Products > Test Equipment
Bronson ++ Isolation transformers-Any good?
TheBay:
--- Quote from: djsb on November 14, 2021, 03:30:05 pm ---The ASIN of the one I bought is: B07JMCT1BZ
Bronson++ MII 3000 Isolation Transformer Toroidal Core 3000 Watt - In: 110V / 230V - Out: 230
Also, maybe a slide switch like this could be inserted into the front or rear panel to connect/disconnect the earth to the sockets
https://uk.farnell.com/multicomp/mcsl15-121alcj-p3a-1jcn/slide-switch-spdt-12a-250v-panel/dp/2454615
--- End quote ---
Ah you went for the multivoltage input model, confusing why this one is cheaper than the 1:1 version.
As there is more going on inside this and must cost more to manufacture, the PCB must detect the incoming voltage and switch over the primary transformer taps as I can't see a separate 230/110v input.
djsb:
The transformer SEEMS (I can NOT prove this) to be contract manufactured by Huizhou Yinghua Electronic Company Ltd in China.
The transformer itself is marked GDYHDZ as are the relays on the PCB. There is also a Holtek HT46R064B OTP microcontroller on the PCB. Here are some photo's.
TheBay:
Thanks for the teardown :-+
Looking at the products from Huizhou Yinghua Electronic Company Ltd they have a very similar build and PCB's so I wouldn't be at all surprised if they built the whole unit.
I've got to laugh how they have doubled up the current capability of that switch, they should have used a higher rated switch and insulated the terminals. I'd dread to think what would happen if that switch popped out or fell apart, even mechanical stress or vibration could cause those soldered wires to fall off. They should have switched both L/N really as well.
The lid should have an earth cable going to the chassis or the earth point with some toothed star washers, but that can be added easily.
It all could do with a check over and tweak some things to make it safer.
Not sure what to say about the lack of earth to the sockets, I feel it should be there and down to the user to disable if they absolutely must.
djsb:
So, are you going to buy one as well? Or are the issues you mention putting you off?
TheBay:
--- Quote from: djsb on November 19, 2021, 05:12:27 pm ---So, are you going to buy one as well? Or are the issues you mention putting you off?
--- End quote ---
I rang Screwfix today as I've been trying to buy their 3000VA (1500VA Continuous) Isolation transformer and it is never in stock for Click and Collect or Delivery, they informed me that it's on back order and delayed from their supplier. I may hang on a little bit and see if they come back in to stock.
But if they don't I'm sorely tempted by the Bronson++ unit, check its all wired correctly and safe then do a couple of modifications.
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