I am new to your forum although I often read it and find great help.
I have a problem that I cannot resolve. I am using a 5A CT (1000:1) to measure 110VAC (50Hz) currents of 70 to 90mA which gives me a very small window (200mV in a 5V range) and I need to monitor this little window with a 10 bit ADC with some degree of accuracy and reliability. After many days, I ended up using a MAX368 audio amp and half wave rectifier to deliver the best DC result.
What I would like is to expand my small 200mV window to 2000mV biased at about 2.5V in order to be able to digitally track and react when the window is breached.
Please assist by suggesting aa additional DC amplifier that will expand my DC window./
Thank you for the responses.
Apologies, I meant 10 bit ADC! RMS, ave or peak, no matter. It's a DC output to an ADC.
Burden resistor has been optimized for best results.
40% is arbitrary! Gives me some lee-way for excess breeches of the window.
I want to expand my DC window to achieve the above "arbitrary" value.