Noob seeks LM7805C power regulator help

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Noob seeks LM7805C power regulator help

Postby The Flannel Wood Tic » Thu Feb 09, 2012 4:04 pm

Last December I Purchased an Adafruit ARDX - v1.3 Experimentation Kit for Arduino (Uno R3) (v1.3). At that time Adafruit was including a bonus kit for a power regulator with the purchase. I received everything as described. I am new to electronics and as such I need some kind of instructions for assembling the power regulator. I have searched the web site but am unable to find any specific information for assembly of the components that were sent to me.
Here is a list of those components:
2x electrolytic capacitors, 220uF and 47uF
2x ceramic capacitors 100,000 (104) uF
1x LM7805C linear power regulator
2x LEDs, 1 red 1 green
1x slide switch
1x DC barrel plug
2x 1K 5% resistors
1x 1N4001 diode
Can anyone point me to an appropriate set of instructions, or schematic, I can use to assemble these parts? Thanks for the help, you guys are awesome.
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Re: Noob seeks LM7805C power regulator help

Postby franklin97355 » Thu Feb 09, 2012 4:12 pm

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Re: Noob seeks LM7805C power regulator help

Postby The Flannel Wood Tic » Thu Feb 09, 2012 4:59 pm

Thanks for your helpful reply and advice Franklin97355 ("It helps if you Google first before asking.") FYI, I did Google first and, in fact, read through the site you referenced (several times). As I said in my post, I am looking for either instructions or a schematic that I, as a Noob, can use to assemble the power regulator using the parts I was sent. I expect that only Adafruit knows why they sent me the components that they did, and so only Adafruit can answer my question. Are you listening guys? :?
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Re: Noob seeks LM7805C power regulator help

Postby Zener » Thu Feb 09, 2012 5:26 pm

Was there a circuit board supplied for those parts?
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Re: Noob seeks LM7805C power regulator help

Postby lesizz » Fri Feb 10, 2012 4:42 am

Hokay. First check this page:
http://stuff.nekhbet.ro/2006/06/18/how- ... -7805.html
Wire it similar to this.
--Put the larger electrolytic on the input side and the smaller on the output side. Watch polarities!
--Put one each ceramic cap on input and output. These are not polarized.
--Put switch in series with diode to act as a power switch.
--Put resistor and LED in series and hook across output to common. This will act as power-on indicator. Watch polarity on LED.
--You need to hook an AC or DC source across the anode of the diode and the common. The voltage would need to be say, 8-12V. A wall wart should work, if it can supply enough current for your project.
--The remaining resistor you can hang across the output to stabilize at low loads.
--And the barell plug you can use to connect to the death ray, or whatever project it is you want to power with this supply.
--At some point if you want to progress in this hobby you need to get a book or website that will provide progressive turorial on basic electronics. Electronics is great fun, but you gotta know the basics.
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Re: Noob seeks LM7805C power regulator help

Postby The Flannel Wood Tic » Fri Feb 10, 2012 10:33 am

Lesizz, thank you very much for the help. I am about 3 weeks into my first electronics course, so, as you can imagine, designing a power regulator circuit is still a bit in my future. I have followed your instructions... with success. Now I have a power supply. Thanks again.

Zener, I did not receive a PC board with the other components. I will use a breadboard.
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Re: Noob seeks LM7805C power regulator help

Postby Zener » Fri Feb 10, 2012 12:17 pm

That 7805 can get really hot depending on the Vin and the Iout. Don't grab it with your finger! You could get burned if it is hot. It might need a heat sink on it.
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