I bought a couple of these small transformers, RS part number
310-1178 (www.block-trafo.de, part VB 0,35/2/6), to use in
an AC voltage monitoring circuit

The circuit has a full bridge and 12k load, buffered by an op-amp,
which should give a measurable range for the PIC's A2D. I got a
little concerned that the transformer heated up quite quickly, so
took some measurements

 http://home.clear.net.nz/pages/joecolquitt/block-tx.html

(My 3 meters don't seem to handle non-sinusoidal very well)

At first I thought it may have been a mis-labelled 120V primary
because of the high secondary outputs (nominally 0-6 0-6 on the
case)

I noticed that the tx runs significantly cooler with a greater load
than either open circuit or 12k

Is this to be expected ? A 1k load is no problem for the circuit,
but I didn't want the transformer to just burn out after a few days

TIA

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