Some fun on Thanksgiving 2019 - taking a look at a couple of really neat digital meters I got from the University of Pennsylvania Haul. One mechanical - one LED - Both digital! Really! Enjoy!
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The original video of the U of Penn Haul - https://www.youtube.com/watch?v=_znnfw0tQFc
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Join Team FranLab!!!! Become a patron and help support my YouTube Channel on Patreon: http://www.patreon.com/frantone
The original video of the U of Penn Haul - https://www.youtube.com/watch?v=_znnfw0tQFc
- Music by Fran Blanche -
Frantone on Facebook - https://www.facebook.com/frantone/
Fran on Twitter - https://twitter.com/contourcorsets
Fran's Science Blog - http://www.frantone.com/designwritings/design_writings.html
FranArt Website - http://www.contourcorsets.com
Its good to know that I'm not the only one into TTL's!
The wires arranged in proper rainbow order is perfection.
Hola Fran, y los Subtitulos?
I swear Fran is the Bob Ross of vintage electronic gadgets. Love your channel keep 'em coming!
Reverse engineer that voltmeter!
It's so simple inside…
I designed a digital voltmeter, but it uses WAY more logic gates…
Still partial myself to the deeper red of the 70's LED tech.
I'm surprised that this is the first time I came across your channel. You are really cool!!!!
years ago i got a precision air regulator by fairchild. i used it to pressurize air tanks at a Very low pressure. 2 psi or less
NTSC M color subcarrier crystals were used in many devices back in the old days. I still have one in my old crystal box.
The light blue Mepco-Elektra precision resistor is nice, .from a time when metal film resistors were rare , and none were made in China. The long axial lead capacitors are not film caps, they are tantalum capacitors. They have a value much too high for film process, one of them is 10uF.. Because designers were weary of the lifetime problem of electrolytics, tantalum was often used in their place in instrumentation. A nice construction detail is that the logic section and the analog section are on two different PCBs and that the amplifier opamps are industrial grade "200" series, the higher grade versions of LM301. Although the compensated LM741 opamp had already been released, it was customary in instrumentation circuits to continue using the 301 uncompensated opamp, and retain the ability to provide application specific external compensation. And the frequency of the crystal is the colorburst frequency used in color TV chroma demodulators, so it was the most cheaply available. frequency did not really matter here, since the logic board divided it any way it wanted, and it was only used to determine sampling time, the result being adjusted by the calibration multi-turn pots anyways..
I'm kinda wondering what fran's toy drawer looks like now.
Thanks for you! 🙂