House wiring? (slightly off-topic)

[harry]

Hi Dave:   (welcome!)

<snip>

Dave Krooshof wrote:

> I think the whole misassumption lays in:
> >it must *draw* more current (generate more heat) at a lower voltage.
> Nothing *draws* current, nor power, nor amperes.
> All lamps and synths *get pushed*.
> The question is how much they resist the pushing.

<unsnip>

True for the case of a resistive load... only!

A dangerous point here, from a DIY perspective. Some things do INDEED
draw current, as opposed to being "pushed".  Most Diode junctions, LED's
Neon lamps, Fluorescent lamps... draw all the current they can get, to the point
of self destruction.  It is necessary to prevent them from drawing too much
current
by having a limiting impedance (or resistance) in series with them.

Now you might think that that was because the voltage rating of the junction is
(lets say) 0.7V and you are pushing it with more... but its better to think that
it
is sucking the current, not being pushed. This is especially true for bipolar
transistor
junctions, which have a lower voltage drop as they get hotter... so as they suck
more
current, they heat and suck even MORE current.... (till death!)

> --ok, back to synths--
> I've made a dedicated bass synth 'tuba', see http://www.xs4all.nl/~krooshof
> The only problem is, since I built it out of several DIY and prefab units,
> that I need a lot of different voltages to go into the box. And man, it's
> become a heavy thing to carry around.
> So does anyone here have a schemetic to build a powersupply that'll give me
> 9, 12, 18, and 24 volts? I might need to do the 12 volts apart form the
> rest anyway, as that circuitry contains over a dozen relais that will spike
> about while in operation, unless it's neatly cancelled out.

Er... at 9, 12, 18, and 24 volts... how much current will the circuits SUCK ???

H^) harry

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