# Automatic rise up tension

Discussion in 'The Projects Forum' started by silvajq, Apr 29, 2010.

1. ### silvajq Thread Starter New Member

Apr 14, 2010
7
0
Hi everybody,

Im working on one simple circuit, the objective is to control on AC tension of 12v trough a potentiometer and apply on load at the exit of the circuit, and control the current depend on the load that we put on the exit. (you can see on the attach circuit).

Now Im control the tension trough the potentiometer, but I would like to have the control in the automatic way (rise up ramp). For example when I push one button the tension goes from 0 to 12v.
Its possible to do it, or there are any IC that make this?

Silva

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2. ### Audioguru Expert

Dec 20, 2007
10,897
1,245
Translations:
Tension is voltage.
Exit is output.
This simple circuit wastes a lot of power making heat.

3. ### beenthere Retired Moderator

Apr 20, 2004
15,808
294
Can't you use a voltage regulator like a 7812?

Apr 5, 2008
19,267
3,887
Hello,

The problem is you want to regulate an AC voltage.
You could use a variable transformer (VARIAC) before the 12 volts source.

Greetings,
Bertus

5. ### silvajq Thread Starter New Member

Apr 14, 2010
7
0
Ok, but i want to do it in automatic way, i don't want to make the variation by hand

6. ### hobbyist AAC Fanatic!

Aug 10, 2008
885
87
Hi,

This is not designed for AC voltage,
however this is a quick circuit concept of how to raise or lower the voltage output across a load, using 2 buttons.

I built it and put a analog volt meter across the 10K resistor, and I was able to get excellent lineararity in increasing and decreasing the voltage, by tapping a button the meter had nice slow movement, where I could vary the voltage in steps of 1/2 volts at a time both up and down, or hold the button down and get continuous linear meter movements.

This is only working for DC volts, but the concept is there to get something started in your design direction.

kingdano likes this.