Opto-Isolated-Input 4-Digit Voltmeter
![](https://freecircuitdiagram.com/wp-content/uploads/2010/11/4-DIGIT-VOLTMETER-WITH-OPTOISOLATED-INPUT.gif)
The voltage that control a V/F converters will be displayed if we use a frequency counter, which is directly proportional to the input voltage. A 1 second time base will give 4 digit resolution with 1 reading per second when the V/F converters is running at 10KHz full scale. To transmit the frequency, we can use the optoisolator, so there […]
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