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Digital Amperimeter |
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This circuit consist in two integrated circuits. One analog to digital converter (CA3162), and one decoder of seven segments (CA3161).
The power supply is 5 volts c.c. and only has two settings, R2 - 47k serves to put 0 in the displays .
For do this, we conecting the wires between in the entry and turn slowly R2, until read 0-0-0 in the displays.With the resistor R1 we wil calibrate the current.Later we will see their adjustment. The circuit is designed to integrate it into our power supply. To do this
This is the scheme.
Between the points of R1 we will extract two wires that will go at the entry of our amperimeter.
Take a look.
The value of that resistor will give us the full scale of amperimeter. With a resistance of 0.1 Ohm will have a scale of 0 to 10 Amperes. And with a 1 ohm resistor the scale is 0 to 1 Amperes.
The resistor must be 5 Watts and 1% tolerance.
The scheme.
The circuit.
The diagram and the circuit must be in the same folder, just change the extension to the scheme (sch) and the board (brd). In this folder the scheme and the board are recognized by the Eagle.
To calibrate the amperimeter, put a load on the terminals of the power supply and measure their current with a tester. Turn R1 until to read in the displays the currrent we're measuring with the tester.
A picture of our amperimeter in one of our power supplies.
This power supply has a digital voltmeter (red) and digital amperimeter (green).
If you don´t have to make a printed circuits click here.
