Wattmeters voltmeterIn order to give you an idea of what we consume appliances, here I present to you a meter with a voltmeter incorporated.
As you can notice at the entrance is made use of 2 diodes (2 amps 400 volts), contradictory to allow a positive cycle and the other negatives of the alternating current, this means that in making out there will always be alternating current .
The 3-ohm resistor is responsible for controlling the power in the indicator, for example:
If you place a resistor of 47 ohms, the maximum power to endure the indicator will be 200 watts. The 820-ohm resistor is responsible for limiting the voltage to receive the indicator, which will be part of volts and not to damage the potentiometer (mini) is responsible for the adjustment on the cover of the indicator.
List of components
D1, D2, D3: 1N4005
2 milli ammeters from 0 - 200 µA
pcb expensive components print
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