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### Topic: 10v PWM (Read 1 time)previous topic - next topic

#### Sandeep_Raj

##### Feb 24, 2010, 02:11 pm
Hey..In the PWM for fade in and fade out, I need fade in and fade out a 10v bulb, its not possible to directly get a 10 v supply from the controller..is there any other IC which i can use to get that?

#1
Err...

#### PaulS

#2
##### Feb 24, 2010, 02:41 pm
Quote
Err...

Err... what? Err... as in "Never mind"? OK.

#### Sandeep_Raj

#3
##### Feb 24, 2010, 02:47 pm
No..I sent Err.. Coz i tot that this question is silly.. But really am stuck.. AM a beginner..

How can i do that??

#### kg4wsv

#4
##### Feb 24, 2010, 03:19 pmLast Edit: Feb 24, 2010, 03:20 pm by kg4wsv Reason: 1
Use a transistor to turn on the 10V bulb. See examples for driving motors, etc.

This tutorial on the playground shows the circuit.  You'll place your 10V bulb where the solenoid (L1) is, and you won't need the diode D1.

If your bulb doesn't need much current, you can probably get by with something small like a 2n2222.

You can apply PWM to the transistor.

-j

#5
##### Feb 24, 2010, 03:31 pm
Hello

are you using one of those dimmers that work with a voltage from 0 to 10v or an actual 10v bulb?

If you're using a 0/10v dimmer you just need to create a small amplifier using an op-amp that will multiply the 0-5v of arduino to 0-10v needed (the amplifier would have to be powered at 12v)

see the circuit at http://en.wikipedia.org/wiki/Operational_amplifier_applications#Non-inverting_amplifier
if R2 is the same as R1 (let's say two 10k resistor) you get a x2 aplification factor.

You could use an LM358 as an opamp.
I've used this circuit to control fluorescent lamps multiple times and it works

m

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