[time-nuts] LPRO in TM500

Bob Camp lists at cq.nu
Thu Dec 24 14:30:26 UTC 2009


Hi

Traditional Efratom circuits would run down to 19 volts without real complaint. In fact the power dissipation was less at the lower voltage.I don't know how much of that they carried on into the smaller versions.

Bob


On Dec 24, 2009, at 2:20 AM, d.seiter at comcast.net wrote:

> 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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