I have a fan (110 V AC) that I want to control the speed of.
I want to do this by periodically switching it on/off. Say, period of about 5 seconds; and the 'on' period can be controlled as 10-100% of this time. I already have a fan that has this built in, and it works great, silent too. Basically it's variable pulse width control of an AC appliance.
I probably need a thyristor / triac circuit for this, switching on the null-crossings. Would be nice if the period time could also be variable.
Searches on Google failed because I don't know what keywords to look for. Can someone help me out?
Thanks, E.