Capacitor help, codes and adding values?

[Narcosynthesis]

hello, for a project i am making i need one 330pf and one 470pf (for other 330pf caps i have used 300pf instead, but i dont have any more of those)

how do you go about adding and dividing the values? i have 100, 1000 and 220pf values, so would i be able to add these together in some way to get close to the desired values? how does connecting them in series/parallel affect the overall value?

also, i have some spare caps from other attempted projects, problem being i dont know what values they are... can you work the values out from the codes on them? they are -
473 (which is a small blue cap)
475 (which is a yellow blobbish (tantalum?) cap)

anyone able to help?

David

[nelson]

This tool is useful for working out the capacitance of capacitors in series. you need javascript installed to use it.

http://www.csgnetwork.com/seriescapacicalc.html

This link will teach you how to read capacitor value codes.

http://xtronics.com/kits/ccode.htm

And just for good measure and future reference here is a capacitance converter for converting between the different values nF uF pF etc.

http://www.electronics2000.co.uk/calc/convcap.htm


Enjoy and good luck.

[j0shua]

also are good software free to download on www.moyerelectronics.com :twisted:

[Narcosynthesis]

so that would make 473 a 47nf (47000pf) cap and 475 a 4.7uf (4700000pf) caps

for adding values, i think it works the opposite way from resisters, ie caps in parallell add values, and 1/ct = 1/c1 + 1/c2... for series capcitance

now for a way to work out if i can get the values i want from what i have...

David