High Voltage Transistor Voltmeter (CB1403E )

daptation of a common multimeter for the measurement of high voltages with high input resistance, avoiding errors of readings by the instrument load. The transistor can be a BC557 and the instrument can be the current scale of a common multimeter. The 200 M ohm resistor at the input can be obtained by connecting resistors of lower values in series, for example 10 22 M Ohms resistors.    This circuit allows the a

 


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