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Tech Head - The Technology Section
The Work Bench and Soldering Station
Any electronics experts here?
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<blockquote data-quote="Robbo" data-source="post: 522153" data-attributes="member: 256551"><p>I think what you have there (The LED- not) is a photo transistor. The more light that falls onto it the more current it allows to be passed from one terminal to the other.</p><p></p><p>Just like a normal transistor except that the base current is supplied by the light source.</p><p></p><p>So, I would have thought that the device could be replace by a resistor. The max current through the will be in the region of a few tens of mA. So the resistor should not be too low in value, in the region of 1k minimum I would have thought, depending on the voltage accross it.</p><p></p><p>Robbo<img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Robbo, post: 522153, member: 256551"] I think what you have there (The LED- not) is a photo transistor. The more light that falls onto it the more current it allows to be passed from one terminal to the other. Just like a normal transistor except that the base current is supplied by the light source. So, I would have thought that the device could be replace by a resistor. The max current through the will be in the region of a few tens of mA. So the resistor should not be too low in value, in the region of 1k minimum I would have thought, depending on the voltage accross it. Robbo:) [/QUOTE]
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The Work Bench and Soldering Station
Any electronics experts here?
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