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 Post subject: Someone might be interested
PostPosted: Mar Wed 20, 2019 4:51 am 
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Location: Kingsville, OH 44048
Didn't know if some of you old circuit masters might be interested in this thingy!!
https://pittsburgh.craigslist.org/atq/d ... 55318.html


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 Post subject: Re: Someone might be interested
PostPosted: Mar Wed 20, 2019 12:45 pm 
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That looks like a fun little piece. I bet they would ship it too...
No kirk... No...

lol

:)

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 Post subject: Re: Someone might be interested
PostPosted: Mar Wed 20, 2019 2:54 pm 
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That's an odd bit of kit.

Having trouble working the combinatorics in my head...

Single caps
.5
.2
.05
Pairwise:
.5 + .2 = 1/7 = .14
.2 + .2 = 1/10 = .1
.5 + .05 = 1/22 = .045
.2 + .05 = 1/25 = .04
.05 + .05 = 1/40 = .025
Threes:
.5 + .2 + .2 = 1/12 = .083
.5 + .2 + .05 = 1/27 = .037
.2 + .2 + .05 = 1/30 = .033
.5 + .05 + .05 = 1/42 = .024
.2 + .05 +.05 = 1/45 = .022
Fours:
.5 + .2 + .2 + .05 = 1/32 = .031
.5 + .2 + .05 + .05 = 1/47 = .021
.2 + .2 + .05 + .05 = 1/50 = .02
All five:
.5 + .2 + .2 + .05 +.05 = 1/52 = .019


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 Post subject: Re: Someone might be interested
PostPosted: Mar Wed 20, 2019 6:42 pm 
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Location: Redding, CA
It is not possible to have all capacitors in series on this unit. At best, you can have two combinations in series. And, a lot of combinations that can produce. Enjoy the recalculation!

Norman

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 Post subject: Re: Someone might be interested
PostPosted: Mar Wed 20, 2019 8:23 pm 
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Are you saying, based on the type of knife switch used, an individual switch cannot be in the open position? If that's true, then you're probably right. I don't recognize the actual make/model of the switches.

I was assuming a switch could be connected to the top bus, open (sticking straight up in the air, not seated in either contact) or connected to the bottom bus. I think, using 3-state switches, all the combinations I listed are possible.

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 Post subject: Re: Someone might be interested
PostPosted: Mar Wed 20, 2019 9:54 pm 
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Location: Redding, CA
Okay, I can see how they can be placed in series. After more examination, they cannot be placed in parallel. Weird.

Norman

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 Post subject: Re: Someone might be interested
PostPosted: Mar Wed 20, 2019 11:28 pm 
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Braithwaite wrote:
Okay, I can see how they can be placed in series. After more examination, they cannot be placed in parallel. Weird.

Norman


I think they can be put in parallel, too - all by positioning the switches in alternate directions, or in pairs by setting the switch at each end of the desired caps to the opposite busses.

-Pat

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 Post subject: Re: Someone might be interested
PostPosted: Mar Thu 21, 2019 2:17 am 
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Great. But not fifty bucks great. And they mention the S word. Steampunk.

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 Post subject: Re: Someone might be interested
PostPosted: Mar Thu 21, 2019 3:15 am 
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Actually, I'm more of a mind with Norman, that they can't be placed in parallel.

I guess it depends how the buses are wired, which is impossible to tell without seeing the back of the panel. If they can be placed in parallel, it knocks out a few of the series combinations, I think.


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 Post subject: Re: Someone might be interested
PostPosted: Mar Thu 21, 2019 7:03 am 
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palegreenthumb wrote:
Actually, I'm more of a mind with Norman, that they can't be placed in parallel.

I guess it depends how the buses are wired, which is impossible to tell without seeing the back of the panel. If they can be placed in parallel, it knocks out a few of the series combinations, I think.


Why not? It makes sense that the buses run down on either side to the contacts on their respective sides, as depicted by the white lines on the front panel. Assuming that the switch levers may be positioned to connect to the left bus, vertically in the center making no other contact, or to the right bus, then you may set them up to give any single cap, any two, three or four adjacent caps, or all five caps in series.

Series combinations (and the bottom left sketch in the image below should have been marked 4 & 5, not 5 & 6):
Image

Image

Similarly, in parallel combinations you can get any pair, any three, any four or all five.

Some of the parallel combinations:
Image

Image
(I lack the ambition at 2 AM to draw out all the possible parallel permutations)

And finally, all in parallel and all in series:
Image

I think it's actually a pretty clever design, now that I've more or less wrapped my head around it.

-Pat

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 Post subject: Re: Someone might be interested
PostPosted: Mar Thu 21, 2019 11:28 pm 
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Yeah, you're right Pat, that would make the most sense. And like you said, this limits series caps to be adjacent.

My original post included some series combinations that were not adjacent, like .5+.2+.05, which would not be possible with this setup.

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