Re: Timer on reduced-frequency circuit

[Jasen Betts <jasen@xxxxxxxxxxx>]

On 2007-08-01, Lacustral <lark@xxxxxxxxxxxxxxxxxxx> wrote:
> Sam Goldwasser (sam@xxxxxxxxxxxxxxxxxx) wrote:
>>Lacustral <lark@xxxxxxxxxxxxx> writes:
>
>>> I'm thinking of using a variable speed control and a timer in series.
>>> Would a timer have trouble with the lowered frequency electricity from the
>>> speed control?  WOuld an electronic timer run OK that way?
>
>>I assume you mean a common thyristor phase control, not one that actually
>>changes the frequency of the power, though the same comments apply.
>
> Probably.  A guy at an electric store said it changes the frequency, which
> sounded weird to me.  But no, it would be an ordinary speed control.  I
> vaguely remember reading about phase affecting power delivery in a physics
> book.

Some speed controls do (a device called a variable frequency drive),
but that is for large industrial motors, small fan speed controllers
just reduce the voltage that the fan gets.

Bye.
   Jasen