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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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