[ARC5] Vibrator Power Supplies

[Dave Jackson]

Bob:

Agreed! I  used to work on 1960-70 era Motorola Motracs and they would regularly blow the Germanium transistors for no apparent (at that time) reason.

Sincerely,

Dave WA4OBJ

-----Original Message-----
From: Bob kb8tq [mailto:kb8tq at n1k.org] 
Sent: Tuesday, November 21, 2017 10:39 AM
To: Dave Jackson
Cc: W9RAN at oneradio.net; arc5 at mailman.qth.net
Subject: Re: [ARC5] Vibrator Power Supplies

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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