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This Instructable will show you how to build an adjsutable breadboard power supply entirely from Radioshack parts. It can provide multiple voltages di...
The LM317, according to Wikipedia, is an integrated three-terminal adjustable linear voltage regulator. It supports input voltage of 3V to 40V ...
The following formula will allow you to calculate the resistor values to set the LM317 to any voltage that you need:R2=R1((V/1.25)-1)A standard R1 Val...
Barrel Jack--------------------------------SalvagedSwitch--------------------------------------275-409Rectifying Diodes-----------------------276-1653...
These tools are common hobbiest items, most people should have: Soldering Iron Solder Solder Wick Wire (RS # 278-1221) Multimeter Various Pliers...
This is your basic LM317 Schematic, with the DIP switch and the resistors added(Look at Notes!!):
The Following steps will detail the construction of this power supply.
Take your scrap PCB, and mark outside a 7x8 rectangle. Use your large scissors to cut inside this rectangle. You should now have a 6x5 box. Cut this d...
If you have followed my parts list, you should be able to copy this layout for your board.
The Following pictures detail the steps of marking and drilling for the barrel jack. I used a 7/64 drill bit for the mounting holes.
The following Instructions will detail the construction of this power supply.
After you have the board layout completed, mark every part hole with a permanent marker so you can easily stuff the board.
Remove all of the components except for the resistors. Place a piece of Duct tape over all of the resistors, holding them to the board. Turn it over, ...
Place the capacitors in their positions, noting polarity, and put the tape over them. Flip it over, solder the components, clip the leads, and remove ...
Mostly the same as the last step, and remember to note polarity. LOOK AT THE PICTURE NOTES. Put them in their places, put tape over them, solder, clip...
Put the switch in place, it shouldn't need to be taped. Flip it over, solder, cut the leads, and flip the board back over.
This is probably the hardest part to solder, because the jack required me to drill out the pad, You have to solder to a nearby pad. You shouldn't need...
Again, more soldering. Tape the DIP switch in place, solder, remove tape.
Final Part!! Put the regulator in, tape it, solder it, cut the leads, And your done!
To connect the power supply to the breadboard, use 8 header pins and your 2x6 strips. Solder 2 sets of 2 header pins to the board where it will plug i...
The following schematic shows which connections are to be intentionally bridged and which are to be connected with jumpers. The other pictures show my...
Your Done!!! Now that you have the power supply assembled, test every voltage to see if it is close enough to your desired voltage.
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Posted:Jun 28, 2007
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