Re: [RFI] Radiant floor heating

[Jim Brown <jim@audiosystemsgroup.com>]

On 1/3/2011 1:01 PM, tuxman wrote:
>
>> More likely triacs like those used in light dimmers. BEFORE BUYING,  I
>> would make sure that they are of the zero crossing type.
>>
>> 73, Jim K9YC
>>
>
> what are "zero crossing"??

The controller pulses the AC power on and off at the instant when the 
sine wave crosses zero volts.  This minimizes the switching transient in 
resistive circuits (and thus minimizes the noise).

73, Jim K9YC
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