Condensor Fan control

Has anyone heard of Condensor Fan control using single speed fan but using a 'wave clipping' technique to vary the fan speeds ?

What do you mean by 'wave clipping'?

All speed control modify the supply voltage / wave form in some manner.

Many of them use Triacs. Other forms use Hall Effect or stepping motors.

Some of the Japanese makers use a method that eliminates whole wave forms in a regular sequence.

You pays your money........
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Yes, it uses Triacs - but I'm not sure how that works except that it clips the waves.

So can I use a normal light dimmer switch to control a condenser fan ?

Thanks Marc - Is the Diac like a Diode ?

Thanks Marc - Is the Diac like a Diode ?

A Zenner diode will only allow a set voltage to pass. On a 12 volt zenner, any voltage above 12 volt will be denied. These are used where a set voltage is required, say in a power supply or as a reference voltage.

Quote:

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Originally posted by frank
A Zenner diode will only allow a set voltage to pass. On a 12 volt zenner, any voltage above 12 volt will be denied. These are used where a set voltage is required, say in a power supply or as a reference voltage.

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Let's me thinks to a varistor. Each tech of us has allways some varistors in his van.

On each power supply to an expensive device such as electronic thermostats, PCB's, electronic transformers for halogen lights.... we place varistors - which are very cheap (less then 1 € or 1 $) - to protect them for overvoltage.

It protects them also if the common (or neutral) fails for some reason (here we go again) in a 3 x 380 V +N.