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AC/DC Microammeter Circuit

2015-03-03 19:26  
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AC/DC Microammeter Circuit
This is a take-off on Mr. Marian’s “Simple Micro Ampere Meter Circuit” that utilizes active circuitry and an analog meter to make sensitive DC current measurements. A reader subsequently asked if it could measure AC microamperes and that is what spawned the idea. While the schematic is similar, there are notable differences—the voltage drop is now 100mV rather than 1V, the sensitivity is 10nA full scale rather than 100nA and it now measures AC or DC. A precision rectifier rectifies the AC voltage so that a DC meter may be used. Microammeter Circuit Schematic