ha thanks very much rjvh

 

Hello, this is my first post. No, cemf from the motor wont affect your circuitry enough for you to notice, I suppose in theory its possible, but like I said, you most likely won't notice it. A quick statement though, why all the circuitry? This all could be accompished with a simple toggle switch (rated for 240). Theres no real "motor control" going on here-other than on/off (which I suppose is technically accurate-but motor control typically refers to alot more than on off). The little led is nice though..and it is kind of fun to tinker, but like I said, a simple toggle switch will suffice. If you really want to play around with motor control, use a small cheap P.M. (permanent magnet) D.c. motor and use your triggering circuitry to drive an scr (silicon controlled rectifier) to vary the speed of the motor-more complicated but alot more fun-especially when you get it to run right.

 

There some thing i don't think your getting here. A AC motor switches at the 50khz to 60khz of your supply. So it can't do any thing like a spike on a DC motor the the only thing that happens with a AC motor is it pulls a lot of amps when started. which can strain your supply till the motor starts. Thats why most AC motor have starting capacitors to boost supply voltage going to the motor and give it a current boost.And a DC motor spike because it gos from using power to making power which is like putting two battery's in series. You turn off a AC motor only thing that going to happen is you'll have more current.

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