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No offence ... BUT
http://forum.spudtech.com/viewtopic.php?f=45&t=28
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Author:  Spudtech [ Fri Nov 01, 2002 9:00 am ]
Post subject:  No offence ... BUT

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 ... )

Author:  Spudtech [ Sun Jul 06, 2003 1:00 am ]
Post subject:  Test, don't look

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 |
+--------------+-------------------------------------------------+


Author:  Spudtech [ Sun Jul 06, 2003 1:00 am ]
Post subject:  Nope. Another test

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 |
+--------------+-------------------------------------------------+


Author:  Spudtech [ Sun Jul 06, 2003 1:00 am ]
Post subject:  Nope. Again:

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:
<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 /> </td> </tr> </table> <hr width="85%" /> <table width="85%" cellspacing="3" cellpadding="0" border="0" align="center"> <tr> <td width="10%" nowrap="nowrap">Author:&nbsp;</td> <td><b>Spudtech</b> [ Sun Jul 06, 2003 1:00 am ]</td> </tr> <tr> <td width="10%" nowrap="nowrap">Post subject:&nbsp;</td> <td><b>Disaster. another try:</b></td> </tr> <tr> <td colspan="2"><hr class="sep" /><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 /> </td> </tr> </table> <hr width="85%" /> <table width="85%" cellspacing="3" cellpadding="0" border="0" align="center"> <tr> <td width="10%" nowrap="nowrap">Author:&nbsp;</td> <td><b>Spudtech</b> [ Sun Jul 06, 2003 1:00 am ]</td> </tr> <tr> <td width="10%" nowrap="nowrap">Post subject:&nbsp;</td> <td><b>I think I've got it now:</b></td> </tr> <tr> <td colspan="2"><hr class="sep" /><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> </td> </tr> </table> <hr width="85%" /> <table width="85%" cellspacing="3" cellpadding="0" border="0" align="center"> <tr> <td width="10%" nowrap="nowrap">Author:&nbsp;</td> <td><b>Spudtech</b> [ Sun Jul 06, 2003 1:00 am ]</td> </tr> <tr> <td width="10%" nowrap="nowrap">Post subject:&nbsp;</td> <td><b>Right...</b></td> </tr> <tr> <td colspan="2"><hr class="sep" /><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> </td> </tr> </table> <hr width="85%" /> <table width="85%" cellspacing="3" cellpadding="0" border="0" align="center"> <tr> <td><span class="gensmall">Page <strong>1</strong> of <strong>1</strong></span></td> <td align="right"><span class="gensmall">All times are UTC - 6 hours </span></td> </tr> <tr><td colspan="2" align="center"><span class="gensmall">Powered by phpBB&reg; Forum Software &copy; phpBB Group<br />http://www.phpbb.com/</span></td></tr> </table> </body> </html>