[ARC5] Dynamotor Voltage Reduction

[Mike Feher]

I still have a bunch of the 14 volt ones NOS. Time to put them on eBay. 73 -
Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of David Stinson
Sent: Sunday, November 5, 2017 2:16 PM
To: ARC-5 <arc5 at mailman.qth.net>; milsurplus at mailman.qth.net
Subject: [ARC5] Dynamotor Voltage Reduction

 

Fair Radio sold a ton of these dynamotors.

 

 <https://photos.app.goo.gl/VK5Tvb74vaOGUiR12>
https://photos.app.goo.gl/VK5Tvb74vaOGUiR12

 

Sold in both 27 and 14 Volt versions, they were  originally designed for a
Magnavox interphone amp that serviced the TCS.  They fit on the back of
Command Set receivers, but they output 285VDC; much too "hot" for this
purpose

 

 <https://photos.app.goo.gl/vI5KZ3y961HsTbnr1>
https://photos.app.goo.gl/vI5KZ3y961HsTbnr1

 

A simple way "calm it down" is to open the base and insert a 5-watt Zener in
the B+ lead, cathode toward the dyno and anode to the output.

Cover it will heat-shrink tubing.  

A 1N5371 will take 285V down to 220V.

A 1N5378 will drop it 100V, but that might be pushing the dissipation of the
diode.  

You can select a drop with any of the 1N53** series.

 

 <https://photos.app.goo.gl/FaydfesDmarD5fQB2>
https://photos.app.goo.gl/FaydfesDmarD5fQB2

 

I've run it this way for hours.  No problems.

 

73 OM DE Dave AB5S

 

 

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