Electronics > Repair
component from 80s unkonwn need help
Von_Was:
i have tried to measuring it a little
tried to figuring out what it's and i believe its broken , but i don't know what its for sure , but i believe it might be a transformer of sort.
i believe 1 side is Primary 1.8k ohm, and the other side might be a broken 2th dary beaus i got noting that i can measure there , but i'm not sure what its , it might be an broken inductor.
visual inspection reveals a red dot ,pretty sure its for orientation purpose.
its from a battery 6/12 /24v charger by Bima
from appers to be -86
i don't know if i ever seen one of this components before in 20 years
and i don't know what the 4k stands for ,
P.s ignore the solder splash , tho that is equally confusing to me but a really easy fix.
thanks in advance //Von_Was
edavid:
It looks like a "Vactrol", which is a type of opto-isolator or voltage controlled resistor:
https://en.wikipedia.org/wiki/Resistive_opto-isolator
coromonadalix:
same tought, seen only once, now twice
optically controlled resistor .... 4k when lit or 4k at no light, not sure about variable value ??
you have a trimpot ...
can you do a gross schematic ??
schmitt trigger:
Most likely a Vactrol.
Unfortunately, it is of the incandescent lamp control variety, the filament could have burned out and that could be the potential reason for an open-circuit resistance measurement (if I understood your post correctly).
Von_Was:
thank you edavid , coromonadalix , schmitt trigger
i will read about the Vactrol ,
i will do a full mathematics, i don't know how long ti will take , maybe a day or 3 , depending on whats going on , but i will goood enuth i hope , started lerning Ki-cad yesterday , so i hope to be able to simulate it whit Lt Spice , when i figured that one out. i will post results when i have tested the component , in different voltage corresponding to resistance. probebly only a few mesurements , becus maybe 5 just to get somtfing to go on (if it works) else i will tear it apart and see if i can replace the fullty part. and try to capture it on video.
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