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<blockquote data-quote="Long balls Larry" data-source="post: 534801" data-attributes="member: 57818"><p>Sad citam da je to normalno kod ventilatora sa reglulacijom, kao moj blauberg turbo 125g:</p><p></p><p><a href="https://www.icmag.com/ic/showthread.php?t=67823" target="_blank">https://www.icmag.com/ic/showthread.php?t=67823</a></p><p></p><p></p><p>Na drugom forumu neki tip ih Hr kaze:</p><p></p><p>Inline exhaust fans are AC not DC. In order to limit the speed of the fan you need to limit the voltage going to the fan. The speedster controllers (cheaper speed controllers) work by cutting the line voltage really really quickly to limit the voltage going to the fan. So you are running 120V to the fan, but you are stopping any voltage from getting to the fan 10 times every second depending on how you turn the dial (that's a figure I just made up).</p><p></p><p>The downside to this is that it will cause most fans to hum to some extent depending how many times a second you are cutting the voltage. The slower you want the fan to spin the louder hum you will hear since you are cutting the power to the fan a few times every second/millisecond. Often times, the hum of the fan can be louder than the fan. The quick stopping and starting of the motor can reduce the life of the fan.</p><p></p><p>Speedster: <a href="http://www.horticulturesource.com/product_info.php?products_id=1665" target="_blank">http://www.horticulturesource.com/product_info.php?products_id=1665</a></p><p></p><p>On the other hand, a variac controller actually changes the AC line voltage from 120V to whatever you specify without cutting power to the fan. This removes all hum completely. I purchased this unit for $61 shipped. My current fan is completely silent with the variac.</p><p></p><p>Variac Autotransformer: <a href="http://www.officebeyond.com/va-130-0300.html" target="_blank">http://www.officebeyond.com/va-130-0300.html</a></p><p></p><p></p><p>Da sam znao ovo nebi kupovao, nego bi uzeo standardni sa 2 brzine. cuje se to dosta glasno.</p></blockquote><p></p>
[QUOTE="Long balls Larry, post: 534801, member: 57818"] Sad citam da je to normalno kod ventilatora sa reglulacijom, kao moj blauberg turbo 125g: [URL]https://www.icmag.com/ic/showthread.php?t=67823[/URL] Na drugom forumu neki tip ih Hr kaze: Inline exhaust fans are AC not DC. In order to limit the speed of the fan you need to limit the voltage going to the fan. The speedster controllers (cheaper speed controllers) work by cutting the line voltage really really quickly to limit the voltage going to the fan. So you are running 120V to the fan, but you are stopping any voltage from getting to the fan 10 times every second depending on how you turn the dial (that's a figure I just made up). The downside to this is that it will cause most fans to hum to some extent depending how many times a second you are cutting the voltage. The slower you want the fan to spin the louder hum you will hear since you are cutting the power to the fan a few times every second/millisecond. Often times, the hum of the fan can be louder than the fan. The quick stopping and starting of the motor can reduce the life of the fan. Speedster: [URL]http://www.horticulturesource.com/product_info.php?products_id=1665[/URL] On the other hand, a variac controller actually changes the AC line voltage from 120V to whatever you specify without cutting power to the fan. This removes all hum completely. I purchased this unit for $61 shipped. My current fan is completely silent with the variac. Variac Autotransformer: [URL]http://www.officebeyond.com/va-130-0300.html[/URL] Da sam znao ovo nebi kupovao, nego bi uzeo standardni sa 2 brzine. cuje se to dosta glasno. [/QUOTE]
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