Hi, i need some help determining the polarity for the input of an inverter.

the two lines are almost identical, but one has a capasitor first, and the other a fuse.

http://imgur.com/a/QawKi

 

Check the part number of the transistors and check if they are PNP or NPN (They will probably be NPN) One side of the input is connected via the fuse to the emitters. If the transistors are PNP then this is the positive. If they are NPN then the fuse side is negative. I think the thing you have called a capacitor is an inductor.

Les.

 

Check the part number of the transistors and check if they are PNP or NPN (They will probably be NPN) One side of the input is connected via the fuse to the emitters. If the transistors are PNP then this is the positive. If they are NPN then the fuse side is negative. I think the thing you have called a capacitor is an inductor.

Les.

Hi, thank you for your reply.

The transistor part number is '8050SS DF 331', which i think i found the datasheet for here:
http://html.alldatasheet.com/html-pdf/138717/JIANGSU/8050SS/293/1/8050SS.html

They're appently NPN transistors, and the base is connected to the side with the fuse.

To comfirm your sudgestion that the fuse side is thus negative, I got a ~100V output from a ~4V source, and as expected, when the polarity is switched there was no output.

But I expected the positive side to go through the transistors, and not the negative.
Why is this?