Hello Kurt and all:
Worth looking at www.duncanamps.com
Go to section: PSU Designer.
Here you can model the performance of your power supply, or make decisions
about the components you will need.
The programme produces detailed time dependent waveforms of the voltage and
currents, including response to start up and load changes.
Allows you to set up the component values with mouse clicks. All standard
unregulated power supply configurations are preloaded in the programme.
I have found it accurate in practice.
Highly commended.
73
end
Barry Kirkwood PhD ZL1DD
Signal Hill Homestay
66 Cory Road
Palm Beach
Waiheke Island 1240
NEW ZEALAND
www.waiheke.co.nz/signal.htm
----- Original Message -----
From: Colin Lamb <k7fm@teleport.com>
To: kurt <uncrichie@home.com>; <amps@contesting.com>
Sent: Friday, 21 September, 2001 9:08 AM
Subject: Re: [AMPS] Voltage Doubler / Filter Capacitance Question
>
> Hi Kurt:
>
> There is a point of diminishing return for filter capacitance. The Orr
> chart is real simple to use.
>
> For serious use, transformers must be specially designed for voltage
doubler
> circuits. This means very low resistance. Otherwise, you will get a
> significant voltage sag when you "ooh" and "aah", which cannot be offset
by
> extra filter capacitance.
>
> Full wave rectification has less ripple than half wave rectification and I
> have seen no circuits for amplifiers using half wave rectification.
>
> Unless you have a hypersil transformer, weighing the transformer will give
> you a good idea of the capacity. Heavier is better. A good power supply
> will give you a hernia.
>
> On the other hand, Heath had a nice power supply in the SB-220 which was
not
> too heavy. It made up for weight by good design. When you use junk box
> parts, though, heavy is better. When I leave my house for a vacation, I
> have never worried about someone breaking in and stealing my amplifier
power
> supply. I have worried about whether or not I should reinforce the
columns
> for the second floor, though.
>
> 73, Colin K7FM
>
>
> --
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>
>
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