wondering if i could get some help with my little project.
i would like to control the speed of my super 8 projector with the PWM output of my Arduino.
here are some specs written on the back of my projector:
volts: 240 V
A.C. 50.60 Hz
LAMP 8v 50W
After some initial research i've built a little test circuit that succesfully powers a little D.C. motor (salvaged from a cassette player) from my arduino uno.
The circuit i used is from this youtube tutorial (http://youtu.be/hcpqt-BREqI
) but instead of the a potentiometer, i am using a PWM output from the arduino (controlled by max/msp) and instead of the transistor
i am using a power Mosfet. this one in particular http://www.rapidonline.com/Electronic-Components/Stp4nk80z-Mosfet-To-220-800v-3a-47-0190
. I was told this would be essential to handle the 240V mains going through the projector.
but for now the power source i used for this test setup is a 9v battery.
I am now about to test this setup with the A.C. motor of my projector (instead of the little D.C. motor) and the 240V mains (instead of the 9V battery) before I do so I wanted to know the following things:
- for safety reasons, should i have an optical isolator somewhere in my circuit?
- Is there any difference in controlling the voltage of D.C. motor and an A.C. motor?
- Is there any essential components I am missing in my setup ?
If i am completely wrong, feel free to suggest me a better circuit for my setup.
Thanks a mill!