.7 Volt diode drop

[wetwilly45]

Hello all, Im currently working try to take current measurments off of several motors and etc. I have a Hall effect current sensing ring that was found cheap at digikey. Problem being tha the unit that recieves the input on this unit will only accept a DC input so we installed a diode and a cap to rectify the voltage but the .7 volts that are being droped is too much of my signal as it is only 4.7 volts to begin with any suggestions

 

[MacGyverS2000]

Can you just put in a low-ohmage resistor and measure the voltage across it?

Dan - Owner

http://www.Hi-TecDesigns.com

 

[itsmoked]

Schottky diode 0.4V ?

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[Skogsgurra]

A precision rectifier is discussed in this thread240-105753

Gunnar Englund

http://www.gke.org

--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[ScottyUK]

Hall Effect sensors are available with a DC voltage or current output proportional to the rms value of the primary current. Why not just buy the right device for the job from the start?


----------------------------------

Sometimes I only open my mouth to swap feet...

 

[logbook]

... or failing that use a resistive network to level shift the current so it is always positive.

 

[wetwilly45]

Logbook how would this work?