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In this instructible I finally made a device I can use on my tool bench / work station to deliver the needed power necessary for multiple applications.  When I am tinkering and manipulating various objects, I am always needing a power source.  Whether I am testing a laser, LED, DC motor, or electroforming an object, it drives me nuts fumbling through the various power transformers I have collected over the years in order to find the right source.  Well here it is.  The multi variable voltage and current controller.  This little doo-dad is setup to deliver .5-12 vdc and about .010 - 2.00 amps.  It has a built in voltage and current meter that has selectible readings from volts to watts, and amps to Amp Henrys.  It has adjustment screws that allows you to manipulate the voltage and adjust the current under load conditions.  I love it and wanted to share this with you.  I hope you enjoy it.  I believe this little guy will be great for all types of applications that I made a few more that I will be selling on Ebay.

Step 1: Parts / Tools

Parts:
Project Enclosure box from Radio Shack (You have questions...They usually don't have the right answers)
Voltage and Current meter from internet
DC to DC controller from internet
Bananna connectors from internet

Tools:
Dremmel
Solder iron
Drill
And my favorite "HOT GLUE"

Step 2: Component Assembly 1

For this application, I disassembled and modified part components so they would fit in my enclosure.
Please take a look at the picture notes.

Step 3: Top Enclosure Assembly

  1. I layed out the placement of the circuit board and scored the plate to prepare for the cutting with the Dremmel.
  2. Now to place the Bananna connectors by marking where the holes will be drilled.
  3. Finally I soldered jumpers from the out put side of the meter to the Bananna Connectors.

Step 4: Bottom Enclosure Assembly

  1. I placed the DC to DC controller in enclosure and marked where adjustment screws would be viewed and manipulated from the outside.
  2. I drilled a vent hole to help dissapate any possible heat.
  3. I permanently mounted the controller with Hot Glue
  4. Next I soldered the out put leads from the DC to DC controller to the Meter input.
  5. Finally I soldered the 12vdc 2amp max power source to the input leads to the DC to DC controller paying attention to polarity.

Step 5: Tested and Ready to Go

Final testing.

You can select between volts and watts or amps and Ah with selectible buttons.

I adjusted the voltage to have an output of 3.51 volts.  I can adjust the current once under load..up to 2 amps.

The input voltage is 12vdc with a max of 2 amps.
I can't find your parts list anywhere online, or the project you made for sale on ebay. What are the exact names of the voltage/current meter and dc/dc converter you found online?
I bought them out of Hong kong. If you want to purchase one, I will sell you one. It cost me 35 to build it.how about 50. If you are interested I will list it on eBay to keep things secure
<p>Hi Palombo,</p><p>I just came across your instructable and wonder if you still tinker with making a 2 amp rectifier? Could you make a 3 amp if we wanted, if so how much? And are you in USA?</p><p> Pretty Please reply, MAC</p>
<p>I usually find the power supplies at garage sales or Goodwill type stores. From there I search on eBay for the dc-dc converter to match the power supply. EBay really has a good selection of converters nowadays. </p>
i'd buy one if you are still willing
sure thing. I use mine all the time. It works great as a variable led driver and small motor control. One issue I have for electroforming is once you connect the plating leads the led display goes dark. It still does the job but I dont like that aspect. I have to hook a flashlight bulb to it to set the desired current first. If you just want it for led stuff it is nice. Let me know if you still want it.
<p>wow thanks</p>
<p>Hi,</p><p>I would also like to purchase one if you are still making them. How do I find you on eBay?</p><p>All the best,</p><p>Phil</p>
<p>Hi,</p><p>I would be very interested in purchasing one of these if you still have any for sale.</p><p>Thanks!</p>
<p>Hi,</p><p>Will this unit work instead of a rectifier?</p><p>I really would like to get inot electroforming.</p>
<p>I have used it to copper plate and nickel plate jewelry and gun parts. It does a good job. </p>

About This Instructable

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Bio: I like to tinker and build things that seem fun to do.
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