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 Post subject: A Small Doodad Whatizzit
PostPosted: Sep Sun 15, 2019 3:14 pm 
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Location: Sunbury, Ohio 43074
Found this little home brew box in a pile of stuff. I understand the BNC to binding post adapter, and the hot to ground reversal switch. I don't understand the 330K resistor... anyone venture a guess as to what the builder intended here ??

I suppose maybe a high to low impedance converter (or the reverse) of sorts... but as crude as this implementation of such a device as this one is ... what was it supposed to be used for ?

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Sun 15, 2019 3:21 pm 
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It's the sort of thing you might use with a sensitive galvo or other detector to eliminate polarity errors, but there's never a way to short out the 330k for full sensitivity. Something audio for getting minimum hum, but again, the 330k seems high.


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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Sun 15, 2019 6:35 pm 
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With no context and no labels, it is an inscrutable mystery. What other sorts of things were associated with it in the group, if anything?

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Sun 15, 2019 6:42 pm 
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No telling if the binding posts were the output or the input, likewise the BNC. And the unused binding post was grounded.

It's also possible that the builder was trying out an idea that turned out not to work.


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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Sun 15, 2019 9:20 pm 
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Quote:
It's also possible that the builder was trying out an idea that turned out not to work.


I've got some of those too..... ;)

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Mon 16, 2019 11:15 am 
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[quote]What other sorts of things were associated with it in the group, if anything?/quote]

It was in an auction flat with "other things" :D I'm afraid it's true purpose shall be forever lost to history. I may just remove the resistor and use it as a BNC to banana converter. It's in a nice little shielded box about 1"x1/2"x1/2"

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Mon 16, 2019 2:54 pm 
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An input adapter, where the coax (signal) is in/out to an instrument/radio or RF source is parallel.

I made such a device for a Hammarlund SP-110x radio to "flip" the antenna which was coax to either side of the two terminal antenna input for the radio. The antenna was only partially resonant so the shield of the coax was ,on certain bands, picking up signal. I would not know the signal was there unless I flipped the switch. My circuit was deLux :D I also included a ground selector switch. Crazy? No, it worked and it is still attached to the radio via the terminal screws, I don't like permanent mods to a boatanchor. It was my first experiment with printed circuit. I had a pal that worked at the local printed circuit factory, I got scrap board and some etchant. Mil spec fiber glass, tough as nails board too...

Chas

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Mon 16, 2019 3:05 pm 
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We locally manufactured some stuff like that at work. Without any labels or context they would be a total mystery to anyone and so specialized that even if you knew you could not use it for much else. They are for parts, or what you can make of them.

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Mon 16, 2019 3:13 pm 
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It appears to be an early component from a Turbo Encabulator

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Mon 16, 2019 5:41 pm 
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My best guess about the resistor... It prevents a short in case the switch makes contact between 1 and 2 when switching position.
I would check for a short between 1 and 2 when switching before removing the resistor.
Why 330k? No idea.

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Mon 16, 2019 10:26 pm 
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flyboy71 wrote:
It appears to be an early component from a Turbo Encabulator


That's a relief. I was thinking it might have been a DiLithium Crystal Degenerator .........

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Mon 23, 2019 1:11 pm 
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flyboy71 wrote:
It appears to be an early component from a Turbo Encabulator


Personally I think that it's the input network for a Heisenberg compensater.

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 Post subject: Re: A Small Doodad Whatizzit
PostPosted: Sep Wed 25, 2019 9:47 am 
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For testing a stereo amp. Feed signal to left input with right channel input grounded.

Then the other way.

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