[TenTec] Crowbar kit for 252/262 power supply

[A R]

Thanks, Al. Yeah, it's a pretty simple circuit. I recalled discussion some months ago regarding the kit that TT offered as being compact and easily fit into the 252. So thought it at least worth trying. I guess I'm surprised that TT didn't design in o/v protection as well as o/c protection. The 225 supply for my recently acquired Argosy has both. Wasn't the Argosy a contemporary cousin of the Triton?

 

73,

Allen


----- Original Message ----- 

From: Al Gulseth<mailto:wb5jnc at centurytel.net> 

To: tentec at contesting.com<mailto:tentec at contesting.com> 

Cc: A R<mailto:raf_3 at msn.com> 

Sent: Sunday, August 02, 2015 4:35 PM

Subject: Re: [TenTec] Crowbar kit for 252/262 power supply



Allen,

The OVP is not "rocket science" so to speak - it's just a zener diode, a 
heavy-duty SCR of the proper rating, a fuse, and a few passive components. It 
should be fairly easy to build one on a breadboard or in a small external 
enclosure along the lines of the 1150 (if I remember the model # correctly.) 
There may be a scan of the crowbar manual/schematic floating around 
somewhere, or otherwise you could clone the crowbar circuit from the Astron 
RS-20 series. (It's a variant of the circuit TT used.)

73, Al

On Sun August 2 2015 6:09:25 pm A R wrote:
>    Does anyone have a TT overvoltage crowbar kit for a 252/262 PS that they
> never got around to installing? Haven't checked for availability from TT,
> but have to believe they're LONG ago obsoleted and not available. If you've
> got one, please reply off list.
>
>
>
> TNX es 73,
>
> Allen--W7GIF
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