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need help with understanding an instructable's schematic Answered

I'm not very good at understanding schematics I guess, and am trying to understand the schematic at https://www.instructables.com/image/FT6P10TGTTUHASZ/Assembly.jpg .

I've created a rough translation of it at https://www.instructables.com/files/deriv/FQV/10DS/GU2QYOY1/FQV10DSGU2QYOY1.MEDIUM.jpg .

Can someone fill in the polarities at the question mark locations and confirm that my interpretation of the wiring intersections is correct please? I'd appreciate any help available. Thanks!?

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Jack A Lopez

8 years ago

I think this picture:
https://www.instructables.com/file/FMHSSTQGTGCR7XS/
from here:
https://www.instructables.com/id/Easy-USB-charger/#step3

has sufficient detail to show you what wire goes where, if you look at the original sized version of it.  Even if you can't see the connections on the electrolytic capacitors, the negative (-) termnials of both of those are tied to the same place, which is pin 1, which in this case is "ground" for this circuit.

I mean even if you can't grok the diagram, I think the picture linked above is is clear.

BTW, comparing your diagram and Brunoip's, it looks like you've switched terminals 3 and 4 in your diagram.

I hope something I've written here is helpful.

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Re-design

8 years ago

Change the resistors to capacitors and #2 and @4 are positive. #3 has no connection.

On the original drawing, ground on the right is negative usb.

I think you have some more work to do.

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aeneas shrikeRe-design

Answer 8 years ago

thanks. I didn't realize that I had mislabeled the capacitors as resistors. I've changed the image. Thanks for your help!

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steveastrouk

8 years ago

There AREN'T any "resistors" in the original circuit !

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aeneas shrikesteveastrouk

Answer 8 years ago

Right. Sorry. I mislabeled them. I actually already have the capacitors from radioshack. Thanks I'll change the drawing.