I have been teaching copper etching using salt water and a 6 volt flashlight battery with great success for years now.
I recently purchased this rectifier to use as a power supply from Rio Grande:
Digital 3-Amp Plating Rectifier
Item #: 335201
I thought it would work great and save on disposing of so many batteries.
I thought I could set it to a certain voltage and away you go, but I turn everything up as high as it will go and sometimes it etches and sometimes nothing is happening. The voltage and amps seems to fluctuate on their own?
I am wondering if this was the wrong unit for this application or am I doing something wrong?
Thanks in advance!