Also I checked the coil like Mr Jaun said and it seems to match a data sheet I found



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What's weird about the data sheet is I downloaded two pages and I can access and read them etc plain as day but if I try to upload them here they get dim and won't let me do it 

Yes sir thanks definitely better doing it that way if I connect it at voltage I get a click

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If I adjust the power supply "com" and "NC" open at about 16v DC then I have to roll it back to about 6v DC before it closes back up

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Also if I hold the relay while doing that if I don't hear it I can feel it

Well I tested one of these new relays with a power supply and some leads and a multimeter monitoring continuity.

They seemed to open and close fair enough but I'll be damned if I heard a single click 

Idk maybe it's not supposed to make an audible click

But...I think that's what I am hearing click in the power supply as voltage is increased.

Comparing the markings on the devices I definitely see a difference but idk if that means anything.

Oh well it's not like I spent a fortune 🔮 on these. 

 

Yes sir thanks 

Now I need to devise a plan to test the ones in circuit

Ok looks like this is what the deal is

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A new ridiculously heavy toy here

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Btw I'm aware that a lot of caution still needs to be exercised here.  It's now like "oh look an isolation transformer I can do any stupid thing I want and it will be ok" 

I'm guessing that if one were to grab each end of the secondary it would not end well.   

Also there is a third prong that looks to be continuous 

Honestly this will be probably gathering dust for a while.

As a rule ATM pretty much what I do think and have learned is at least have some type of transformer like a step down between me and mains 

If you remember my Voltron Wattmeter I guess it was nothing more than a transformer with a meter.

Btw more caution while looking at various devices on eBay it seems there are autotransformers that aren't round and look like "normal" rectangular transformers.

 

But anyway wow I love how this has some nice cords on each end so I don't have complete chaos with a thousand wires going everywhere 

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It's time for me to learn how these work and be able to test

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Another reason I got them is because I suspect (probably erroneously  ) one side of my 30 volt  dual power supply is only going up to about 13 volts 

I hope these are the same here is one from my power supply

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Wondering now if they are real...idk 

Or better yet

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(Duh  )

 

Ok nevermind I think it is parallel if we consider the emitter to be the node... possibly

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So the voltage drops across the resistor and bipolar junction on each side have to equal each other 🙏

Something else that was bugging me 

So I drew a picture to describe

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Yeah I know...go look it up 

I was also glad to see (because I wondered about it) is that regardless of a transistor in the loop Kirchhoff's law still applies 

For instance start at Vcc go through collector resistor then through transistor then through emitter resistor or whatever all the way to ground the voltage drops have to add up and the same for starting at the voltage headed to the base 

This is a great book 📖

I just made a pretty big step forward trying to comprehend all this stuff when this book pointed out that the collector-base junction of a transistor is in zener mode when conducting

Idk why I couldn't get past thinking it had to be forward biased ie pointing the same way as the base-emitter junction

So then I was thinking ok well all we have to do is increase collector voltage to get it to work but then I was like aahh ok yeah that's where the role of the base come in.   


As a technical aside he points out that many a transitor has been installed incorrectly and it might "work" to some degree but problems will remain 

Idk sir

Can only speculate many moons ago a student or hobbyist built a peligroso DC power supply?

CUIDADO !


 

YOU are THE macho man amigo 

Gracias 

If you are interested in the device here is the front panel
Oh yeah the knob for that rheostat is just to the left of the "79" and the bottom middle is a big green lense with a bulb 💡 inside

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The lid pops up as well as the chassis slides out

There was no transformer  just mains to selenium rectifiers 

Then there were a couple humongous capacitaters and a one thousand pound choke

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Thank you for the responses that was very educational (and entertaining) 

That varnish seems to be good stuff as far as insulating properties 

Unfortunately it is greatly hindering my meager feeble attempts at seeing if these selenium rectifiers are working because idk if they are not working or I'm just not not getting conductivity 

Also there is a curious looking potentiometer/rheostat device.  It almost looks like it has windings like a variac autotransformer but its diameter is only about the size of a silver 🪙 dollar 

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It was on the front panel of the box with the knob missing I guess to control voltage