TA-0385: Dactron Auto STAC ST1000W AC Volt Regulator - 1KVA - 1990 - Teardown
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- čas přidán 23. 08. 2024
- Servo Controlled, must be more than just a transformer. Teardown
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#STAC #DACTRON #ST1000W
This is the nicest video about variacs I have ever seen.
Thank you!
Very cool, Tony. You see something new every day - even if it is old tech! It is in amazing condition for its age. Thank you for showing it to us. Regards, David
Thanks David.. some smart engineers
This regulator is impressive... Thanks Tony for the video demonstration...👍
Thanks Grer!
Hi Tony, What a great system and very useful. In these days of electronic power regulation it is so nice to see an alternative way to regulate AC voltage. Sometimes the simpler ways are better and this is clearly the case here. A nice video Tony with some excellent close ups and a very detailed explanation of how to use it and how it works. Ian
Thank Ian, yes amazing what they are able to do with so little components.
That's a great item, I have never seen a variac with a servo control before, great design. I would love it if there was a dial or indicator on the front to show the movement!
Yes more LEDs , but i keep it original..
That is WAY COOL! You should put a transparent top on it and vented sides to let the sound out!
Oh Yeah that would be cool!
Hi Tony, variac with comparator voltmeter, beautiful thing, I wanted to buy it on e-bay once, but someone blew it on me 😁 My plan was to modify it for external control and after switching from automatic, I planned to control it from my test panel with a potentiometer. In the end, I gave up on it and kept the big transformer next to the table, and instead of the potentiometer and servo under the table, I twist the variac manually, its place under the table was taken by the second isolating transformer, and there is only a switch on the panel (the one next to the network analyzer with the yellow LED).
Nice day 🙂 Tom
Yes great to have something like that under the desk..great solution Tom!
Hey Tony! Prachtig instrument en dat voor een habbekrats! Dat was een heel gelukkige koop en dat je dan ook nog de 1000kVA variant voor hebt zeg. Ik krijg steeds meer bewondering voor die speurneus van jou 😊
Was erg leuk om te kijken hoe het nou werkte.
In industrial settings here in the US, Auto-Transformers are used a lot. They maintain 120volts out with varying AC input and do not use any moving parts. I don't know how those work.
I think you are referring to Ferroresonant Transformers. They use a capacitor and an additional winding to form a resonant circuit at the mains frequency combined with a special core. Lots of articles online explaining how they function. Regards, David
@@davidv1289 Yes, now, I imagine they can not handle a lot mains swing. I was in a factory once, the CRT filaments of an instrument were running bright and the trace would uncontrollably bright. Brought the instrument back to the lab and it worked perfects for hours. Took it back to the line and immediately out of control brightness. My fluke DVM showed 120vac mains. An electrician brought his line analyzer and could see 600volt harmonics on the mains!! They got one of those regulation transformers out of stores and it fixed the problem and have been using them on all of their UT equipment since. I bought a line analyzer after that (~$2600 in the early 1990s if I recollect correctly), but never ran across that situation again.
Thanks you guys very interesting discussion... nice to know how this type of technology of line regulation is used in practice.
You have too much stuff. LOL. Stay well my friend. Regards Chris
There is never enough measuring technology, and moreover, it does not have much, a weak average 😂
Thanks Chris... let's just say a lot :) All my best to you and yours my Friend!
Very impressive...wondering how I can get one....
Thanks, i found on ebay
👍
Thank you!