I suggest decreasing R3 and R4 to 120 Ω to ensure that 10 mA is drawn from the regulator. The LM317/337 require a minimum current of 10 mA (worst case) to regulate. You'll have to recalculate R5, R6 accordingly. I also suggest adding a thermal pad between the ICs and their heat sinks to ensure good thermal contact.
Nice boards, though.
Tom
Nice boards, though.
Tom
Yes, i have to add this indeed. The heatsinks are not connected to anything, so the regulators don't have to be insulated.
The leds are connected to the output, I was hoping this is enough load for the regulators to work without connecting anything.
Very nice job.
They also make awesome current sources. 470uf to 1000uf on the output and the noise is gone.
Make PCB is a PCB manufacture working out of China.
I was asking where did you get the boards made. They look like the same process
as MakePCB
Ah sorry, it is 'itead'
https://www.itead.cc/open-pcb/pcb-prototyping.html
$19.90 for 10 boards of 10x10cm
Another powersupply that I'm working on. LT108X low drop regulator in combination with switchable mode: normal/voltage doubler and soft start.
Circuit was designed by somebody else, I made the layout.
Can be used for tube amplifiers when only 6.3V is available as heater supply. Als usable as normal powersupply.
Circuit was designed by somebody else, I made the layout.
Can be used for tube amplifiers when only 6.3V is available as heater supply. Als usable as normal powersupply.
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