[time-nuts] Rb video

[Dr. David Kirkby]

On 9 August 2013 03:50, Mark Sims <holrum at hotmail.com> wrote:

Hi Mark,

I'm not sure why you needed to start a new thread - why not just add
to the old one?

> I also use a blinking status LED controlled by an ATTINY13 AVR chip.  It also reads a temperature sensor and controls a PWM'ed fan.  The LED blinks out the temperature.

In Morse Code? Now that would be a bit of fun!

If has he says that has an open-collector output, I can't understand
why one would not just add a resistor and LED and use it.

> BTW,  the guy made a lot of bad decisions in his build.  FOr instance,  he should have brought out the Rb frequency/PPS signals to BNC connectors and patched them externally into the input BNC's.  That way he could use any unused amplifier channels for other things.

I mentioned some things I felt were wrong, and one in particular (BNC
terminals) I appeared to be wrong about. But I also wrote I felt it
was unwise not to use the 1 PPS output.

But if you have other thoughts, about where he went wrong, apart from
those I mentioned in my post yesterday, I would be interested.


> If you want to get fancy, you can run a speed controlled fan on the heat sink to regulate the temperature. You still want to pick a temp that's as low as you can practically get it for your control point.

My unit arrived today. It looks OK. I've not tested it yet.


Dave, G8WRB