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@gmail.com>
To: "amps" <amps@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@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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