[sdiy] Toroidal Transformer considerations

[John L Marshall]

You will experience a problem only if the mounting method makes a complete
turn. When I was a young pup I made a voltage inverter using a toroidal
transformer. I bolted the transformer to the side wall of the aluminum box.
I used an aluminum bracket and three bolts, one through the center and two
through the ends. When I powered up for the first time the oscillator was
working perfectly but after a short while the center bolt started to turn
color as heated up. The power of stupidity and a lot of current. The problem
was fixed by insulating the bolt in one place. Any conductors, magnetic or
electric are not much influence even when directly adjacent.


----- Original Message -----
From: Keith Winstanley <keithw at cix.compulink.co.uk>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, October 18, 2001 5:45 AM
Subject: [sdiy] Toroidal Transformer considerations


> I am putting together a couple of +-15V PSU for my
> modular, the digisound design and I am using 20VA
> toroidal transformers. Now I am sure there are some
> considerations when mounting these transformers?
> My cabinet is wood and I am thinking of mounting
> the PSUs inside an aluminium chasis. Are there
> problems using ferrous bolts through the toroid?
> The hold in the middle is threaded and I am sure that using
> a brass threaded bold will be fine but could someone give
> me a quick safety lecture? Induction etc??
>
> TIA
>
> Cheers...
>
> Keith
>
> http://home.freeuk.net/lowpass
>