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COOL triac circuit

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subzero349

New Member
Ok... I found this circuit that controls the phase of an ac light or dimmer using an opto-isolator.... I attached it... but I don't know if it's viewable... here's the link: http://www.electro-tech-online.com/custompdfs/2003/07/AN-3006.pdf (figure 3)

I just had a few questions I was hoping somebody could answer...

1. Does VR1 control the speed of the motor? If not, what does?

2. Ok... is there any way to send a control signal into this thing as well? What I mean is this circuit can control the speed of the motor, but can I have my microcontroller decide whether or not the motor is on or off? Does this make sense? I want to make my microcontroller decide whether the motor is on or off, and I want the VR1 to decide the speed of the motor if it's on...

any help would be greatly appreciated
 

stevez

Active Member
FYI - generally the rpm of an AC motor is not voltage dependent though there are some exceptions - the universal motor mentioned is one of them. Just wanted to warn you in case you wanted to apply to another kind of AC motor.
 

subzero349

New Member
thank you... I plan on using this circuit for small universal motors or light bulbs... can you offer any suggestions?
 
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