me and my friend are working on a mk160 circuit boar. it's a remote controll through cellular phone. the board is all but done but we're stuck on 2 capacitors and a ldr.
there's no markings on the capacitors or the ldr to determine polarity. How can I do this without testing equipement?
they're 100nf capacitors and there's "104." written across it wich could be used to determine + and -
Can anyone help with this?
oh yeah, the negative pole always needs to be pointed towards the large conductive path that covers most of the pcb right?
LDR's are just resistors and 100NF will have no polarity. You can connect them iether way on the circuit. But when it comes to Electrolytic capacitors, you'll find a - mark for the negetive terminal or the negetive terminal will be shorter than the posetive.
Cheers
Hi,
"100nF will have no polarity" is true only nowadays, by modern capacitors, then some older types as Tantalums(they oesexist from 100nF todays too) & such earlier ceramics with very HighDiel.Const. versions have had in a direction (also polarised) better worked (or some type would be "selfpolarized" after longer working time too)...
They have had (mostly) a "shorter line" marking to one contact too as by diode Cathode...
K.