Solenoid Striker

Discussion in 'The Projects Forum' started by itwilson, Nov 11, 2011.

  1. itwilson

    Thread Starter New Member

    Nov 11, 2011
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    Hello All,

    Love what I have seen on the forum so far.

    Couldn't find quite what I am looking for so hopefully I can get some help.

    I am building a simple system that uses a pull type solenoid to strike a material (wood, plastic, metal, etc.) then I am recording those sounds. I would like to use a momentary switch to trigger the solenoid, so what I need is to know how to power the solenoid and what I need to wire them all together.

    I have seen a few videos on how to make electronic instruments and such, but they all seem to want to use Mosfett's and since this is a one shot deal I think that is way too complicated.

    As for parts the solenoid that looks to be right for the job is:
    http://www.allelectronics.com/?page=review&id=SOL-58

    I think for the momentary switch:
    http://www.allelectronics.com/make-a-store/item/PB-177/SPST-ON/OFF-PUSHBUTTON/1.html

    If those are bad, let me know, but I also need to find a power supply, do I need resistors and capacitors? I am pretty new to this realm (a musician and a designer) and would take the time to study up if it were not for the fact that this is for a research project for my university and needs to be done quickly.

    Thank you so much for your advice in advance!

    Humbly yours,
    Ian
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Parts looks good.
    But are u sure the solenoid has enuf power to produce the sound you will need .

    I guess you have to find out, HUH!

    So now you will need an Adapter.
    A wall wart as you guys might call it.

    I believe a 24VDC one will give you enuf pulling power. The lower the voltage the lower the pulling power will be.
    But at the rated spec I believe an Adapter will be expensive. The solenoid will draw around 5 to 7 amps of current, which is by the way quite big. Around 168W.

    I think a 12V lead acid battery rated at 7AH will be best for u.

    How about a 12V solenoid powered with the battery..This option is better and safer
     
    Last edited: Nov 11, 2011
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    The switch that you are considering is not adequate.

    From the specs on the page:
    So, if you are going to use 24v with it, 24 Volts/3.3 Ohms = 7.27 Amperes; and the switch is only rated for 3 Amperes. You would weld the contacts together.

    You need a very quiet switch, or you will pick up the sound when you are sampling the noise made. The solenoid is going to be problematic as well. I imagine that the spring will also make a sound when the solenoid strikes something. There will also be the metal-against-metal clack when the core hits something.

    I'm not sure how you're going to handle all of those problems. Have you considered them?

    Have you sampled sounds before?

    If you try to "stretch" a sample too much, it'll sound either very "thin" or muddled, depending on which way you've gone. I had an old Roland U-20; it stretched a sample over about 8 or 9 half-tones; around 12 or 13 samples for 8 octaves.
     
  4. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,176
    397
    With a pull type solenoid, the thump comes from the return spring. Could add a stiffer spring if needed. ' would use capacitor discharge- 24V or higher V wallwart @ 100mA, or 3ea 9V batteries +_, 470 +_ Ω charging resistor, 10,000 μF @ 35 to 50V. Amount of C depends on spring strength & battery. I think a push type might be better.
     
  5. itwilson

    Thread Starter New Member

    Nov 11, 2011
    2
    0
    Thank you all for your replies so far. Yes I have sampled sound before. As far as spring noise and such, I have built a sound reduction chamber (no such thing as sound proof). The solenoid will be in a separate chamber and will move a acrylic rod used as a lever. The rod is what connects the two boxes. I think pull is best for this situation because I need it to return (not have multiple strikes).

    As far as sampling goes, I am looking into the sound characteristics of materials, not really sound design so I wont need to stretch or anything.

    I would like to be able to strike with multiple different forces, but for now, I just need a consistent way to hit stuff. I think the site says its only about 3 pounds @ 24 vdc, which isent a lot. I know a push type can probably do more, but I need it to return. I am completely open to suggestions. Main goal, not to kill myself in the process. Thanks for identifying the need for a stronger switch. This is why I have you guys :).

    Not really sure what my budget is, but its on the universities dime so under 100 for sure....
     
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Put solenoid in find box, upper right top of page, scrool down to I made a solenoid- it's yours for postage.; or just wire.
     
  7. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    A rotary solenoid also works well, used one to beat a drum @ 10 beats per sec- also cap discharge.
     
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