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Spudtech ForumPotato Gun And Air Cannon Community Forum |
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Spudtech
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 Posted: Fri Nov 01, 2002 9:00 am |
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Originaly posted by Warn-A-Brotha,I HATE THE NEW FORUM!
im too scared to post,
its too ... open! i dunno .. i dont like it
its hard to follow, i get lost and its soo frustrating!?
i keep forgetting if blue or green means i visited it!?
:(
please some-how keep the old forum style :/
and set "NEW TOPICS" BOLD! so you can see what ppl are replying to
( sorry ... )
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Spudtech
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Posted: Sun Jul 06, 2003 1:00 am |
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Joined: Sun Feb 12, 2012 1:19 am
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Originaly posted by GalFisk,The charge from the piezo-electric device is several thousand volts. Are you going to use the spark (in an ignitor) aswell as using it to close a 12V circuit?
I would think you could use either a small transformer, maybe the ignition transformer from a camera flash, to transform down the voltage, or you could use a small resistor in series with the piezo/spark gap. Either way you'd want to use the resulting pulse to trigger a transistor.
A relay will not have fast enough reaction time, since the pulse from a piezoelectric device is very short, and you'd need to use a transistor to drive the relay anyway.
you need to know the polarity of the spark, since we're dealing with electronics. If you connect a neon indicator lamp to the device, the electrode connected to the negative terminal will light up orange when you press the trigger.
Coming to think of it, a couple of diodes would be the bet way to get the necessary voltage to trigger the transistor. Then you'd need to wire up something like this:
+-------> <---+--|>--|>---+-------------------------------------+----> to battery -
| Spark gap | diodes ^ |
| | |/ emitter |
-[ ] Trigger +---------| NPN transistor |
| | base | collector |
| _ ------------> to load and battery + |
| ^ diode |
+--------------+-------------------------------------------------+
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Spudtech
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Posted: Sun Jul 06, 2003 1:00 am |
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| Site Admin |
Joined: Sun Feb 12, 2012 1:19 am
Posts: 10742
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Originaly posted by GalFisk,The charge from the piezo-electric device is several thousand volts. Are you going to use the spark (in an ignitor) aswell as using it to close a 12V circuit?
I would think you could use either a small transformer, maybe the ignition transformer from a camera flash, to transform down the voltage, or you could use a small resistor in series with the piezo/spark gap. Either way you'd want to use the resulting pulse to trigger a transistor.
A relay will not have fast enough reaction time, since the pulse from a piezoelectric device is very short, and you'd need to use a transistor to drive the relay anyway.
you need to know the polarity of the spark, since we're dealing with electronics. If you connect a neon indicator lamp to the device, the electrode connected to the negative terminal will light up orange when you press the trigger.
Coming to think of it, a couple of diodes would be the bet way to get the necessary voltage to trigger the transistor. Then you'd need to wire up something like this:
+-------> <---+--|>--|>---+-------------------------------------+----> to battery -
| Spark gap | diodes ^ |
| | |/ emitter |
-[ ] Trigger +---------| NPN transistor |
| | base | collector |
| _ ------------> to load and battery + |
| ^ diode |
+--------------+-------------------------------------------------+
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Spudtech
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Posted: Sun Jul 06, 2003 1:00 am |
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| Site Admin |
Joined: Sun Feb 12, 2012 1:19 am
Posts: 10742
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Originaly posted by GalFisk,The charge from the piezo-electric device is several thousand volts. Are you going to use the spark (in an ignitor) aswell as using it to close a 12V circuit? I would think you could use either a small transformer, maybe the ignition transformer from a camera flash, to transform down the voltage, or you could use a small resistor in series with the piezo/spark gap. Either way you'd want to use the resulting pulse to trigger a transistor. A relay will not have fast enough reaction time, since the pulse from a piezoelectric device is very short, and you'd need to use a transistor to drive the relay anyway. you need to know the polarity of the spark, since we're dealing with electronics. If you connect a neon indicator lamp to the device, the electrode connected to the negative terminal will light up orange when you press the trigger. Coming to think of it, a couple of diodes would be the bet way to get the necessary voltage to trigger the transistor. Then you'd need to wire up something like this: <![CDATA[<br /><br /> +-------> <---+--|>--|>---+-------------------------------------+----> to battery -<br /> | Spark gap | diodes ^ |<br /> | | |/ emitter |<br />-[ ] Trigger +---------| NPN transistor |<br /> | | base | collector |<br /> | _ ------------> to load and battery + |<br /> | ^ diode |<br /> +--------------+-------------------------------------------------+<br /></plaintexte><br /><br /></div>
