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Electronics HELP!

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Ed_McCarron:


--- Quote from: Bender on January 18, 2010, 12:23:54 pm ---GREAT!

I can do that!
sorry for the silly questions, but what kind of caps should I use for a bypass cap and what does it do?

--- End quote ---

Electrolytics, negative side to the ground pin of the 7805.  Values as in the pic.  Voltages - whatever you have, as long as its over whatever voltages you expect to see.  They'll shunt anything thats not DC to ground, keeping the 7805 from going into oscillation and eating itself.

Bender:

Thanks Everyone for the help! (and patience with the noob questions)

I'm gonna try it out tonight!

Bender:

Here it is my first little circuit, everything seems to be working now


Thanks Everyone and especially Ed for the diagram couldn't have done it without that

one more quick thing, do I also connect the ground? or just the heat sink, seems to work both ways but the light is a touch brighter if I connect the ground, weird

I gotta take a course in Basic electronics or get a good book, I wish I understood all this better :dizzy:

MonMotha:

Ground on the regulator needs to be connected to whatever's the "other half" of the power supply.  In this application, that should be the negative side of the battery.  I do believe the tab on the regulator (connected to the heatsink) is internally connected to the ground pin, so either works as a connection point, but use of the pin itself is recommended since your connection from the tab to the heatsink is probably not electrically good (anodized heatsink, etc.).

Bender:

MonMotha, thanks, that's the way I have it set up now and everything seems to be running smoothly
I'm going to test out how long it'll run on the battery and make sure nothing explodes
then run it a few hours plugged in to check it that way, before I put all this in a tiny cab

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