#904 What a Diode looks like Inside?

Episode 904
Let's open up some diode packages.

[Gengh]

I never would have imagined that those capacitors were just Smd ceramics with legs and epoxy.

[SeanBZA]

Also bought on an auction 4 boxes of zener diodes. 40k zener diodes, half 12V and the other half 24V 400 mW type. So I have been using them as regular diodes where the voltage is low enough, and I only need 50mA of current rating. They are great on relay coils, use 2 in series, back to back, 12V on a 5V relay, and 24V on a 12V relay coil. Faster release time, just have to make sure the transistor driving the relay is rated over 60V Vceo, or take a gamble that a 30V rated transistor actually will only break down at over 40V in most cases, which is generally true with modern devices.

Forward bias them at 2A and they turn into light emitting diodes, after a half second or so, at least till the glass case melts. Got a whole string of them, forward biased, as the voltage regulator on some 2F supercapacitors, 4 in series across each 2F capacitor, to replace an old NiCd battery backup pack, so that you get a good enough emulation of the cells, as they are trickle charged. Self discharge of the capacitors is not a worry, as the battery is there for backing up a clock memory, and thus it will work for at least a day of no power. I got tired of replacing the NiCd cells every few years.

[vincei]

I've got a lot of AVX capacitors too. You hang around eBay long enough you stumble across killer deals. I have more HP SMD LED's than I'll ever be able to use in my lifetime, but for 20 bucks for partial reels it was impossible to pass up.

[Alix]

I wonder how much IR does it emit when it conducts🤔

[charlesdorval]

Very interesting as always ! Thanks ! :)

[ChrisSmith-tcdf]

I had no idea that the SMT diode tabs were flattened copper wire soldered to the die. I envisioned wire bonds in there as dinner other silicon devices packages use.

[lordrahulcool]

So many capacitor. I wonder what u will do with them?

[MrPinknumber]

I want to know how SC devices work and look, so I really liked this one. Good job :)

[subramanianr]

At 1.50, it's 1A diodes....
Thanks for the presentation
De VU2RZA

[MrPhantomFury]

Interesting ! Could that white goo be glass ? I mean, it's holding together even after the epoxy separation & still pretty shiny O.o

[frankowalker]

3:17 Is that why Diodes show a resistance value when you measure them ? LOL. (sorry)

A great look into how components are made. Thank you.

[-bitbitsa]

Is the white goop soft ? Beryllium Oxide paste was used in transistor packages BITD… deadly stuff 😳

[thrillscience]

I thought there was smoke inside of them.

[noureddinebenakrim]

Hello, I don't know why the 8051 cpu are not so popular, and no one makes videos about it