Recommended power supply

[Scorn]

Hi,

Just ordered a TouchDRO kit and I’m looking for a power supply. Could anyone please recommend one that is known to be good? I can use my bench power supply to build it, but I need one to use on the lathe. I’m pairing it with Shahe 5403-x scales. 

Thanks for you time.

[Yuriy]

Scorn,
Pretty much any power supply that can provide 5V-9V and 100 mA is good. The board has a built-int linear voltage regulator, so it will clean up the input. The components can witstand 13V (or probably more), but 9V nominal max is safest.
Regards
Yuriy

[Scorn]

Thank you

[JoeyG1973]

I just bought this whole thing.

If you wasted your money on the "cheap" magnetic scales your best bet is to get a true isolated power supply.  Mine jumped all over the place with the igauging absolute dro scales.  

I tried several wall warts(smart and otherwise) and they are all garbage. 

Get something like this and set it to about 9V.

https://www.amazon.com/dp/B07QVXYBDC/ref...UTF8&psc=1


It's going to cost you more in time, effort, and money to make these low resolution scales be electrically isolated than it is to just straight up buy cheap chinese 5um glass scales and the new glass scales adapter.  They are way easier to mount because you don't need to worry about electrical isolation and frankly at 50-100 US for them you get way more accuracy.

That said even buying the newer glass scales and the newer glass scale adapter I am ahead of the game with TouchDRO.  And if this project ever goes under you can buy a DRO that will work with the serial connectors on your scales where the magnetic scales that are horrible for resolution are useless.

[Scorn]

I was planning on isolating them by powering them with batteries anyway. Figuring out a system is half the fun for me.

[Yuriy]

I still don't know what is the root cause of position jumping. I know that newer scales (especially EZ-View DRO Plus) very rarely have this problem. Some "new old stock" unbranded copies of the DigiMag scales have the highest likelihood of jumping. it's not as simple as just the noise of the power supply. Last year I was helping a guy figure this out. He had three scales. One was rock solid, no matter what he did to it, and the other two were all over the place (that was with a pre-made board). I sent him a different board, which had absolutely no effect, so in the end, I bought the two bad scales from him, and he ordered two new scales. The new scales worked fine, but the two "bad" ones work like a charm in my house. I can't get them to jump, even with five VFDs running/stopping/starting in the garage.
It is definitely some sort of noise, but I suspect it has to be at just the right frequency for the given cables, etc. I'm trying to play with the input impedance a bit (just ordered a few different prototypes) to see if that makes any difference. I don't think it's a power supply issue, though. The boards and the kit have pretty decent voltage conditioning. This was much more of an issue with scratch-built LaunchPad adapters.