0-10 volt controller

Hi Don,

What do you intend to do with this? Do you need it to power something or do you need to provide a slow changing signal to another circuit or device? How slow is slow?

Am I correct in assuming you already have a 0 to 10 volt controller and just need it to change the output very slowly? In that case, I'd need information on your controller.

I'm not aware of a single-chip solution ('not saying there isn't) but I can think of a couple of ways to do this.

Hey guys.. this is an old fashioned way to adust the 0-10 volts DC signal, it takes around 7 minutes to go from a high of 8.18-8.37 vdc to a low of 3.72-3.84 vdc

It's not the time to reduce the controller voltage that I am interested it, that is fine and needs to be that way.. I just wondered if there a simple way to do this with an IC rather than the old fashioned way??

Thanks guys for the comments

Don campbell

PS... If I told you everything that's involved THEN you would have to DIE. hahaha

Ah yes, the old "I can tell you but then I'd have to kill you" phrase. I've used that also when someone asks me for details about my work.

No need to give every detail. Just what we need to give a solution. At least that way, we'd only have to be half killed .

Here's an old circuit I used to slowly vary the light intensity of a light controller for a movie theater (during the intermissions).

This is a single IC circuit (dual op-amp). Op-amp A is wired as an oscillator. You can vary the time by changing the value of R1. Changing the value of R2 allows you to change the minimum and maximum voltage.

Op-amp B is wired as a buffer. R4 and R5 are equal in value. The output of Op-amp B is where you get the varying voltage.

what you need is a function generator IC and choose the slow ramp and amplify that out put to give the range you want. You can make a sawtooth, that starts at zero and increases and then decreases to zero. You can make a cliff, increases to a max and drops to zero instantly. You can make a dual rate sawtooth. climbs ate one rate, drops at another.

Many ways.

http://search.globalspec.com/Industrial/ic_function_generator

You could use a digital to analog (DAC) controller or chip to drive the base of an emitter-follower (or use a power FET). Have a timer to count on the input of the DAC. Some commercial power supplies have remote inputs that are analog too, if you need lots of current.