Tagged Questions
0
votes
1answer
336 views
Current Transformer with pic16f877a
I am currently working with a current transformer (CT) to measure the load current of a system. I am connecting the CT with a pic16f877a microcontroller using a basic circuit I found on the internet. ...
2
votes
1answer
163 views
Opamp topology without a stable voltage reference
I have an opamp configured as a constant current sink like this:
As you can see, the reference voltage for the SENSE pin is set by the voltage divider on the left. This requires a stable voltage on ...
3
votes
1answer
661 views
ACS758 current sensor output voltage cannot be read by Arduino
I have two ACS758 current sensors, specifically the 050B and the 200B. I want to monitor the current coming in to and out from my buck converter circuit. I attached the output of the ACS758 directly ...
2
votes
4answers
381 views
How to shift differential signal to read with single ended adc?
I'm using a current sense resistor (0.02 ohms) for a high current battery monitor for a hobby project. I'd like to shift this to a 0-5 V range to monitor using an ADC input (single ended.)
I ...
1
vote
1answer
112 views
Need to know the exact values for sense resistor, resistors in op-amp and power supplies
I am computer scientist and I don't know much about electronics.
In my master work, I have to design a circuit that measure the energy consumption of receiving single tweet from mobile ...
10
votes
2answers
186 views
Why do some of my IE converter circuits have a large offset voltage?
The following circuit is an active current to voltage converter with switchable gain.
Schematic
Not shown: The inverting input is held low through a 10K resistor when the circuit is powered on but ...
4
votes
1answer
376 views
Measuring input current of opamp
I want to measure the current that goes into a noninverting opamp input. I've setup my experiment as follows:
I can't measure the voltage drop across the 10M (R1) resistor directly since my DMM has ...
2
votes
1answer
617 views
How do I invert the output of this current sensor using the other side of the LM358?
Referencing a design that uses a more expensive OpAmp, I have put together (in simulation) this current sensing circuit that uses one half of an LM358. I would like to use the other half of the LM358 ...
-1
votes
1answer
300 views
Finding a current sense differential amplifier [closed]
I want to measure the voltage drop across a shunt resistor, amplify it to 50 times the original value, and feed that (0 - 5 V) to an ADC. I'd prefer to do the "high side" current sense method (rather ...
