Whats this gizmo.

dr pepper

Well-Known Member

Most Helpful Member

• Nov 24, 2013

• #1

This is my lab doorstop.

Any ideas what it is and off?

Theres 4 copper strip terminals I put 12vdc across 2 of them and it pulled my supply down to 0.3v so I'm thinking very old selenium rectifier, maybe a valve transmitter?

 

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alec_t

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• Nov 24, 2013

• #2

Can we see a pic?

 

dr pepper

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• Nov 24, 2013

• #3

Pic now up.

 

ronsimpson

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• Nov 24, 2013

• #4

Paper weight.

Can we see more detail. Does the top come off?

 

dr pepper

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• Nov 24, 2013

• #5

It makes a decent doorstop.
Theres 2 10mm cap heads holding what appears to be the diodes on, they are tight if I try to wrive them no doubt the ceramic insulators will drop to bits.

 

alec_t

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• Nov 24, 2013

• #6

Do they measure as diodes?

 

ronsimpson

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• Nov 24, 2013

• #7

They look like diodes for a DC electric welder.

 

dr pepper

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Most Helpful Member

• Nov 24, 2013

• #8

My meter doesnt read any forward voltage drop.
The 0.3v drop I got earlier was because I was connecting across the common bus between them.
The devices themselves with 30v across them from my supply do not pull any current, I'll test them with my component tester when I get home.
All making me think they are h.t.(diode stacks with several volts vf), there was a short bit of wire on them, it was only 16/0.2 so could only carry a few A, the insulation didnt look anything special though.