Posted on Sep 4, 2012

Ammeter is a great addition to any Laboratory Power Supply as it will measure the current consumption and help you determine if there are any problems with the circuit that you are building or testing. This amper meter is capable of measuring the current consumption up to 10A with selected 100mA, 10mA and 1mA accuracy, and consumes only about 25mA of current. The ammeter is based on single ICL7107 chip and 3.5-digit seven segment LED display. Due to a relatively small number of components that the circuit is using it is possible to fit it on a small 3cm x 7cm printed circuit board.

Click here to download the full size of the above Circuit.

0.01 Ohm resistor should be made out of 1.5mm thick / 5cm long copper wire. 0.1 Ohm and 1 Ohm resistors should have 5W ratings. For highest accuracy it is recommended that the ICL7107 ampere meter module should be supplied with its own voltage supply.

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