The 3.3V regulator gets quite toasty as it draws most of the 0.72A when the rig is receiving. I just measured the temperature of the heat sink on the regulator with a infrared thermometer and it is 152F. A larger heat sink or a fan sure wouldn't hurt anything.
Jack, W8TEE
On Tuesday, January 22, 2019, 3:15:43 PM EST, Lee <mr.olson@...> wrote:
On my first uBitx I used 2 fuses.? .5A for the board and 2A for the output transistors.? I am thinking of adding a 3rd for the JackAl board.?? 1.5A for each regulator and 2A for the amplifier for a total of 5A.?? Does this sound about right?
I put a temperature controlled fan on my original uBitx blowing on the output transistor heat sinks.? Some members do not use a fan. ? The case I am using has vent slots top and bottom. ? Should the JackAl board need a fan or just one blowing in to the case and let the vents take care of the heat?
I also want to add a special thank you to Jack and Al for all their hard work to give us this much fun and to the members for helping other members. --
jjpurdum