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My best scrap yard/dumpster finds.

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TerraHertz:
Your first drawing is more correct, but you left out the caps (on the green winding.)
This is a basic constant voltage output transformer. A kind of regulator that uses only magnetics.
Don't feel bad about not understanding it, at the moment I don't really either. I think I did in the past, but have forgotten the details. Hopefully someone here can give a comprehensible explanation. (And this time maybe I'll remember it.)

I know the output waveforms are non-sine due to saturation of parts of the iron core - which is deliberate and an element of the voltage regulation process.

bktemp:
A constant voltage transformer explains the unusual names on the output connections. In addition to changing the capacitor connection you also need to adjust the output winding when switching frequency (connection 9+10).

Wkipedia has some information about constant voltage transformers:
https://en.wikipedia.org/wiki/Voltage_regulator#Constant-voltage_transformer

It basically acts as a limiter by saturating the core, followed by an LC resonant circuit to recreate the sinewave.

Bendba:

--- Quote from: TerraHertz on June 12, 2017, 10:02:51 pm ---Don't feel bad about not understanding it, at the moment I don't really either. I think I did in the past, but have forgotten the details. Hopefully someone here can give a comprehensible explanation. (And this time maybe I'll remember it.)

--- End quote ---

That's reassuring. I get the idea but the needy-greedy details are a bit muddy. But I'll get there.

______________________________________________

It's party time!!!

Bulky household waste collection week in my council. Well, next week but people already put stuff outside.

I went for a half hour drive and picked up 4 CRT tv's, one with built in VCR, 3 microwaves, an 32" lcd tv, and a couple of radios and printers.

I'll be doing some scraping this weekend and I can put the gutted carcasses outside before they do the pickup.

I just wish people would throw out oscilloscopes and other tools.

Bendba:
Just gotta love people throwing out perfectly working stuff.
Today on the side of the road, a 27" Sony CRT (4 composite inputs, one component input and antenna input).
I needed a good screen for my Commodore 64 anyway  :-+
Got it home, plugged it in and that's it. (Could do with some fine tuning)


Bendba:
Hi there,

The council pickup is all over. There is the tally. Most of it has already been scraped and taken apart to save space.

7 CRT tv's, one has a built in VHS recorder in it (keeping that one, as well as the 27" Sony)
1 CRT computer monitor (VGA)
8 microwave ovens
4 large LCD tv's, one was a LED back lit (that'll give me some bench lighting for the day I build a lab)
3 VHS
2 DVD players
1 steam clothes iron (I'm thinking about modifying the boiler's fittings for a model steam engine)
2 cordless drills and chargers
1 bashed up UPS full of nippon chemi-con caps (hence the photo)
5 car lead acid batteries to trade at the scrap metal yards
2 cheap "hi-fi" radio-cd-cassette players
5 inkjet printer

So I'm all stocked up in transformers, caps, switches, connectors, leads, motors, opto's, screws, power transistors ,... I kept one of the tv's SMPS (+-5, +-12, +24, +32V output.) Stocked up on VFD's too.
And I got a big bin of boards to salvage parts out of.

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