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Avel Y236102 30VA 12V+12V Toroidal Transformer
How does one wire this transformer to 115 vac?
I would like to purchase the 30 watt Vellman amp and use this as the power supply but I have no experience using toroidals. What will I need and how do I wire it up?
See the Avel Torroidal Transformer Specifications sheet in Manuals/Resources next to the product description.Down at the bottom, it shows to tie the BLUE and VIOLET leads together to one side of the 120Volt line and the GREY and the BROWN leads together to the other side of the 120 Volt line. The secondary voltage is across the BLACK and RED leads and also between the ORANGE and YELLOW leads.If you put the two secondaries in parallel, you will have the same voltage as across one of the secondaries but with twice the current capacity. Tie the secondaries in series and you will get twice the secondary voltage across the composite secondary. Cheers.
Date published: 2012-03-24
Primary windings in series
Is there any reason not to connect the primaries in series to get 1/2 the output voltages?I need 12 VAC @ 1.8 A (total) for some speaker protection boards, which I would get with the secondaries in series; and 5 - 10 VDC for an LED, which I could get with one of the secondaries and a diode.
When running a transformer like this, you may have to derate the VA rating by as much as 50%. At full load in a normal configuration, there's 1.25A on each secondary winding and 0.125A on each primary winding. Drawing 1.8A at 12V the way you describe, you'd have 1.8A on each secondary winding and 0.18A on each primary winding. This will produce more heat due to resistive losses. Depending on the design of the transformer, it may run just fine or it may be damaged. The output voltage may also be a bit off in such a configuration since transformers are designed to compensate for losses.
Date published: 2012-10-16
Possible step-down and step-up combination?
would it be possible to use this one transformer to step-down 120VAC to 12VDC and also back up to 100 or so VAC? Was thinking of using this for a small tube amp or pre-amp.
You would not step down to 12 vac and then back up to 100 vac. It looks like this toroidal has multiple secondary taps, one may be 100 vac, call PE tech and inquire.
Date published: 2013-04-03