Electronics > Projects, Designs, and Technical Stuff
Simple DIY Linear PSU
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panoss:

--- Quote from: xavier60 on March 07, 2020, 12:44:58 pm ---I like to place larger areas of copper print under power resistors.`

--- End quote ---
Are you referring to SMD resistors?
I 'm asking because through hole resistors are on the top side of the PCB, while the copper on the bottom.
xavier60:

--- Quote from: panoss on March 07, 2020, 02:24:45 pm ---
--- Quote from: xavier60 on March 07, 2020, 12:44:58 pm ---I like to place larger areas of copper print under power resistors.`

--- End quote ---
Are you referring to SMD resistors?

--- End quote ---
No, the axial resistors for R13, R14 and R18. As well as keeping resistance low, the extra wide print helps take the heat away.
xavier60:
With the early version PCBs  for my bench supply I was inputting unreg on one end and outputting on the opposite end of the PCB.
With later versions I put the input and output close together at one end of the PCB to avoid having long tracks carrying high current across the PCB.
xavier60:
About R15. I picked its value out of the air. Some consideration needs to be given to its possible high dissipation.
1 watt would be a safe choice and try to keep it away from electrolytic capacitors to avoid heat degradation.
xavier60:
My bench supply's PCB illustrates my layout suggestions.
C6 does not strictly need to be 1000uF.
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