-
If you enjoy the forum please consider supporting it by signing up for a NES Membership The benefits pay for the membership many times over.
-
Be sure to enter the NES/Pioneer Valley Arms February Giveaway ***Smith & Wesson SD9VE 9MM***
Interesting Nerdy Pictures and Videos Thread
- Thread starter ToddDubya
- Start date
you've got me. i guess the capacitor first forces the diodes to put a LOT of current thru to charge them up on the first cycle. the inductor does the opposite, resisting current flow change. So the diode only puts out a smaller amount of current to charge the other side.
but why they think the voltage will be 1/2 is not obvious to me. let me look into it further. it could just be bullshit
NHCraigT
NES Member
The calculations to direct torpedos from a submarine are pretty complex.
The WWII German TDC (Torpedo Data Computer) got a reputation for being sophisticated for a simple reason: all their technology was disclosed in detail after WWII. The American TDC used a mechanical analog computer, but remained classified for decades.
View: https://youtu.be/2JjXiWJ2IrI
The WWII German TDC (Torpedo Data Computer) got a reputation for being sophisticated for a simple reason: all their technology was disclosed in detail after WWII. The American TDC used a mechanical analog computer, but remained classified for decades.
View: https://youtu.be/2JjXiWJ2IrI
since we are on power supplies, here is a good explanation of Power Factor:
View: https://www.youtube.com/watch?v=eI_LQWrQam4
ToddDubya
NES Member
Great timing on the rectifier video. I came down to the kitchen this morning and I'm like "Hmm, I think I hear a switch mode power supply about to fail". I look up and one of the compact fluorescent bulbs in the light is out. It comes back on with a tap, which tells me it's just about done.
Maxrobot
NES Member
Now I know the difference between a stillson and a monkey wrench.
View: https://www.youtube.com/watch?v=tQsKvmDExxc
View: https://www.youtube.com/watch?v=tQsKvmDExxc
NHCraigT
NES Member
ToddDubya
NES Member
A brief explanation of different types of inductors and their uses. I was just reading this morning about them and was trying to learn when you'd use air vs iron vs ferrite. As luck would have it, I just came across this tonight.
View: https://x.com/ElecNotes/status/1885331148961632323
View: https://x.com/ElecNotes/status/1885331148961632323
the brits invented the magnetron. but it was a swiss watchmaker's nightmare. super precision machining, and if it was just a little off it would not oscillate.
The brits sent a few over here to USA to figure out how to mass produce them.
Vanavar Bush figures out if he punched metal sheets out, stacked them together, and sintered them together in a vacuum oven, that he could get the internal structures pricise enough but with mass production techniques.
And, hence, Raytheon company was formed. a hundred thousand were produced in Waltham during the war
they still had a microwave vacuum tube manufacturing operation in Waltham up until the early 1990's
in the 1950's, the radar technology developed at MIT was finally declassified, and a series of books, called the MIT Radiation Lab Series, was published describing all the technology developed during WWII on microwave energy. The technical detail was so good, i actually used some of it desgning modern missile radars in the 1980s.
interestingly, the Russians, who did not have the semiconductor technology we had, continued to pefect the vacuum tube technology up until the late 1990s. it was amazing to see an entire russian missile radar using mostly vacuum tubes instead of Integrated circuits. and being vacuum tube, it was IMMUNE TO EMP PULSES.....something we struggled with
Last edited:
Good stuff...this I learned in Navy advanced avionics school but it has been 50 years since I learned it. I ended up designing switched mode power supplies and while there are some similarities (harmonic filtering etc), receivers are quite a bit more complicated (to some degree).
ToddDubya
NES Member
Pretty neat demonstration of a few soldering techniques. And I didn't know that the balls on a BGA melt. It makes sense, but the only experience I've had with them they had spring loaded pins/cups that they'd contact. Maybe that's old or maybe it's different techniques.
View: https://www.youtube.com/watch?v=m3Ny3j5nH0U
View: https://www.youtube.com/watch?v=m3Ny3j5nH0U
Makes me wonder why they kept making them out of brass then?
'cuz "cold enough to freeze the balls off an aluminum monkey" just doesn't have the same panache.
chris_1001
NES Member
