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Breadboard Power Supply — Parallax Forums

Breadboard Power Supply

microcontrollerusermicrocontrolleruser Posts: 1,194
edited 2017-01-17 16:59 in BASIC Stamp
Developers

What's a good one?

https://cdn.solarbotics.com/products/documentation/stamp stack 2p v2.3.pdf

This board has a SERIOUS power supply on it.

Probably best to just build one like that on it's own little breadboard.

Another idea. We could start out with a simple one and just be careful with it.

Anybody have schematic for good simple power supply?

Thanks!

Comments

  • microcontrollerusermicrocontrolleruser Posts: 1,194
    edited 2017-01-17 18:02
    Developers

    Can we build the power supply circuit from this?

    https://www.parallax.com/sites/default/files/downloads/27130-Super-Carrier-Board-Schematic.pdf

    Put it on breadboard and PCB later?

    Okay. We'll build the one off of the PEkit.

    Thanks!
  • Mike GreenMike Green Posts: 23,101
    What do you want the power supply to do? Do you want just 5V output? Do you want 3.3V output too? How much current do you want to have available? What kind of input voltage do you want to handle? If you want to handle on the order of 1A to 3A output, you're probably going to need a heatsink unless you use a switching regulator. Most regulator ICs these days handle all the bullet proofing. You can certainly use Parallax's power supply circuits for examples. You can also use the sample circuits in most regulators' datasheets.
  • PublisonPublison Posts: 12,366
    microcontrolleruser wrote: »
    Developers

    What's a good one?

    https://cdn.solarbotics.com/products/documentation/stamp stack 2p v2.3.pdf

    This board has a SERIOUS power supply on it.

    Probably best to just build one like that on it's own little breadboard.

    Another idea. We could start out with a simple one and just be careful with it.

    Anybody have schematic for good simple power supply?

    Thanks!

    The power supply on that board only supplies 500ma, (read 1/2 amp). Not very much current for a breadboard project.

  • microcontrollerusermicrocontrolleruser Posts: 1,194
    Mike Green

    How about:

    Duplicate Stamp Homework Board and Stamp BOE?

    Publison

    The PEkit is a poor example, it's USB powered. Let's go with barrel jack type

    w/7.5v and 12v power supply.

    Thanks!
  • microcontrollerusermicrocontrolleruser Posts: 1,194
    edited 2017-01-17 22:14
    Mr Green

    Good idea.

    https://www.parallax.com/product/601-00506

    The LM2940CT-5.0 provides a fixed 5 V, 1 A supply for BASIC Stamp OEM and SX microcontrollers, or any 5V device in your breadboard or through-hole projects.

    This worked out!

    Thanks!
  • Duane DegnDuane Degn Posts: 10,588
    edited 2017-01-24 08:21
    Have you seen these sorts of power supplies?

    7097_5_7050.jpg

    Here's a different option.

    These are convent if you don't need a lot of current.

    These sorts of breadboard power supplies can be found a lot of places online. I think Banggood carries these and of course you can find these on ebay as well.
    microcontrolleruser wrote: »
    The LM2940CT-5.0 provides a fixed 5 V, 1 A supply for . . .
    . . .
    This worked out!

    Make sure you use the capacitors suggested in the datasheet.

    As Mike Green points out, if you're using a lot of current, you'll want to use a heat sink with a linear regulator.

    There are lots of inexpensive switching regulators available. Xanadu recently documented some tests done with inexpensive LM2596 boards. LM2596 boards cost about a dollar each and these don't get as hot as linear regulators.

    The LM2596 is kind of an old regulator. I've been told there are lots of better options now a days but it's hard to beat the price of those LM2596 boards.

    Edit: Fixed broken image link.
    Edit: Changed image link to a local file.
  • microcontrollerusermicrocontrolleruser Posts: 1,194
    Developers

    Plan to build simplest one first.

    5v only, not dual voltage 3.3 and 5v like on PEKit.

    It will be on it's own 170 tiepoint breadboard so it can be redesigned.

    Thanks!
  • yetiyeti Posts: 818
    edited 2017-01-22 21:39
    I got some of this type and am not happy with them because they don't stick well in the breadboard if I accidentally touch the USB cable.

    This variant behaves better on my breadboards and is switchable between 5V and 3.3V independently on both rails.

    Well... and these Maybe-FTDI-FT232s (I dont care because I don't use Windows) are not a power supply but they pass through the 5V from USB to one of the contacts at the long PCB side. I added pins to the sides (meanwhile I removed the 6 pins from the short side). When 3.3V are needed I add a small AMS1117 module.
    20160728_001h-bb1200-q95.jpg
    1200 x 909 - 705K
    20160728_002h-bb1200-q95.jpg
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    1200 x 909 - 725K
  • Buck RogersBuck Rogers Posts: 2,187
    Duane Degn wrote: »
    Have you seen these sorts of power supplies?

    7097_5_7050.jpg

    Here's a different option.

    These are convent if you don't need a lot of current.

    These sorts of breadboard power supplies can be found a lot of places online. I think Banggood carries these and of course you can find these on ebay as well.
    microcontrolleruser wrote: »
    The LM2940CT-5.0 provides a fixed 5 V, 1 A supply for . . .
    . . .
    This worked out!

    Make sure you use the capacitors suggested in the datasheet.

    As Mike Green points out, if you're using a lot of current, you'll want to use a heat sink with a linear regulator.

    There are lots of inexpensive switching regulators available. Xanadu recently documented some tests done with inexpensive LM2596 boards. LM2596 boards cost about a dollar each and these don't get as hot as linear regulators.

    The LM2596 is kind of an old regulator. I've been told there are lots of better options now a days but it's hard to beat the price of those LM2596 boards.

    Edit: Fixed broken image link.

    Um Duane, it's still broken. This is the latest of Chrome.
  • Duane DegnDuane Degn Posts: 10,588
    Buck Rogers wrote: »
    Um Duane, it's still broken. This is the latest of Chrome.

    I'm guessing ICStation requires some sort of cookie to view the image.

    I see the image in both of our posts.

    Forum170124a.PNG

    I'll edit the post again and see if I can get the image to stick this time.
    Forum170124a.PNG
    645 x 598 - 489K
    7097_5_7050.jpg
    600 x 450 - 183K
  • microcontrollerusermicrocontrolleruser Posts: 1,194
    Duane

    I should have responded sooner.

    1 We're going to build power circuit only on a 170 tiepoint breadboard.

    Just so we can keep track of what's going on easily.

    2 Use 5v regulator and then see what else it needs.

    Point being Stamp will run on regulated 5v so just take care

    of that first.

    Thanks!
  • Buck RogersBuck Rogers Posts: 2,187
    edited 2017-01-25 04:40
    Duane Degn wrote: »
    Buck Rogers wrote: »
    Um Duane, it's still broken. This is the latest of Chrome.

    I'm guessing ICStation requires some sort of cookie to view the image.

    I see the image in both of our posts.

    Forum170124a.PNG

    I'll edit the post again and see if I can get the image to stick this time.

    That worked. I use a similar one on mine. And those RS seconds as LiPo packs to run mine. (Not the BS1.)

    Now why do you have an audience of robots from CA? They were supposed to be on a walking tour of Asia and Europe from the Bering Sea down....
  • microcontrollerusermicrocontrolleruser Posts: 1,194

    Developers

    Maybe I need to rename this post.

    How do we build a 5v power circuit?

    Have the 5v regulator part figured out and that's it so far.

    Thanks!
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