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I have made a variable voltage power supply from an old computer atx, but as I am doing more precision electronics projects, I would Like to buy a Lab power supply.
I would like to spend about $100 - $150.
I would appreciate any advice before I buy one.
Tell you what are from ， i know a electronic parts Retailer，their main market is usa，i dont sure if you can find a cheap one，but i often find cheap parts on there，the ebay is a good place to buy
I recommend the TekPower TP3005P programmable power supply. The manual interface kind of sucks and requires several button presses to set, but the hardware is rock solid and people have already reverse engineered the serial protocol and written code for it, myself included (programming to use to charge batteries for example, is a snap). Here is the review on Amazon, see comments for links to code, try google etc:https://www.amazon.com/gp/customer-reviews/R22P17TU9LSNN2/
If you want to put some work into it, one of these modules might be a viable option: https://www.youtube.com/watch?v=Cw2AjcczHg4
You definitely want one that shows both the current and voltage at the same time. I tend to like the ones where the current measurement is one color LED display, and the voltage is another color. Typically one is green and the other is red. With four displays it is nice to know which is current and which is voltage easily. Also I feel the red/green LED displays are easier to read than the back lighted ones. I have a triple supply that has two 0-30 volt supplies at 5 amp, and one fixed 5.0 volt supply (was ~$199 on amazon). Every once and a while it would have been nice to have at least one channel that was higher current. I use the current limiting adjustment often when testing/troubleshooting new circuits.
Thanks for your advice, Could you please tell which model you bought on amazon.
I looked in my old Amazon orders list and it said it was a HY3005F-3. It is not available from the company I purchased from before, but there are other companies now that sell it. Just search on amazon web site with that model number. Mine looks exactly like the one sold now by RSR Electronics ($187.20 + 10.80 shipping). Try link: https://www.amazon.com/Triple-Linear-Power-Supply-30V/dp/B004ISD7T6/ref=sr_1_3?ie=UTF8&qid=1523480016&sr=8-3&keywords=hy3005f-3&dpID=511RYOHL1bL&preST=_SX342_QL70_&dpSrc=srch
Any ones like these should be finehttps://www.ebay.com/itm/152857636147?ul_noapp=true