There are specific gauges are of little use for most areas of electronics, but some are expensive and hard to find even Brazil. An example is the frequency meter AC line, it really is a measuring instrument of little or no use to most of us. We can use a frequency common adapting a cable, but for anyone working with inverters, UPS and generators, this is a primary tool.
Frequency Meter for AC line Circuit Diagram
Here a circuit meter AC line frequency super simple and easy construction that can measure the frequency of 10Hz to 100Hz at a voltage of 110 V to 240 V.
This circuit converts the sine wave output of the square wave 100k watt resistor and zener diode 1 watt 6.8V which may be a 1N3829A.
The medium is directly proportional to frequency, so it can be read in a 100mA ammeter (M1).
To calibrate the use of 60Hz known home network, set the pot VR1 to read 60mA.
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