StudentSA
Member
I need to have an adjustable voltage "signal". This is fed into a IC that uses it as a referance for comaprison. What has confused me is that I have biased my trim pot (50k) with 12V.
I have 12V and ground at the end terminals. I then use the wiper pin as an output and adjust the output signal level using my multimeter. Lets say I set it to 8.5V.
However when I connect the "wiper" pin to my IC (Input Pin) all of a sudden the voltage drops to like 3V and I need to readjust the wiper to get it to 8.5V again.
Why does this happen? Any advice is appreciated...
I have 12V and ground at the end terminals. I then use the wiper pin as an output and adjust the output signal level using my multimeter. Lets say I set it to 8.5V.
However when I connect the "wiper" pin to my IC (Input Pin) all of a sudden the voltage drops to like 3V and I need to readjust the wiper to get it to 8.5V again.
Why does this happen? Any advice is appreciated...