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Spudtech ForumPotato Gun And Air Cannon Community Forum |
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[ 7 posts ] |
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Spudtech
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Posted: Fri Nov 01, 2002 9:00 am |
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Joined: Sun Feb 12, 2012 1:19 am Posts: 10742
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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 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:
+-------> <---+--|>--|>---+-------------------------------------+----> 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:
+-------> <---+--|>--|>---+-------------------------------------+----> 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: +-------> <---+--|>--|>---+-------------------------------------+----> to battery - | Spark gap | diodes ^ | | | |/ emitter | -[ ] Trigger +---------| NPN transistor | | | base | collector | | _ ------------> to load and battery + | | ^ diode | +--------------+-------------------------------------------------+
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