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Atari Punk Console propblems

Discussion in 'General Electronics Discussion' started by fundash, Apr 18, 2011.

  1. fundash

    fundash

    8
    0
    Jul 16, 2010
    Hello everyone, I have built an atari punk console using this schematic:
    [​IMG]

    Unfortunately, it does not seem to be working at all. When turned on, you here an initial click and nothing else. There is one narrow spot where it generates white noise. here is the circuit board:

    [​IMG]
    [​IMG]
     
    Last edited: Apr 18, 2011
  2. shrtrnd

    shrtrnd

    3,665
    453
    Jan 15, 2010
    Double check all of your components, recheck all of your connections.
    Have you got the ground of your circuit to the ground of your output.
    How critical is the balancing of the 470K pots. Looks like one might be a linear taper, and the other one an audio taper.
    Even though you 'know' you wired this correctly, you're probably going to find your
    problem in your assembly of the circuit.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,174
    2,690
    Jan 21, 2010
    One very obvious problem is that you have not removed the strips between the pins of the IC. Thus pin 1 is connected to pin 14, 2 to 13, 3, to 12, etc., etc.

    There are also no other breaks in any of the strips, so you may have inadvertently connected other parts of your circuit.

    In addition you're using way too much solder, and you should try to fold the leads over less (not at all is best, but if you need to keep them in place just splay the leads a little).

    Check out this site. I still think he's using too much solder, but it's a lot better. Notice how he cuts the tracks.

    Here is a page that shows some bad soldering and some better soldering. Yours looks more like the former. Aim for the latter.

    There are many tutorials on the net, but the basic technique is to have a little solder on the tip of the iron (enough that it looks nice and shiny, but not dripping off). Hold the tip against both the lead and the pad for a second or two, then apply a small amount of solder to the wire and the pad, near where the tip is touching them (or to the point where it is touching them). You only need a very little, enough that the pad and the wire gets a nice even coating and the hole is obscured. The final joint should look more like a ski slope coming down from the wire to the board than a boulder on the board with the wire growing out of it.
     
  4. serious coinage

    serious coinage

    13
    0
    Mar 26, 2011
    Also, next time you build a circuit, it's often a good idea to test it on a solderless breadboard, so you can be sure that the circuit design works and none of your components are faulty before you solder it. It's much harder to look for problems and fix them on a soldered PCB than it is on a breadboard.

    edit: Also, when soldering ICs, it's often a good idea to use a DIP socket, because if you solder in the DIP socket and then plug in the IC, there's no chance of the IC being damaged by heat, and if the IC is faulty, you can just unplug it and drop a new one back in - no desoldering involved.
     
    Last edited: Apr 20, 2011
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