Nice tutorial, Dave. Just what I would think, but it is clear that this
power supply is VERY susceptible to whatever the pan is doing. One more
suggestion.

Run the fry-pan on high, but use a real Variac to reduce the power... Not so
$$$ a solution.

73, Steve, K9DCI

snippers on high...

"Dave Platt" wrote in message
...
My ham radio 110-13.8 V power supply interacts with my electric
frying pan. No matter how far away in the house I plug them in, there
is a harmonic that causes the power supply to make a loud hum.
... it
only happens when the pan is switched to "low", not on "high".

What these symptoms suggest to me is that the "low" setting of the pan
is probably switching in either a half-wave rectifier diode, or some
sort of triac-based switcher... the former seems more likely. [snip]

Triac-based switchers, ...can cause transformer buzzing and the "singing"
of
light bulb filaments.

Not to mention RF noise @ HF.


...solutions...:

- Replace the electric fry-pan ...

- ...isolation transformer ...

- Try a ferroresonant ...

- ...different type of power supply.

- Unplug your ham supply...when the fry-pan is in use...

- To mis-quote the old saying, "Be cooking with gas!"