EEVblog #651 - Mailbag

Mailbag Monday
Coin Validator Teardown
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[mikeselectricstuff]

ER1400 was about the first nonvolatile memory chip - needs a 35V programming supply!

[FranLab]

VFDs are awesome - Yes!  Those 'Popsicle' LEDs at 16:00 are pretty cool too - never seen that particular case style before....

[BurnabyAlex]

20:30 hold down clip is asking to break off in a vibration environment to turn into a floating metal bit.
 24:30 - nice bag diving 

[JustinAlexanderBell]

I think a video on salvaging and powering VFDs would be interesting.

[nicknack]

I have an old vacuum display laying around - it would be awesome to see you make a recovery/hookup guide for them!

[ricoreyes]

Love mail bag Monday and the impromptu teardowns. I'd like to vote for a VFD episode, I have a few I've scavenged but I haven't figured out how to drive them yet.

[MrKaizen]

The 'Mark" output on the chopper amp is most likely for use with a roll chart recorder. The Mark output generates a little pulse when activated which makes the recorder pen move up and down quickly for about 1cm. This way you can mark the start of a new recording...

[redtails]

6:02 yeah it does look like an industrial device for monitoring fridge and freezer temperatures, where temperature needs to be maintained precisely 

[geeko]

Great mailbag! Love the new knife! I hope it remains a regular part of the show!

[walterharriman]

I have a massive VFD from inside an dead stereo I took apart once. I would love to know how to power the thing up and maybe even use it for something.

[jeanious]

On the pacemaker you can use those two wrist bands as ESD wrist bands since they have the same hook up button.

[UberAlphaSirus]

I would love a fundamental Friday on closed loop control, PID would be a mind bend as it goes much further than an op amp:D

[Kingofkeks]

I would very much like to see a separate video where you explain how to salvage and power a VFD.

[OneBiOzZ]

I would love to see a VFT video, last time i tried to drive one i got a nice pop and blew the heater! 
also common go for the full hour ... we wont complain XP 

[gqwerty]

Yeah the Florescent display in our car's dashboard for the millage went out at about 230, 000 miles

[thecooldude]

That's not a knife. THAT'S a knife!

[jenterl]

Dave, please do a separate video on the VFD and how to salvage and repurpose an old display. Thanks again for a great mail bag Monday.

[Lskaggs]

Great mailbag video!  The Eurotemp was pretty cool, I remember back in the 1980's we had temp readers like that one test equipment for the Dept of the Navy at NAS, Norfolk, Va.

[electronicsNmore]

Another Christmas on Monday video! Good stuff.

[llingnau]

At 28:00 the math for the "solar roads" campaign is still there on the white board, loved that video.