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Quinton 03/03/2020
Board works well. Being a linear regulator it doesn't have swtiching noise. Parts: Kits had 2 incorrect resistors and I had to buy replacements. Terminal block had a broken pin so it couldn't be soldered to the board. Resistor leads are really thin but will work. This kit really needs a heatsink for the power transistor. This is not included. A fan should also be used if you want to use the power supply at the published specifications Build: Build is easy, part values are marked on the board which is nice but not by part number if you want to debug according to the manual. The diodes are all just tossed into a bag and to see the difference between the 1N4148 and zener diodes is quite difficult without a x5 or more magnifyier. The heatsink (which isn't supplied) is difficult to mount securely because there is no correct mounting method for whatever heatsink you may find to use. There is also no useful information about the heatsink design, how big etc. There is no insulating washer for the power transistor mounting to the heatsink (tab is at 30V) and the size of the transistor is larger than TO220, a TO220 mica washer won't work, I tried, the overlap touches the heatsink. The schematic doesn't show the 24V regulator and fan voltage Schematic is poorly printed, can't see pin numbers on parts properly Numbered points are not explained in manual Operation: I had one diode reversed and it didn't work initially. It wasn't easy finding the correct parts according to the schematic in the instructions. No part ref designators are shown on the PCB or the instruction. Once I changed my diode around it worked fine except the adjustable pot (U2 offset trim) did nothing at all. LED for CC and CV would have been nice, only CC LED is included An extensive discussion about this power supply and its improvements is available at electrocincs_lab.com https://www.electronics-lab.com/community/index.php?/topic/29563-0-30v-stabilized-power-supply/
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