[sdiy] Unmarked transformers

[The Old Crow]

  My transformer tester at my old workplace used inverse-parallel SCRs.  
MUCH better for reactive load driving.  My boss's used saturable-core 
reactors...  Triac control in many industrial situations is crappy in 
general.

  Industrial controls use a lot of oddly-familar circuitry; VCAs in firing 
packages, tri-square LFOs in quartz heater controls, pulse width controls 
in about every 1ph and 3ph firing circuit ever made...

Crow
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On Sun, 3 Oct 2004, harrybissell wrote:

> It sounds like you are describing a phase control (triac) light dimmer.
> These are OK for resistive loads like a (er...) light bulb but could be
> very dangerous on a transformer