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PICKIT 3 External Dual Power Supply (3v3-5V)Author
Giorgos Lazaridis
August 28, 2013

PAGE 2 of 2 - PICKIT 3 External Dual Power Supply (3v3-5V) PCB

Parts and PCB
Here are the parts and the PCB that i used for this project:


First, i had to modify some parts for my design. I got some long 0.1'' pitch connectors. These have to be kinda longer than the normal 0.1'' ones. With a pair of pliers i bended to 90 degrees. I also moded a slide switch. With the cutter i removed one terminal that was not nessecary:

I decided not to print a PCB for this project. Instead, i used a perforated PCB that i had in stock some 15 years...

I cut the PCB to the final dimensions With the dremel i had to do some cuts on the lines

Then i soldered the parts onto the PCB. I used an old Nokia charger to provide power to the circuit. It can provide as much as 750mA at 6.5V.

This is the idea:

A final touch
And then i decided to add an LED just to indicate if the circuit is under power or not. A simple green LED with a 220 Ohms resistor connected to the output of the circuit will do the trick:

Just a green LED and a 220 Ohms resistor I trimmed one lead of the resistor and one lead of the LED And then i soldered them in series...

Finally, this is what i got:


Testing the results
Testing the output for 5V and 3.3V with the Fluke 87V:

5.1V - Its like 0.1V more but still well within the acceptable range 3.3V - It performs perfect at 3.3V

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  • At 18 May 2014, 4:29:23 user Cristi wrote:   [reply @ Cristi]
    • Hello. Idea is OK, but not necessarily quite discontinuing of Vcc from pickit3?

  • At 24 September 2013, 19:11:30 user jdraughn wrote:   [reply @ jdraughn]
    • You might want to insure that the switch you use is a make before break, otherwise the voltage will spike as you switch from one voltage to another.

  • At 23 September 2013, 21:20:51 user solipso wrote:   [reply @ solipso]
    • @Giorgos Lazaridis
      Nevertheless, the idea is great as we, lazy dogs, always like to power our PIC circuits directly from PICKIT - regardless the current needed. Your hack justifies this bad habit and makes us look a bit less silly, though.
      I also like these switches very much, especially with multiple poles and with good contacts (surely not those eBay cheapies with 0.3 to 0.7 Ohm ON resistasnce).

  • At 23 September 2013, 17:09:18 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @solipso My original design involved a HDD jumper. Jumper ON means 5V, otherwise 3.3. It was safe enough, but then i saw my stock bin with these sweet slide switches... I just could not resist.

  • At 23 September 2013, 13:58:58 user solipso wrote:   [reply @ solipso]
    • @Giorgos Lazaridis
      Surely it does! :-) Nevertheless, this is based on my very own experience. I have had something like this on my breadboard PSU and I killed quite a lot of devices stupid enough to get killed by humble 5V before I realized to shorten the lever to about 3mm, which proved to be enough to switch easily, but intentionaly only.

  • At 23 September 2013, 13:50:38 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @solipso And this makes things more interesting, doesn't it???

  • At 23 September 2013, 12:16:23 user solipso wrote:   [reply @ solipso]
    • The long protruding lever of the voltage switch literally asks to be switched to 5V when the rig is connected to 3V3 micro and let the magic smoke escape free.

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