On Nov 13, 11:33 pm, Jonathan Cline <jncl...@gmail.com> wrote:
> The circuit in the link above will perform OK since the
> rectifier is stated as "<0.2 amp". That is low to OK. Smaller power
> consumption for average electrophoresis boxes is in the range
> 40W - 60W as previously discussed on this group (do a search)
> and larger supplies seem to be about 200W (apparently overkill).
> The circuit yields full wave rectified output, not PWM output
Actually, since he's using a dimmer to regulate the voltage, you do
get a pulse-width modulation of the sinusoidal wave, which is then
full-wave rectified. Essentially, the dimmer chops out part of the
sinusoidal wave:
http://www.lutron.com/TechnicalDocumentLibrary/LutronDimmingBasics.pdf
You should be able to find dimmers, fuses, and rectifiers for up to
100W fairly easily, if 40W isn't enough. Of course, the output voltage
with this circuit will be limited by the line voltage, ~110V RMS in
the US.
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