When [Kerry] wanted to measure some very small resistances very accurately he did not want to fork out the big bucks for a high end multimeter or a mico-ohmmeter, so he decided to build one himself… ...

Your choice of current depends on battery size. You calculate the sink current of this circuit as I TEST =1/R 19 ×[V CC ×R 18 /(R 4 +R 18)], where I TEST is the current you are testing and V CC is the ...

When working on simple DC systems, a small low-cost multimeter from the hardware store will get the job done well enough. Often they have the capability for measuring AC, but this is where cheap me… ...

Diode D1 and capacitor C3 forms the output rectifier and filter circuit. If possible, try to replace D1 with a UF4001 fast diode for better efficiency. Zener diode D2 sets the output voltage to near ...

This circuit provides different ways to measure the current-voltage phase displacement of a line-powered ac load. The classic approach for sensing an ac load's current requires a transformer or ...

As an alternative, a simple circuit based on a low-cost CMOS timer IC can also provide accurate high-voltage dc readings to 15 kV by means of direct measurements.