Pin 15 is VCC – the supply voltage to the SG3525 that makes it run. I've mentioned this in the article above: I'd say they're pretty good and certainly good enough for your purpose. I've used ExpressPCB and PCB123 (a little bit of EAGLE as well). Go through the manual and start using it. There are other free PCB design software available as well. There are many free PCB design software you can use to design the PCB yourself.Ĭadsoft EAGLE (freeware with limitation): Try to use a low-ESR capacitor.ģ) Unfortunately, I don't have the PCB design for this. If it's higher than that and close to 400V, use 630V.Ģ) It is an electrolytic capacitor. A 400V capacitor would be good since I assume your output voltage would be lower than 330V. 1) Make sure the voltage is higher than the maximum output voltage.
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