Simple circuit to measure small currents
This project was inspired by Micro Current Gold project, but this is simpler, budgetory version.
- High gain
- Three measurement ranges (10uA, 10mA, 1A)
- Low voltage offset
- Possible voltage offset compensation
To start, just use gerber files to order your own PCB, and order parts from BOM file. Device is powered by two 12V (MN21) batteries.
Use SW3 to switch ON device. Adjust current range using SW2. To read current you can use voltmeter, or oscilloscope. To calculate current, use table below:
| Range | Max current | Voltage | Current |
|---|---|---|---|
| nA | 10uA | 1mV | 1nA |
| uA | 10mA | 1mV | 1uA |
| mA | 1A | 1mV | 0.1mA |
2021-04-06 V1.0 First version
