I created a temperature test setup for my TCXOs. Relay control did not last long because the relay was operating once a second or so and the Peltier uses a lot of current. The relay contacts welded in a few hours. Luckily I was watching when it happened. A PID controller running H bridges works a lot better to control the temperature accurately. I made a custom control algorithm that ramps the temperature up and down and takes frequency readings. There are temperature control algorithms that are supposed to automatically tune the system gains, but I have not tried them.
https://sites.google.com/site/markstcxo/home/test-jig 73, Mark W7MLG On Sat, Oct 12, 2019 at 7:00 PM Perry Sandeen via time-nuts < [email protected]> wrote: > Yo Bubba Dudes!, > The suggestion was made to use a ebay item number 192112054053 heater for > this project. > Now it's cheap and has a digital reading. > BUT > It is a bang- bang controller using a relay. At some point that relay > will stop working. Also all designs I've seen for good temperature control > use proportional solid state controllers. There are plenty of free designs > on the internet. > Lastly, if one believes that this is long term reliable controller that > will deliver .1 degree accuracy, for that price, please contact me off line > and I will set you up with some really cheap (but slightly scorched and a > burned wood smell) lots to where you can build your dream home here in > California. > Regards, > Perrier > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
