the_engineeer
Member
Hello!
I am building a digital clock using the schematic on this page: https://danyk.cz/hodiny2_en.html
A neat thing to add would be a backup capacitor in case of a power failure, but I have never used these before so I'm not sure how to properly add one to my build. The space available is small width- and heightwise so only a 0.47F fits, but it is however quite long so there is room for up to three 0.47F in a row.
Then again, I read somewhere that it isn't always a good idea to parallell supercaps so I wanted to know your thoughts on the matter.
Also, if my "capacitor circuit" below is correct, how do I calculate a fitting value for R?
As you can see, my idea is to only have the clock circuit backed up and not the actual LED display.
I am building a digital clock using the schematic on this page: https://danyk.cz/hodiny2_en.html
A neat thing to add would be a backup capacitor in case of a power failure, but I have never used these before so I'm not sure how to properly add one to my build. The space available is small width- and heightwise so only a 0.47F fits, but it is however quite long so there is room for up to three 0.47F in a row.
Then again, I read somewhere that it isn't always a good idea to parallell supercaps so I wanted to know your thoughts on the matter.
Also, if my "capacitor circuit" below is correct, how do I calculate a fitting value for R?
As you can see, my idea is to only have the clock circuit backed up and not the actual LED display.