Most digital multimeters have a sensitivity of 200 mV and in input impedance of 10 MR. With this information you can calculate that at full scale there will be a current of 20 nA (nano-ampères). In ...

The Xpose is significantly smaller – about 30% lighter - and better priced than any other density meter currently on the market. Developed in 2012 and thoroughly field tested, it incorporates all the ...

I recently built a simple electromagnetic field (EMF) detector based on a code by Christian Figge that I found on the web. My design includes a 10-LED bar graph (from eBay), which I used to display ...

Testing for failure with a multimeter is only partially effective, whereas a dedicated optocoupler testing circuit provides clear results in just seconds. For related tutorials and step-by-step build ...