any LM139 series comparator. The circuit must be powered by a symmetrical power source and the formula for component calculations is next to the diagram.