Re: [CAD_CAM_EDM_DRO] 0-5vdc converted to 0-10vdc on the cheap

Fred Smith wrote:

>I have a control signal that varies from 0-5vdc and want to use it on
>another device that needs 0-10vdc. Fast control response is not
>required.
>
>Available power is 5vdc and 12vdc both regulated.
>
>A solution that fits home-hobbyists budgets is required.
>
>What kinds of solutions can be used?
>
>An LM317 variable voltage regulator might be a possible solution
>(certainly cheap).
>
>Is there a ready to go solution already available?
>
>

I think this would be difficult with just a regulator chip. An OP Amp
is the tool of choice. Use a rail-to-rail op amp if you really need to
go all the way to zero. Or, power the op amp from +12 and -5 or -12 V,
so it can deliver zero volts when needed.

The circuit would be to connect the 0-5 V input to the + input of the
op amp. Connect a 10 K resistor from the output to the - input.
Connect another 10K resistor from the - input to the signal ground.
The output will now swing from 0-10 V as the input goes from 0-5.
You may need a small capacitor, say 100 pF in parallel from output
to - input to stabilize the op amp.

Jon