[Amps] Why a voltage doubler ?

[Carl]

Capacitance is cheap these days so doubling that covers the issue.

Carl


----- Original Message ----- 
From: "Paul Baldock" <paul at paulbaldock.com>
To: "amps" <amps at contesting.com>
Sent: Saturday, May 13, 2017 7:32 PM
Subject: Re: [Amps] Why a voltage doubler ?


> Doesn't a full wave bridge give you better regulation as all capacitors 
> are charged on both halves of the AC waveform, where as with a voltage 
> doubler the capacitors are only charged on half the waveform (half on the 
> positive and half on the negative)?
>
> - Paul
>
>
>
> At 03:55 PM 5/13/2017, Carl wrote:
>>The doubler had been used by hams since the 30's but made it into prime 
>>time with QST articles aimed at the Novice and other money challenged 
>>hams.
>>
>>National and Collins were early users and within a few years almost 
>>everyone was doing it.
>>
>>Ameritron still lives in the last century.
>>
>>Carl
>>
>>
>>----- Original Message ----- From: "Richard Solomon" <dickw1ksz at gmail.com>
>>To: "amps" <amps at contesting.com>
>>Sent: Saturday, May 13, 2017 5:09 PM
>>Subject: Re: [Amps] Why a voltage doubler ?
>>
>>
>>>Actually, the Yankee Skinflint in me likes
>>>to think it had more to do with economics.
>>>
>>>Copper wire and winding time is expensive.
>>>
>>>73, Dick, W1KSZ
>>>
>>>On Sat, May 13, 2017 at 2:00 PM, Ron Youvan <ka4inm at gmail.com> wrote:
>>>
>>>>     Paul Baldock wrote:
>>>>
>>>>Why did early amplifiers use voltage doublers rather than twice the
>>>>>secondary turns and a full wave bridge?
>>>>
>>>>   I think it is for two reasons, to control the impedance of the power
>>>>supply and to limit the fault current, if there is an arc.  (anywhere)
>>>>Then on rebuilds cheapskate HAMs double the value of the capacitors and
>>>>increase the fault current.
>>>>
>>>>   Making the plate supply overly robust (and low impedance) increases 
>>>> the
>>>>chances of a fault damaging things, if the supply caves in, hard damage 
>>>>is
>>>>minimized.
>>>>The SB-220 plate power supply was the perfect design for two 3-500s
>>>>throttled back to 1,000 input watts.  (then the limit)
>>>>--
>>>>   Ron  KA4INM - Youvan's corollary:
>>>>                 Every action results in unwanted side effects.
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>>
>>
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