Anyone know Portable Variable Power Supply?One of the tools that any electronic hobbyist should have in their kit is a portable, veritable power supply.The build is a relatively easy and only needs some basic solder skills to make.

　　Step 1: Parts


　　1. Charger and step-up module

　　2. Battery. You can use an old (or new) mobile battery, 18650li-ion, or almost any other rechargeable battery

　　3. Voltage meter

　　4. SPDT Switch

　　5. 250K Pot -

　　6. Female and male banana plugs .The female ones I have linked are 4mm and these fit nicely into the case.

　　7. Alligator Test Lead Clips

　　8. Hook Clip Test Probe

　　9. For the case I used a 2 X AA battery holder.

　　10. Wire

　　Step 2: Adding a Potentiometer to the Module


　　The module has micro potentiometer on it already but is way too small to use easily. However, the good people who developed this module also added some holes to solder on a potentiometer. The value of the pot is 100K and allows the voltage to go up to 14v. If you want to go higher then add a 250K pot which should bring it up to the full 30V's.

　　Steps:

　　1. Place the pot into the holes of the module. There is a SMD resistor right behind the pot which makes it angle down. To rectify this you can added a slither of thin plastic to the front to make it sit straight

　　2. Solder in place the pot to the module

　　3. Becarful when adding the solder as there are a couple of solder points very close to the potentiometer ones and you don't want to bridge them.

　　Step 3: Adding Some Wires to the Output


　　Next you need to solder a couple wires to the output on the module. These are the solder points RenhotecIC mentioned in the previous step.

　　Steps:

　　1. Add a little solder to the solder points one the module

　　2. Carefully solder on a couple of wires to each of them

　　3. Check to make sure that there are no solder bridges between the pot and the output

　　Step 4: Modifying a AA Battery Holder to Make the Csse


　　Steps:

　　1. First, you need to remove any gussets and pieces of plastic inside the battery holder. Use a pair of wire cutters to remove this.

　　2. The case actually comes with an on/off switch so you can utilize this if you want to. mine was broken so  can removed it as well and added a toggle switch

　　3. If you are going to add a toggle switch then you'll need to drill a hole into the bottom of the holder at the end where the original switch was located

　　4. Lastly, drill a couple holes in the side of the battery holder for the banana plugs to go into

　　Step 5: Adding the Banana Plugs to the Case


　　Steps:

　　1. Pull the banana plugs apart. To make sure there is enough room in the case, I removed one of the plastic rings on the banana plugs

　　2. Place the plug into the hole and add the small plastic ring to the other side

　　3. Secure them in place with the small nut provided

　　Step 6: Drilling, Sticking and Soldering

　　Steps:

　　1. Place the module on top of the battery holder and mark out where the holes need to be drilled into it. You'll need some holes for the battery wires and also the output wires so 4 in total for the module

　　2. Do the same for the voltage meter, you'll need 2 for that

　　3. Make sure you solder wires to the module for the battery and output before you stick the module into place with the double sided tape.

　　4. Thread the wires through the holes and secure the module

　　5. Solder the output wires to the solder points on the banana plugs. You'll also need to solder the wires from the volt meter to the same solder points once it has been attached to the case

　　Step 7: Adding the Voltage Meter and Battery


　　Steps:

　　1. Like you did for the module, thread the wires on the voltage meter though the holes in the case and secure it with double sided tape

　　2. Connect positive to the red banana plug and ground to the black one

　　3. Solder the battery wires from the module to the battery. Check and make sure you have the polarities right.

　　4. before you secure the battery, test to make sure everything is working as it should. Make sure the that the micro pot that comes on the module is turned fully anti-clockwise. This will ensure that the pot added to the module will work smoothly

　　4. Use some superglue to secure the battery to the bottom of the case.

　　Step 8: Making Some Connectors


　　You can buy different connectors such as the alligator and hook type test clips. However, If you want to use the regulator on a bread board you'll need to add a couple of jumper wires to some male banana plugs.

　　Steps:

　　1. Cut the end off a long red and black jumper wire

　　2. Add a little solder to the ends that you cut off and secure each of the wires into a male banana plug.

　　3. There isn't any other steps - you're all done!

　　RenhotecIC has focused on the field of electronic connectors. we have unparalleled experience in production and product technology. we have achieved the combination of product quality and technology.