Products > Test Equipment
Small/cheap programmable PSU?
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Per Westermark:
Anyone know about some smaller and reasonably cheap programmable PSU suitable for automatic testing?

Most programmable laboratory PSU are normally quite big and bulky.

What I'm interested in is having 5-10 programmable PSU 0-30V and maybe 0-1A per channel and controllable using any of USB, RS-485, RS-232, Ethernet.
Either multiple small units or some PSU with maybe 2-4 channels or intended to stack together for arbitrary channel count.

Potentially also programmable voltage sources as low as 10-25 mA current capacity for driving stimuli to analogue inputs.

No need for lots of fancy displays capabilities.

The intention is just to be able to run automatic firmware testing, power save logic, analogue input processing etc for quite low-powerd equipment running supporting 9-30V operation and power consumption in the 1-10W range.

Filling the table with many 150-300 W laboratory PSU would be a big waste of space.
MLXXXp:
If a switching supply is acceptable (considering output noise), something like this might work for you:
https://www.aliexpress.com/item/1000004279003.html

You would have to feed it with a high enough fixed DC voltage and sufficient current. You might be able to use a single supply to feed all the multiple modules you're looking to have. You  also might need a case or panel to mount them in. The company does sell cases for them.

I believe the control protocol is documented. I think third party "hacked" alternative firmware is also available.
Per Westermark:
Switched is definitely acceptable. It's only maybe 1-2 channels for testing analogue inputs that might have an advantage of less noise - but equipment for automotive use really can't put much depands on well-filtered input voltages.

I'll have to take a look if they looks reasonable - how to control them and any issues with isolation.
MLXXXp:
Some information on the control protocol:
https://sigrok.org/wiki/RDTech_DPS_series
MLXXXp:
Here the thread for Dave's review of a similar model,
https://www.eevblog.com/forum/blog/eevblog-1030-$20-diy-bench-power-supply!/

This post links to some fairly good info for communicating with the DPS3005.
https://www.eevblog.com/forum/blog/eevblog-1030-$20-diy-bench-power-supply!/msg1319709/#msg1319709
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