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Step 5Summary - Parts info & Tools
These circuits are worth memorizing. You will use them over and over again. A 7805 can quickly become an emergency cell phone charger. The 317 variable circuit can supply power to just about any circuit you can dream up.
Tools:
Wire cutters
Multimeter
Breadboard (optional - if you want to play with the chip without soldering)
Parts:
1 salvaged wall wart
1 78XX or LM317 chip depending on your circuit choice
Heat sink &Thermal Paste (see note below)
For the variable circuit:
1 resistor (around 240-300 ohms)
1 electrolytic capacitor (1uf and a voltage rating higher than your wall warts output)
1 ceramic capacitor (0.1uf)
1 potentiometer (5k - 10k)
1 small PC board/prototype board to solder everything into
1 Enclosure to house and protect the circuit and yourself.
HEAT SINK NOTE: I don't frequently use them and have had no problem, but I certainly always recommend them - especially if your circuit will run for long periods of time and/or go unattended. The chips have a metal flap with a hole in them to attach a heat sink. Thermal paste will aid in heat transfer.
Where to get parts:
These days, I tend to order from Digikey.com, and I'm not ashamed to say that I frequent Radioshack.
Digikey has an excellent part search system that lets you sequentially filter your results down until you find what you want, they have a HUGE selection, and they allow small quantities.
Radioshack has a bad rap. It's true that you'll pay more for stuff there (in some cases quite a bit more). When you just need to pick up a couple LED's and a switch, radioshack can be a life saver. It's near impossible to find this stuff anywhere else.
NEXT UP...
In part two I will take the wall wart out of the equation, and we'll build the whole thing from scratch.
Tools:
Wire cutters
Multimeter
Breadboard (optional - if you want to play with the chip without soldering)
Parts:
1 salvaged wall wart
1 78XX or LM317 chip depending on your circuit choice
Heat sink &Thermal Paste (see note below)
For the variable circuit:
1 resistor (around 240-300 ohms)
1 electrolytic capacitor (1uf and a voltage rating higher than your wall warts output)
1 ceramic capacitor (0.1uf)
1 potentiometer (5k - 10k)
1 small PC board/prototype board to solder everything into
1 Enclosure to house and protect the circuit and yourself.
HEAT SINK NOTE: I don't frequently use them and have had no problem, but I certainly always recommend them - especially if your circuit will run for long periods of time and/or go unattended. The chips have a metal flap with a hole in them to attach a heat sink. Thermal paste will aid in heat transfer.
Where to get parts:
These days, I tend to order from Digikey.com, and I'm not ashamed to say that I frequent Radioshack.
Digikey has an excellent part search system that lets you sequentially filter your results down until you find what you want, they have a HUGE selection, and they allow small quantities.
Radioshack has a bad rap. It's true that you'll pay more for stuff there (in some cases quite a bit more). When you just need to pick up a couple LED's and a switch, radioshack can be a life saver. It's near impossible to find this stuff anywhere else.
NEXT UP...
In part two I will take the wall wart out of the equation, and we'll build the whole thing from scratch.
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Just one little comment: "FIN" is literally the French word for "The End", it's almost the same than "Thanks for reading" (which translate to "Merci d'avoir lu".