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  1. #1
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    A3977 Board buy if interested

    I've verified that the 2nd version of this board is up and running. (although there is one resistor that needs to be left off) I'm not intereseted in making a profit, just helping some DIY'ers. I've asked for a quote on buying additional blank boards. These are double sided, plated through hole, silk screen with solder mask boards. Warning (chair) It does take good soldering skills, a fine soldering iron, and good eyesite to solder the 44 pin surface mount part. Pics here, but the blank board picture doesn't do the silkscreen justice.

    http://webpages.charter.net/pminmo/3977.jpg
    http://webpages.charter.net/pminmo/proto3977.jpg

    I suspect the cost to be $8 or a little under per board. i.e. $24 or less for 3 plus postage. If there is any interest send me a private message, or an email via the zone. I don't think I want to hassle with mailing outside of the US, as I have not done it before.

    Phil
    Attached Thumbnails Attached Thumbnails proto3977.jpg   3977.jpg  

  2. #2
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    Quote Originally Posted by pminmo
    I've verified that the 2nd version of this board is up and running. (although there is one resistor that needs to be left off)
    Phil
    Is the '2nd version schematic' different than the version you have on your website or are you just refering to a different copper scheme? Also which resistor are you refering too?

    Thanks.

    Chris

  3. #3
    Moderator ynneb's Avatar
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    Yep Phil put me down for 3. Making the board was my biggest hinderance in trying out your work. I will PM you my details.

    Thanks mate, your continued work is greatly appreciated, and highly noticed in this forum.
    Being outside the square !!!

  4. #4
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    OCNC (Chris)
    Same version, R5 is wired wrong. It's not really necessary as all it does is hold the DIR line high if nothing is connected. But the line that is wired to r1 and c17 should have gone to JP1 pin 3 directly. Rather than fix it, its just as good to leave it off, nbd.

    Phil

  5. #5
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    Quote Originally Posted by pminmo
    OCNC (Chris)
    But the line that is wired to r1 and c17 should have gone to JP1 pin 3 directly. Rather than fix it, its just as good to leave it off, nbd.

    Phil
    I follow you regarding R5 but it looks to me like what you're calling R1 and C17 is actually R18 and C17. The line that's wired to R18 and C17 is coming from pin 1 of the 40106N. Is this the line that you're saying should go directly to pin 3 on JP-1? Is this also nbd or did you re-route it in 'Version 2' of your board?

    Chris

  6. #6
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    Chris,
    Your correct, it is R18 and c17. I misread my own schematic. Basically the intent was an rc filter made up of 10K and 470pf, with a 10K pullup. If you were to delete the connection of r5 ot r18,c17, and move that r5 connection to to JP1 pin 3 was my original intent. Like I said it's nbd with it out.

    Phil

  7. #7
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    Unfortunately due to a number of reasons I'm withdrawing my offer to make a batch buy. Fundamentally it just got unmanagable.

    Sorry,
    Phil

  8. #8
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    Driver Board Needed

    How to I know what driver board to use with my motors? Ideally I would like a driver board kit that can be assembled but which should I choose to go with my motors? The motor specs are StepSyn 103h7123-1742, DC 4A and I'm not sure of the volts.
    Any adivce is appreciated.

  9. #9
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    Suggest you do a google search on StepSyn and get all the motor data. unipolar, bipolar, coil current, coil voltage.....
    Phil

  10. #10
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    Quote Originally Posted by pminmo
    Unfortunately due to a number of reasons I'm withdrawing my offer to make a batch buy. Fundamentally it just got unmanagable.

    Sorry,
    Phil

    wow bummer... was looking forward to them

  11. #11
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    Does anyone know where to get a board for the A3977? I am trying to get into the CNC hobby with out going for broke. Would using the A3977 be the most economical way to drive bipolar motors?

    Kevin

  12. #12
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    Any1 has any power supply unit contruction diagram that cater the sufficient voltage/current for A3977 driver circuit? (all the 3 axis)

    I am abit confused when searching thru the posts for building a PSU, terms like toroidal transformer and even some1 talked about PC AT power supply put in Series and things like that. But i couldnt find a well complete circuit for our lil need....

    I m looking at 2.5A @ 30V or less for driving my PK268... is my math correct here:
    Bipolar Series - 1 motor -> 5.0A and "real" amperage is 1/3 of it, which is around 1.67A
    Then, all the 3 motors totaled up about 5.0A current needed!??

    THanks!

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