[ARC5] Vibrator Power Supplies

[Bob kb8tq]

Hi

It’s certainly easier to do with modern FET’s and modern analytic techniques than it
was back in the days of germanium devices with Ft’s measured in KHz  and questionable
specs on a variety of parameters …. Early (50’s and 60’s) solid state ignition designs suffered 
from a lot of the same sort of issues. 

Bob

> On Nov 21, 2017, at 1:56 PM, Peter Gottlieb <kb2vtl at gmail.com> wrote:
> 
> It is possible to design a nearly bulletproof switcher using fets, but the designer has to know what they’re doing. 
> 
> 
> Peter
> 
>> On Nov 21, 2017, at 1:38 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
>> 
>> Hi
>> 
>> Well, I can tell you that the normal vibrator supply typically had better reliability 
>> in the field than the early germanium based “transistor” supplies.
>> 
>> Bob
>> 
>>> On Nov 21, 2017, at 12:06 PM, Dave Jackson <cjack93907 at razzolink.com> wrote:
>>> 
>>> Thanks Bob. I've been curious as to how the vibrator design compares with
>>> the solid state MOSFET SMPS design as far as the contact life vs. sparking
>>> (with the corresponding contact erosion).  This will help answer my
>>> questions.
>>> 
>>> Sincerely,
>>> 
>>> Dave WA4OBJ
>>> 
>>> -----Original Message-----
>>> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
>>> Behalf Of Robert Nickels
>>> Sent: Tuesday, November 21, 2017 8:00 AM
>>> To: arc5 at mailman.qth.net
>>> Subject: Re: [ARC5] Vibrator Power Supplies
>>> 
>>> A lot of effort - both science and engineering - went into the design of the
>>> low-cost DC-DC converter of the early 20th century, aka the vibrator power
>>> supply.   As the leading manufacturer of vibrators,  P.R. Mallory Co. put
>>> out a comprehensive design manual in 1947 that may be of interest to anyone
>>> seeking to understand the design of such power
>>> supplies: www.tubebooks.org/Books/mallory_vibe.pdf
>>> 
>>> 73, Bob W9RAN
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