>Did you calculate (yet) the regulation/ripple of using such a multipler
>using the array of 560 uF capacitors, assuming, say, a 500mA load current?
** I don't know how to go about calculating the ripple or how to size
the capacitors for a quadrupler ps. My estimate of 8 caps per quadrupler
assumed that some seriesing and paralleling will be needed. Any
suggestions from you would be appreciated on how to calculate the C
values for such a supply. Perhaps breadboarding such a supply would be
enlightening? Designing an amplifier for the supply will require
floating both the positive and negative hv circuitry from chassis ground
-- much as is the case with grounded-screen 8170/8171 and 8281 Class AB1
amplifiers. This will require a handfull of 3kV bypasas caps and a
filament transformer that can withstand 1500vdc.
cheers, Steve
>I haven't, but will. Now, I have to go look for the formula, which I
>haven't used in about 20 years! -Steve, WB2WIK/6
>> -----Original Message-----
>> From: Rich [SMTP:2@vc.net]
>> Sent: Tuesday, October 15, 2002 7:39 AM
>> To: Steve Katz
>> Subject: RE: [Amps] How light can you make a 500W amplifier?
>>
>> Panasonic/Matsushita aluminum electrolytic # P7420, 560uF, 400v is 35mm
>> dia by 50mm long. The current rating is 3A-rms. My guess on weight
>> is c. 60g each. A quadrupler would require c. 8 such capacitors. Two
>> quadruplers in series would require c. 16 such caps and produce c.
>> 2400vdc out @240vac in. The cost is c. $9 per cap for a total of c. $150
>> including rectifiers. Joe Jennings built a similar lightweight ps for a
>> portable linear amplifier some 40-years ago.
>>
>> >I don't believe a 1 kg power supply using a 6x multiplier at 50 Hz or 60
>> Hz
>> >is possible, at the current level required. Unless someone invents
>> nearly
>> >zero-mass large-value capacitors required by the multiplier, seems to me
>> a
>> >6x multiplier at any current level beyond a few mA is an inefficient
>> power
>> >conversion method at 60 Hz line frequencies.
>> >
>> >WB2WIK/6
>> >
>> >"If everything seems under control, you're just not going fast enough." -
>> >Mario Andretti
>> >
>> >> -----Original Message-----
>> >> From: Rich [SMTP:2@vc.net]
>> >> Sent: Tuesday, October 15, 2002 2:08 AM
>> >> To: Alan Ibbetson; AMPS
>> >> Subject: Re: [Amps] How light can you make a 500W amplifier?
>> >>
>> >> The lightest weight power supply would likely be a voltage-multiplier
>> >> type operating direct from the electric mains. With a x6 V multiplier
>> >> and 230V mains, c. 1600vdc could be produced for c, 1kg in ps weight.
>> >> With a 4cx800, 1600v would produce >500w. A foolproof screen supply
>> >> could be derived from the anode supply using a zener-string shunt
>> >> regulator. My guess is thar a total weight of 4kg should be do-able
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