What the heck is this? Sais q101 next to a LED. So it is not an led.

Thread Starter

alex26i

Joined Oct 16, 2018
14
Hey, guys, I have never seen one of these before. anyone have an idea what this is. being used on a laser. Is it a type of crystal? Resonator? It is not a green Led as far as I can tell. I think it might light up.
 

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Thread Starter

alex26i

Joined Oct 16, 2018
14
Ambient Light Sensors, found it. 751-1056-2-ND
This is just so strange. My guess is it is to turn off the device if the case is opened up.
 

atferrari

Joined Jan 6, 2004
3,487
I recall seeing a design where once the box was opened, a photo transistor detected the light, setting a bit somewhere in a micro, acting later as an evidence of tampering. Medical equipment IIRC.
 
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MaxHeadRoom

Joined Jul 18, 2013
19,186
I remember a incident where someone mentioned that his portable radio would suddenly increase in volume if he opened the back of it in daylight.
The (old) radio used Germanium OC71 transistors that had a black paint case, if the paint came off, they acted as a light dependent sensor.!
Max.
 
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