Tagged Questions

4
votes
1answer
89 views

Measuring very small changes in resistor network using current source

I am trying measure a very small change in resistance (approximately .400 Ohms), due to the the effects of connecting a large resistance in parallel with a network of smaller resistors essentially ...
1
vote
3answers
102 views

Selectable Voltage Divider Optimal Switching Point

I've built a circuit to measure an unknown resistance (over a large range) which is basically the following: simulate this circuit – Schematic created using CircuitLab Range_Select_1 and ...
4
votes
3answers
188 views

Resistance to Digital converter

I am trying to make a digital ohmmeter on a parallel port interface that can measure resistance with at least 95% accuracy. I have tried a 555 timer monostable assembly which generates a pulse with ...
0
votes
0answers
120 views

Is there an out-of-the-box solution for measuring low resistances?

I have a microprocessor project where I need to measure resistances between .1ohm and anywhere above 10ohm and I need to do it about 1000 times per second. Guessing from the number of tutorials I've ...
1
vote
3answers
670 views

How do electrical body fat detector work?

I would like to build me own electrical body fact calculator from a microcontroller (the Arduino), but I would like to know how does it work. I have a 5V analog reader, So I guess I sould calculate ...
4
votes
4answers
1k views

Precise Resistance Measurement Techniques

This question is inspired by some basic questions on resistors I've read here lately. What's the most accurate/precise technique for measuring the value of a resistor you can think of? What level of ...
9
votes
1answer
989 views

How do you calculate the noise of an op-amp circuit?

I think I know how to do this, but you can find a lot of different instructions and calculators online that contradict each other. I have yet to find a clear, concise procedure for calculating the ...