Mk160 transistor & LDR polarity check

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1

I’m building my mk160 (Remote control via cellular phone) and have 2 last things to put on it. Both the transistors and the LDR. However, I dont know how to position them.

How do I check the polarity?

I dont have any measuring tools, but the capicators do say “104.” which can be used to determine polarity.

2

Hi,

C2, C3 and the LDR are not polarity sensitive.
If you look at the print on the board for the transistor you will notice one side is flat the same as the transistor itself.
C1 is polarity sensitive and the (-) negative leg is mark on the case.

I hope this helps.