Moonshot Cap Voltage

[dontstaylong]

Hey all -

Quick question: the PCB screen for the Moonshot says it needs 16v caps, but I don't see any mention of that on the schematics or diagrams.

I ordered 100v caps. I'm assuming this is a pretty novice question, but will it mess things up if I use the ones I ordered?

 

[Nostradoomus]

which caps did you order? 100v electro caps may be too big to fit comfortably on the board but maybe not

 

[dontstaylong]

According to the Tayda order:

10uF 50V 105C Radial Electrolytic Capacitor 5x11mm SKU: A-4554

100uF 25V 105C Radial Electrolytic Capacitor 6.3x11mm SKU: A-4541

47uF 100V 105C Radial Electrolytic Capacitor 10x12.5mm

​

"See if they fit" is a level of troubleshooting I probably should've checked first.

 

[Nostradoomus]

you'll have trouble fitting the 47uf caps in, but you can just leave the leads long and bend them over the board or mount them from the bottom in the same fashion, the others should be fine

 

[Nostradoomus]

IE:

 

[dontstaylong]

Thanks. Was thinking of bending them if needed, but wasn't sure if the voltage would be an issue.

From an electronics perspective, what is the difference between, say, a 47u 100v vs a 47u 16v? I know this is basic stuff, just trying to wrap my head around some of it.

 

[Nostradoomus]

the rating is how much voltage can be safely applied before the component is stressed or fails (usually with a spectacular pop and smoke lol)

 

[Nostradoomus]

most of what we use are 25v and under. Boards that use a charge pump to put out 18v will require 25v caps at minimum (which will be in the build docs)

 

[dontstaylong]

Haha okay cool. Makes sense! Wasn't sure if that related to the speed at which it charged or discharged or something.

 

[Nostradoomus]

nope, that's the capacitance value

 

[GizzWizzKing]

A quick word to the wise on those clampy PCB holders you have pictured, be careful because the teeth can bite and scrape through the masking exposing the copper pours beneath. Generally not an issue but it can open the door to some problems. Mine have some rubber nubs that I use to avoid this.

 

[dontstaylong]

Yeah, I've noticed this. I think I'm due for an upgrade.

Also, hooray.

 

[Nostradoomus]

A quick word to the wise on those clampy PCB holders you have pictured, be careful because the teeth can bite and scrape through the masking exposing the copper pours beneath. Generally not an issue but it can open the door to some problems. Mine have some rubber nubs that I use to avoid this.

you can fold up some paper towel in there too for the time being

 

[GizzWizzKing]

Electrical tape is another option that keeps some grip too.

 

[Feral Feline]

I put heat shrink-tube around the jaws of mine.

The teeth eventually wear through, but then I just replace the warn out shrinkerage with fresh shrink-tube.

Tips:
Too little heat and they will fall off or work their own way off;
however, don't heat up the shrink-tube too much, or the teeth of the jaws will work through the tube sooner than later and you'll need to change shrinks more often 'cause it'll drive you crazy.