[ARC5] Vibrator Power Supplies

Tue Nov 21 14:50:51 EST 2017

 Plus dynamotor and inverter brushes create sparks, and many of the larger ones are not sealed but pump air through.

There is a practical limit of around 3 or 4 amperes for each contact, which limits the power per contact set and led to designs with two vibrators and two rectifiers in parallel (PE-125-AX) or several contact sets in one vibrator (PE-237).  But the basic design of the electro-mechanical vibrator is sensitive to G-loadings in several directions which would make them undesirable at any power level in fighter and maybe dive bomber aircraft.

Cc								

ARC-5 Mail List arc5 at mailman.qth.net, D C _Mac_ Macdonald k2gkk at hotmail.com, Robert Eleazer releazer at earthlink.net

None of the switches or relays were explosion proof so I don’t think that was a real design concern. 

Peter

On Nov 21, 2017, at 2:14 PM, kg4kgl at gmail.com wrote:

Col. Paul Tibbets in his (auto)biography said he smoked cigarettes while flying. He must have not been too worried about any gas fumes. 

Robert
KG4KGL 

On Nov 20, 2017, at 21:11, D C _Mac_ Macdonald <k2gkk at hotmail.com> wrote:

It just might have something to do with keeping devices that create sparks on make and break away from an environment with high octane gasoline fumes possible.

73 de Mac, K2GKK/5 

-----Original Message-----
From: Peter Gottlieb <kb2vtl at gmail.com>
To: kg4kgl <kg4kgl at gmail.com>
Cc: ARC-5 Mail List <arc5 at mailman.qth.net>; D C _Mac_ Macdonald <k2gkk at hotmail.com>; Robert Eleazer <releazer at earthlink.net>
Sent: Tue, Nov 21, 2017 1:25 pm
Subject: Re: [ARC5] Vibrator Power Supplies

None of the switches or relays were explosion proof so I don’t think that was a real design concern. 

Peter

On Nov 21, 2017, at 2:14 PM, kg4kgl at gmail.com wrote:

Col. Paul Tibbets in his (auto)biography said he smoked cigarettes while flying. He must have not been too worried about any gas fumes. 

Robert
KG4KGL 

On Nov 20, 2017, at 21:11, D C _Mac_ Macdonald <k2gkk at hotmail.com> wrote:

It just might have something to do with keeping devices that create sparks on make and break away from an environment with high octane gasoline fumes possible.

73 de Mac, K2GKK/5 
(Since 30 Nov '53) 
Oklahoma City, OK 
USAF Retired 61-81 
FAA Retired 94-10 

From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> on behalf of J Mcvey via ARC5 <arc5 at mailman.qth.net>
Sent: Monday, November 20, 2017 19:32
To: Robert Eleazer; arc5 at mailman.qth.net
Subject: Re: [ARC5] Vibrator Power Supplies

They did use vibrators in a lot of WWII equipment. BC659/620 series and and BC1306 were just a few examples of that.
Why they didn't use them in aviation may have something to with the altitude and temperatures they may be exposed to?

On Monday, November 20, 2017 8:12 PM, Robert Eleazer <releazer at earthlink.net> wrote:

The 800 HZ discussions have led me to once more wonder about vibrator power supplies.  I have 1945 vintage Aviation magazines that have full page ads for this wonderful new invention (the same mags advertise something new called the Phillips Screw).  And I have an old Heathkit VP-1 vibrator power supply that produces 60 ma at 250V with a 12VDC input.  Let's see, now, do we know of any WWII aircraft electronics that require that kind of power?

As far as higher power outputs I have the transformers from an RCA UHF Carfone I bought for $1.00 that are for a vibrator power supply.  I don't know how much power that can handle but it is probably far more than an SCR-522 or ARC-3 would require.  That set had 6146B's, I think

So do we know why vibrator power supplies did not come out in the late 1930's and get used in WWII?

Thanks,

Wayne
WB5WSV         

Virus-free. www.avg.com 

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