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Tech Head - The Technology Section
The Work Bench and Soldering Station
Metronic Dualis 441350 R108 value
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<blockquote data-quote="deltatango" data-source="post: 609608" data-attributes="member: 312296"><p>Well for now I have settled on 470ohm as a suitable value (one day I will find out its true value).</p><p></p><p>This was chosen by using a variable resistor of under 1K and checking the current through the zener, up to 7mA caused its power supply no problem in holding the feed voltage to it. </p><p>While 13mA started to make it fall fast, given this zener is 1Watt rated I thought it must pass a reasonable current so in true technical style chose 10mA as a round figure which is also a good level which ensures it is at a stable voltage point of operating. Checking that its feed supply voltage had only dropped a few hundred millivolts at this point seemed reasonable (you don't get owt for nowt).</p><p></p><p>Checking the resistor value with a meter which came to near 470ohm @ 50mW, so I hope this helps anyone else fix their unit, please note this is not the official value so any repairs are at your own risk (Just covering the bases).</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="deltatango, post: 609608, member: 312296"] Well for now I have settled on 470ohm as a suitable value (one day I will find out its true value). This was chosen by using a variable resistor of under 1K and checking the current through the zener, up to 7mA caused its power supply no problem in holding the feed voltage to it. While 13mA started to make it fall fast, given this zener is 1Watt rated I thought it must pass a reasonable current so in true technical style chose 10mA as a round figure which is also a good level which ensures it is at a stable voltage point of operating. Checking that its feed supply voltage had only dropped a few hundred millivolts at this point seemed reasonable (you don't get owt for nowt). Checking the resistor value with a meter which came to near 470ohm @ 50mW, so I hope this helps anyone else fix their unit, please note this is not the official value so any repairs are at your own risk (Just covering the bases). David [/QUOTE]
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Tech Head - The Technology Section
The Work Bench and Soldering Station
Metronic Dualis 441350 R108 value
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