Are there stripes around the bodies of the devices?
Are there stripes around the bodies of the devices?
-- John Fields
This might be the weirdes questen here.... Well I picked up a miex lot of components and it has about 5-6 Zener Diodes... (thats what i think they are) Well the problem is they are sooo tiny and hence I cant read the values.. is there a way I can find out the values? I mean ID the diode.... Now that I think of it... are they even Zener diodes? I know 1N914 comes in glass case too... Is there a way I can find out what this is and what values it holds....
in
"Ronak Shah" wrote
Get a good ~10x magnifying loupe: Things will just get even tinier and harder to read; Eyesight gets worse as one gets older, not better.
-- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. Remove spaces etc. to reply: n o lindan at net com dot com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
Hi, Shah. No weird questions here. If they're in a glass case, they're probably either signal diodes or zeners. If they're zeners you can usually tell the wattage by the size (400mW zeners are smaller than 1W zeners). The tiny ones are usually the 400mW ones.
One thing you might try is cobbling up a 30V power supply, and putting the back-biased diodes (Device Under Test, or DUT) in series with an appropriate resistor. If they're standard diodes, all the voltage will be across the diode. If they're zeners, there will be a zener voltage across the diode, and the rest will be impressed across the resistor. Note that this will not be a good solution for higher voltage zeners (they will look like standard diodes) or schottky diodes (which can break down at 20V, depending). But, if the choice is between standard silicon signal diode or low voltage (less than 24V) zeners, this will give you a pretty good start.
Remember to start with a higher resistance value to avoid smoking the zener, and after getting an initial indication of zener/avalanche, choose a more reasonable resistance to test at something like half rated wattage. (power = volts * current).
___ .--|___|---X----. | R | | | | | --- DUT - -30VDC ^ | | | | '----------X----' created by Andy´s ASCII-Circuit v1.24.140803 Beta
Good luck Chris
I took some advice and got my self the magnifying glass.... well I can see the following digits.... on the first one
1N8 14B Con the second one: TFK
1N4 < Not very clear 733 < 7 is clear the rest I guessed from the blurNow I cant see the numbers clearly.. so I am guessing these numbers... does anyone recognize these????? If you do... are these zeners or regular signal diodes?? If not do these numbers resemble anything you might recognize ?
I am kinda new to this.....please advice
This might be useful:
This list may give you an equivalent type that you can find on Google.
That said, the second one is a current type and is on this data sheet:
-- John Popelish
My guess would be:
Glenn
I suspect that is a 1N914B - common small-signal diode.
1N4733 is a 5.1 volt zener, 1 watt-- Peter Bennett VE7CEI email: peterbb4 (at) interchange.ubc.ca GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html Newsgroup new user info: http://vancouver-webpages.com/nnq
A method I use is similar to Chris Foley's, only simpler if you have a scope. Just put the unknown device in series with a resistor (100K or so) and connect to the AC output of an appropriate transformer.
Look at the voltage across the diode and see what it does. You can see the Zener voltage as a clipped half-sine in the reverse-bias direction. You can thus read the Zener voltage right off the scope face. This makes it quick to characterize lots of unknown parts, including telling which end is which.
Hope this helps!
Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis
1N8148. Sounds _almost_ like an 1N4148 (Si universal diode); those in my stock are labeled in the same fashion.
Cheers + HTH,
- Joerg
-- joerg dot hau at swissonline dot ch * Lausanne, Switzerland http://homepage.sunrise.ch/mysunrise/joerg.hau/ "All standard disclaimers apply". remove the obvious from my address to reply
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