[time-nuts] What's the latest correct PICTIC II Mouserproject?- Heathkid

Bob Camp lists at rtty.us
Sat Aug 14 16:14:21 UTC 2010


Hi

If you are going to match, do it for speed on the transistors and switching diodes. Once that is done do the Vbe stuff.

Bob



On Aug 14, 2010, at 11:43 AM, "Heathkid" <heathkid at heathkid.com> wrote:

> Okay Stanley... I've got a Tektronix 370A curve tracer at work.  So the diodes need to be matched?  No problem.
> 
> So I match the diodes and the resistors to within 0.001%.  Are there any other components that need matched?  Also, you mentioned using hemostats as heatsinks on the diodes while installing them.  I know that diodes make very good temperature sensors as well.  Are there any suggestions on keeping them stable after they are on the board?  What is the recommended operating temperature of the PICTIC II?
> 
> Thanks.
> 
> 73 Brice KA8MAV
> 
> ----- Original Message ----- From: "Stanley Reynolds" <stanley_reynolds at yahoo.com>
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Sent: Saturday, August 14, 2010 10:43 AM
> Subject: Re: [time-nuts] What's the latest correct PICTIC II Mouserproject?- Heathkid
> 
> 
> <snip>
> 
> Maybe we should buy lots of diodes to match them, they are relative cheap, also
> use extra care installing them. Using hemostats as heat sinks and just enough
> heat for a good connection do not want to damage/change them after the match.
> 
> Stanley 
> 
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