Electronics > Projects, Designs, and Technical Stuff

40V + 40V Mains transformer about 25–40 VA?Hi

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Chris56000:
Hi!

Can anyone recommend a mains transformer suitable for 115V or 230V supplies, with two 40V secondaries, each secondary current rating of 0.3A to 0.5A per winding, suitable for series or parallel connection of secondaries?

It's for use in a Curve Tracer Project!

Chris Williams

nali:
Sounds like the sort of thing you can salvage from an old consumer audio amplifier. I salvaged one recently from my old Technics SUV-650 which has 42+42+9.7V. It's quite a hefty lump of iron!

Chris56000:
Hi!

I'm looking for a quotable source of a new component, rather than a salvaged one, as I want to feature the Curve Tracer as a suggested project in my forthcoming Test & Measurement Theory & Servicing Book:–

https://www.vintage-radio.net/forum/showthread.php?t=166405

This three year project, to be completed by July 2023, will write up many years of my personal and other Members' experience in repairing T & M and accessible in one free place!

The book will be CC Licenced and a GitHub Repository will be opened once content is ready to be placed in it!

Chris Williams


nali:
Ah OK that makes a difference, I read it as a hobby project although I did wonder why you wanted 115/230v.

The only txformer people I've worked with is Vigortronix who are UK based, they've been pretty helpful fielding inquiries before, PM me if you want a contact.

Chris56000:
Hi!

The book will feature dual 115/230V operation in all the mains–operated circuits I propose to feature as buildable projects as that is the world standard for items of T & M – they're either universal operation, or have a readily accessible tapping switch – there's a very useful rotary "Bulgin" type that is fully touchpoof, mounts in a single round hole and consists of 2 ganged DPDT switches, compatible with tapped–primary transformers, dual primary transformers, or the 115/230V switched bridge–rectifier arrangements in mains–transformerless circuits!

The book will be written with UK terminology and symbols as it was the UK Vintage Radio Forum I am originally writing it for!

Chris Williams

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