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OPEN Power (Prototype 3)

I didn't have enough to buy a Lab Bench PSU... So I made one.

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Prototype 3: Utilizes a Boost Inverting IC to get +-13V and LDO's to Reduce the voltage between 0 and 12V. Both +- Rail Voltage Current and Power will Be displayed on a Full Color LED Display.

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Looking For Collaborators Especially this with Atmel MCU's. I am currently Woking with the SAMD21 With an Arduino M0 Configuration

This Project is to produce 3 final Prototypes. All Power Supplies will have USB Charging of Lithium Batteries and a Load Sharing. 

Prototype 3: Utilizes a Boost Inverting IC to get +-13V and LDO's to Reduce the voltage between 0 and 12V. Both +- Rail Voltage Current and Power will Be displayed on a Full Color LED Display. Will have a DAC Output, 2 Analog input and 4 DIO Pins. Since the circuit is completely analog the MCU can perform Double duty and Potentially be used as a crude Oscilloscope or Logic Analyzer.

JPEG Image - 240.27 kB - 04/05/2019 at 14:19

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  • 1 × ADP5070AREZ +- Dual Rail Switching Regulator
  • 1 × LT3081 Power Management ICs / Linear Voltage Regulators and LDOs (Positive)
  • 1 × LT3091 Power Management ICs / Linear Voltage Regulators and LDOs (Negative)
  • 1 × ATSAMD21G18A Microcontroller
  • 1 × MCP73831T Lipo Battery Charger

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  • Prototype 3:

    John Loeffler04/04/2019 at 14:19 0 comments

    Prototype 3a:

    I have got the board of  Prototype 3a back from the fab and populated it and uploaded the code.  Most functionality is working.  

    Problems:

    1) Current limiting on negative rail does not work.  There was an error in the Schematic

    2) The Positive rail only goes down to 0.62V when there is No load.  This is because the LT3081 Requires a 5mA Load for line regulation.  

    Prototype 3b: Revision Concept Includes DAC Output, 2X Analog Inputs(0-12V) and 4x Digital Inputs 3.3V (5V Tolerant)

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Lukas wrote 04/15/2019 at 09:13 point

Hi, i'm new here. I like your project but are there any possibilities to get the schematics or gerber files to produce this awesome PSU? 

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John Loeffler wrote 04/20/2019 at 19:36 point

Lucas,  I plan on doing a crowdfunding In a few months . I will have the design check for compliance and then i will release all the schematics, Gerbers, and Code.  I plan to keep it open souce but there are still some  bugs to be worked out.

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fdufnews wrote 04/05/2019 at 20:57 point

Very interesting project it gives breadboard a flexible power supply for the design of analog  fixtures.

But you shall correct "Converted a MT3608 Module into a Septic Converter." It is not Septic but sepic (for single ended primary inductor converter)

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John Loeffler wrote 04/05/2019 at 22:25 point

Thank you.  I made the corrections

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alireza safdari wrote 04/04/2019 at 08:56 point

Very cool and interesting project.
I think it would be a good idea if you could have one entry for each and put all of them in one list. I assume you will tell us about the specifications: current, ripple, etc so having different pages would help greatly. Although I need to mention that I am still new around here, so maybe someone with more experience can advise on this.

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John Loeffler wrote 04/04/2019 at 14:40 point

Thanks I am new as well.  I prefer to keep them together because one Builds off the others. 

As of right now I Have a working Prototype 3 made and most of the functions work.  The noise is less than 150uV (I have a very cheap oscilloscope though)

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AVR wrote 04/04/2019 at 08:16 point

even though I have a bench PSU, these sort of things for breadboard projects are always nice and valuable, your version adds many nice features, looking forward to ordering up a few for my lab!

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John Loeffler wrote 04/04/2019 at 14:25 point

Thanks I was thinking of keeping it open source for people who want to build on, BUT to a Crowdfunding Campaign (Kickstarter) with the 3 Different Versions.  I will release the Schematics when I put it on Kickstarter.

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davedarko wrote 04/04/2019 at 06:33 point

Wow, now that's a breadboard PSU :) looking forward to see updates!

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