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4hv.org :: Forums :: High Voltage
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Weird Plasma Speaker Arcs-- HELP
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fatboyslim
Fri Apr 24 2009, 09:38AM Print
fatboyslim Registered Member #1779 Joined: Sat Oct 25 2008, 11:05AM
Location:
Posts: 32
 		Hi

I Have built plasmaman's plasma speaker and it was working fine. I had recently changed the TL494 IC chip and it contined to work fine. All of a sudden though the sparks started to become very noisy and flapping. it drowned out the sound of the music. no matter how close i bring the two wires together the spark buzzes. i cannot achieve a soundless spark. I tried adjusting the pots but to no prevail. Can somebody please help me.

This is what the spark looks like now http://www.youtube.com/watch?v=1Y5DZtMYyXw&feature=channel_page]

The schematic of the circuit is here http://www.instructables.com/files/deriv/FSN/TLXV/FMMD1ALS/FSNTLXVFMMD1ALS.MEDIUM.jpg]

Mind you this is what the sparks USED TO LOOK AND SOUND LIKE http://www.youtube.com/watch?v=fmYdjXcgBss&feature=channel_pagel]

HELP would be much appreciated

Thanks

Fatboyslim
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Dr. Dark Current
Fri Apr 24 2009, 09:45AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
 		I see you "changed" the electrodes, this can have an impact on the arc stability.

If changing the electrodes back does not help, I guess some component got damaged, try replacing the 494 chip.
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fatboyslim
Fri Apr 24 2009, 10:22AM
fatboyslim Registered Member #1779 Joined: Sat Oct 25 2008, 11:05AM
Location:
Posts: 32
 		It makes the same kind of sparks with the electrodes. If the chip was damaged then would it still work? i am running 14v through it from batteries. could the MOSFET be damaged?
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Dr. Dark Current
Fri Apr 24 2009, 11:50AM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
fatboyslim wrote ...

It makes the same kind of sparks with the electrodes. If the chip was damaged then would it still work? i am running 14v through it from batteries. could the MOSFET be damaged?

Yes, these chips often fail partially and only some functions become "degenerated".

Of course the MOSFET can be damaged.
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teslacoolguy
Fri Apr 24 2009, 02:11PM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
 		what frequency are you running it at? It could be that when you changed the tl494 chip the frequency got messed up. It should be running at around 100khz.
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Littlew
Fri Apr 24 2009, 04:14PM
Littlew Registered Member #1448 Joined: Sat Apr 19 2008, 01:16PM
Location: Russia/Moscow
Posts: 21
 		looks like something in schematic is dead( maybe tl494)
try to replace it with new tl494
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fatboyslim
Fri Apr 24 2009, 07:28PM
fatboyslim Registered Member #1779 Joined: Sat Oct 25 2008, 11:05AM
Location:
Posts: 32
 		OK thanks. Ill try replacing the part and tell you how it goes. are there anyother parts that have the possibilty it was damaged so i could replace it?
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Antonio
Fri Apr 24 2009, 09:12PM
Antonio Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
 		The schematic has something wrong. Pin 9 of the TL494 is the emitter of a driver transistor, that has the collector on pin 8. There is nothing in the schematic to discharge the gate of the MOSFET and turn it off. Add a resistor between pin 9 and ground. 1 kOhm is probably enough. And make it sure that the circuit is grounded.
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uzzors2k
Fri Apr 24 2009, 09:32PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		Pin 10 should also be shorted to pin 9 in order to parallel the internal drive transistors.
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