#1664

Рет қаралды 4,022

IMSAI Guy

Күн бұрын

Episode 1664
old box given to me
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Пікірлер: 53

@bobdoritique7347 11 ай бұрын

Nice project for a restoration.

@TheTrashcutter 11 ай бұрын

a homage to ohmage

@edgeeffect 11 ай бұрын

Thats NICE! You put your finger on it when you said "art work".

@rickoneill4343 11 ай бұрын

That is a true masterpiece. Beautiful.

@sleibson 11 ай бұрын

Based on where you're located, the knobs, binding posts, and workmanship, I'd say this is an internal HP test jig from the 1960s made either for the lab or production engineering. The parts look like they're all from parts bins in lab stock at HP but that sort of soldering and free-flying wiring would never pass muster for a production product. Another clue: that missing name plate from the upper left corner of the panel looks like it once held an HP instrument badge.

@IMSAIGuy 11 ай бұрын

It does look very HP. Was confused when I first saw it

@sleibson 11 ай бұрын

We built a lot of internal-only tools at HP and this looks like one @@IMSAIGuy

@davidkclayton 11 ай бұрын

A selector switch of that many poles can be quite expensive

@KG4JYS 11 ай бұрын

"There ya go, good as new!" - Classic!

@Manf-ft6zk 11 ай бұрын

It looks very much like student DIY equipment from the 1960ies. Relatively much effort is spent on the outer design, the markings, and the complex switch. The resistors are mostly 10% carbon resistors, mixed with a few 5% types and at least one 1% type. Today one can get a 7-decades 1% resistor array for about 10$ and connect it to 7 cheap thumb-wheel switches for easy setting and reading. Unfortunately the wiring of the thumb-wheel switches is made in a way so that one has to solder 70 connections.

@johnwilliamson467 11 ай бұрын

Carbon comp there some drift there. 20% on a good day with those. Fun video.

@davebleamwa2bxy799 11 ай бұрын

I threw out all my carbon comp resistors: even the ones in sealed packages aged to +20%.

@Graeme_Lastname 11 ай бұрын

After a lifetime of electronics I honestly don't remember a single occasion where I needed one of these. Same goes for caps, inductors , or any of their ilk. 😄

@stephentrier5569 11 ай бұрын

I have a couple. They have been useful for working out what resistor gives a desired LED brightness and to help a kid get a hands-on understanding of RC circuits. But honestly I haven't had a lot of use for them.

@Graeme_Lastname 11 ай бұрын

@stephentrier5569 They seem like such a good idea. 😜

@TheDigitalAura 11 ай бұрын

That's so awesome. Beautiful yet janky as hell lol. I just ordered a new resistor box from China I'm tempted to review when it comes.

@airmann90 11 ай бұрын

Oh wow that really is a work of art

@lmamakos 11 ай бұрын

"art"

@airmann90 11 ай бұрын

@@lmamakos exactly. Lol

@danishnative9555 11 ай бұрын

Lol. A masterpiece at that.

@IMSAIGuy 11 ай бұрын

definitely 'post modern'

@Stevie_D 11 ай бұрын

If nothing else you have an interesting project box ...

@frankowalker4662 11 ай бұрын

Beautifuly made, nightmare to work on.

@Ni5ei 11 ай бұрын

I didn't expect to see that inside 😂 It's huge!

@davidjh7 11 ай бұрын

One idea for working on it if you decide to do so, is to note the position, but cut the vertical bus wires, which would be easy to replace, then disassemble the switch. That would free each individual wafer, and ring. Just a thought.

@Pixelwaster 11 ай бұрын

An E12 sub-box, send to me. I'll fix it, clean it up, and get a label for it. Leave the dings and signs of use because they add a je ne sais quoi. Love fixing older stuff, just mo longer have the room for the ship anchors. 😂 BTW, who dafuk is that fif, a bot?

@joepalovick1915 11 ай бұрын

Good video. Possibly you could buy a 5% 1W resistor kit to get most of the values. The kits are not perfect by any means but also aren’t very expensive.

@danishnative9555 11 ай бұрын

Now that's one for the Bone Yard. Not much to salvage either.

@simontay4851 11 ай бұрын

The rotary switches and the box are salvageable.

@leonerduk 11 ай бұрын

That construction style is almost identical to a capacitor and inductor box I'm making for myself. Though mine are only E6 across 4 ranges, rather than your E12 and 6.

@bartonstano9327 11 ай бұрын

Please restore, it would be a great video on restoring old equipment.

@soulrobotics 11 ай бұрын

Are the color wires of the gain selector related to the order of magnitude by which the desired "impedance" is multiplied? because they are ordered 1, brown, 2 red, 3 orange...

@Edisson. 11 ай бұрын

The rotary knobs and sockets look like they are from HP, but I don't know that they would make something like that. Nice day 🙂 Tom

@__--JY-Moe--__ 11 ай бұрын

I hope he wasn't invisible! impe-dance....dancing in our socks! always moving forward! -->---->---->---->---->---->---->-->

@andye2005 11 ай бұрын

Rather that try to get 1 of every value, another method would be to use 1W SMD resistors, and use 1R and 2R values for each decade so 5x 1ohm and 20 x 2ohm would make up the first decade, i.e. 7ohm is 3 x 2R and 1x 1R in series. That way you can buy cut tape in 10's and the cost is a lot better plus you get 1% resistors. Andy

@nickcaruso 11 ай бұрын

I built my own resistance substitution box... out of cussedness mainly. It... ... didn't look as good as this one. 😅 If it's really home made that's impressive!

@brainndamage 11 ай бұрын

If they made the outer rings separate you could take the switch apart wafer by wafer to get access to everything. I guess you could still do that by snipping the outer ring and making it into separate rings.

@lawrencelederer5060 11 ай бұрын

Definitely looks "homemade." Doubt it was something mass produced.

@herbertsusmann986 11 ай бұрын

I'd rebuild it with 1/4 watt 1% metal films and change the marking to 1/4 watt max

@ivolol 11 ай бұрын

Really nice layout with value * exponent, unfortunately probably needs a complete rebuild. Maybe you can find some hobbiest to gift to that would like to do that