[time-nuts] LPRO in TM500

[d.seiter at comcast.net]

Hi Corby, 

I had decided to put the LPRO in another box, but then other things came up, and now that I have time again, I'm thinking about returning to the TM module. I'm curious as to what voltage regulator you used? The input and output are so close that I'd thought only a dc-dc converter could do it. 

Happy holidays! 

Dave 
----- Original Message ----- 
From: "Corby Dawson" <cdelect at juno.com> 
To: time-nuts at febo.com 
Sent: Sunday, November 8, 2009 10:09:51 AM GMT -07:00 US/Canada Mountain 
Subject: [time-nuts] LPRO in TM500 

Dave, 

I have in the past installed a number of FRSC and also PRS10 into single 
slot TM500 modules. 

If I remember correctly I used a thick (about 1/8") aluminum plate most 
of the length of the module as the mounting and heat sink. 

The edge of the plate was attached to the module with screws and aluminum 
angle brackets to allow the top and bottom of the module to also help 
with the heat sinking. 

They all worked fine. 

If you use a dual wide module you will have more room to work with and 
maybe could used a finned heat sink. 

The edge connector used was one from a guy on ebay that made custom ones 
to use with TM500 Modules. 

You just screw it into place in the module using the existing holes. 

For power I paralleled the two 25VAC windings, fed them thru a full wave 
bridge into a largish capacitor, and then into a regulator set for 22VDC. 

The regulator is isolated with a silpad and bolted to the top frame of 
the module. 

The 10Mhz output is on the front along with a lock LED. 

Hope this helps. 

Corby Dawson 
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