On Tue, Jan 17, 2017 at 9:23 PM, Li Ang <379...@qq.com> wrote: > Hi > I am wondering if anyone tried to put a Rb unit into a vacuum container. > And how much the performance is improved?
Vacuum is a VERY good thermal insulator. If the electronics used even just a few watts of power you'd need some way to cool it, other then convection. Almost all electronics depends on air for cooling. You'd need to redesign it for conductive or radiative cooling. That is not easy. I did something very simple that works. I placed the Rb unit in a metal box and used a thermostatically controlled fan. The fan speed is controlled by a PID controller. It all runs on one 8-pin AVR chip, I use two analog inputs for two temperature sensors (one epoxied to a heat sink and one in free air. Another pin is analog output to control the fan speed. In improvement would be to use a three wire fan with a tachometer. I tried before to make an analog fan controller but without using a dozen op amps it is hard to implement any kind of decent algorithm. But BEFORE you try and improve the Rb performance you need to have some way to MEASURE its performance. This is likely much harder. -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.