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<td class="gensmall" width="100%"><div style="float:left;"> <b>Post subject:</b> <a href="#p91">Disaster. another try:</a></div><div style="float:right;"> <a href="./viewtopic.php?p=91&sid=df18dc80f76fdb88fba3dfd026077d0b#p91"><img src="./styles/black_pearl/imageset/icon_post_target.gif" width="7" height="9" alt="Post" title="Post" /></a> <b>Posted:</b> Sun Jul 06, 2003 1:00 am </div></td>
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<div class="postbody"><strong>Originaly posted by GalFisk</strong>,</br>The charge from the piezo-electric device is several thousand volts. Are you going to use the spark (in an ignitor) aswell as using it to close a 12V circuit?<br />I would think you could use either a small transformer, maybe the ignition transformer from a camera flash, to transform down the voltage, or you could use a small resistor in series with the piezo/spark gap. Either way you'd want to use the resulting pulse to trigger a transistor.<br />A relay will not have fast enough reaction time, since the pulse from a piezoelectric device is very short, and you'd need to use a transistor to drive the relay anyway.<br />you need to know the polarity of the spark, since we're dealing with electronics. If you connect a neon indicator lamp to the device, the electrode connected to the negative terminal will light up orange when you press the trigger.<br />Coming to think of it, a couple of diodes would be the bet way to get the necessary voltage to trigger the transistor. Then you'd need to wire up something like this:<br /><code><br /><br /> +-------> <---+--|>--|>---+-------------------------------------+----> to battery -<br /> | Spark gap | diodes ^ |<br /> | | |/ emitter |<br />-[ ] Trigger +---------| NPN transistor |<br /> | | base | collector |<br /> | _ ------------> to load and battery + |<br /> | ^ diode |<br /> +--------------+-------------------------------------------------+<br /></code><br /><br /></div>
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<td class="gensmall" width="100%"><div style="float:left;"> <b>Post subject:</b> <a href="#p92">I think I've got it now:</a></div><div style="float:right;"> <a href="./viewtopic.php?p=92&sid=df18dc80f76fdb88fba3dfd026077d0b#p92"><img src="./styles/black_pearl/imageset/icon_post_target.gif" width="7" height="9" alt="Post" title="Post" /></a> <b>Posted:</b> Sun Jul 06, 2003 1:00 am </div></td>
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<div class="postbody"><strong>Originaly posted by GalFisk</strong>,</br>The charge from the piezo-electric device is several thousand volts. Are you going to use the spark (in an ignitor) aswell as using it to close a 12V circuit?<br />I would think you could use either a small transformer, maybe the ignition transformer from a camera flash, to transform down the voltage, or you could use a small resistor in series with the piezo/spark gap. Either way you'd want to use the resulting pulse to trigger a transistor.<br />A relay will not have fast enough reaction time, since the pulse from a piezoelectric device is very short, and you'd need to use a transistor to drive the relay anyway.<br />you need to know the polarity of the spark, since we're dealing with electronics. If you connect a neon indicator lamp to the device, the electrode connected to the negative terminal will light up orange when you press the trigger.<br />Coming to think of it, a couple of diodes would be the bet way to get the necessary voltage to trigger the transistor. Then you'd need to wire up something like this:<br /><plaintext> +-------> <---+--|>--|>---+-------------------------------------+----> to battery -</plaintext><br /><plaintext> | Spark gap | diodes ^ |</plaintext><br /><plaintext> | | |/ emitter |</plaintext><br /><plaintext>-[ ] Trigger +---------| NPN transistor |</plaintext><br /><plaintext> | | base | collector |</plaintext><br /><plaintext> | _ ------------> to load and battery + |</plaintext><br /><plaintext> | ^ diode |<plaintext><br /></plaintext> +--------------+-------------------------------------------------+</plaintext></div>
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<td class="gensmall" width="100%"><div style="float:left;"> <b>Post subject:</b> <a href="#p93">Right...</a></div><div style="float:right;"> <a href="./viewtopic.php?p=93&sid=df18dc80f76fdb88fba3dfd026077d0b#p93"><img src="./styles/black_pearl/imageset/icon_post_target.gif" width="7" height="9" alt="Post" title="Post" /></a> <b>Posted:</b> Sun Jul 06, 2003 1:00 am </div></td>
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<div class="postbody"><strong>Originaly posted by GalFisk</strong>,</br>The charge from the piezo-electric device is several thousand volts. Are you going to use the spark (in an ignitor) aswell as using it to close a 12V circuit?<br />I would think you could use either a small transformer, maybe the ignition transformer from a camera flash, to transform down the voltage, or you could use a small resistor in series with the piezo/spark gap. Either way you'd want to use the resulting pulse to trigger a transistor.<br />A relay will not have fast enough reaction time, since the pulse from a piezoelectric device is very short, and you'd need to use a transistor to drive the relay anyway.<br />you need to know the polarity of the spark, since we're dealing with electronics. If you connect a neon indicator lamp to the device, the electrode connected to the negative terminal will light up orange when you press the trigger.<br />Coming to think of it, a couple of diodes would be the bet way to get the necessary voltage to trigger the transistor. Then you'd need to wire up something like this:<br /><pre><br /> +-------> <---+--|>--|>---+-------------------------------------+----> to battery -<br /> | Spark gap | diodes ^ |<br /> | | |/ emitter |<br />-[ ] Trigger +---------| NPN transistor |<br /> | | base | collector |<br /> | _ ------------> to load and battery + |<br /> | ^ diode |<br /> +--------------+-------------------------------------------------+<br /></pre></div>
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