Heeding Saul's warning this supply was only used for less critical uses, however preparing to make some calibration setups involving very low level measurements with the piezo Closed Loop Controllers & Stages we've been developing, the linear supply was not available so we grabbed the eBay "Lab Supply". During the course of trying to make some precision measurements the thought of investigating the impulse response of the Close Loop System seemed like a good idea, since the "Impulse" could be a tap from one's finger on the stage. This required an oscilloscope (scope) to "see" the system Impulse Response.
When the scope was hooked up, noise was everywhere, some was traced to the defective cheap scope probe (it's now tied up in a knot awaiting repair or the trash can), but way more noise than "should be" based upon the design. It turns out the d@#$ "Lab Supply" is spewing out noise, even unloaded and at zero output!! The old linear supply is nice and quite as it should be. Frankly I'm surprised the ultra high gain (136dB, or 6.3 million) precision Closed Loop System could handle the horrific noise from this "Lab Supply", but did so admirably!
Then decided to check the other +12V supplies we have, they all put out some noise as expected (they are all "switchers"), but nothing like the "Lab Supply"
The better noise +12V supplies we have all seem to be have the much thicker output cable and rated for higher currents.
Anyway, if your having problems with your electronics, look to the power supply as a possible source. Stay away from these cheap eBay "Lab Supplies" unless you need to run some LEDs, or motors, although I wouldn't use these for any precision stacking since the high levels of noise could interact with the current modulation features and create some sub-harmonic (intermodulation) effects in the motors.
If anyone else has these "Lab Supplies", please report what you find regarding the output noise. BTW most DVMs won't indicate this type of noise properly, so a scope is the best indicator.
Best,
