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Stream Operator
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 267
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Wed Feb 17, 2010 9:06 am Post subject:
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Les, I think you've lost it!
No seriously, will this produce enough current? _________________ Synth DIY since 1977! |
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Inventor
Stream Operator
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 267
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Posted: Wed Feb 17, 2010 11:59 am Post subject:
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Yes, Dan. Back when I was creating My Secret Weapon I took apart a stun gun and the models at that time used a simple audio transformer hooked up backwards. Now they are more specialized though. The transistor switches on strong and the diode protects it, so shouldn't be a problem. I'm going to order the parts soon.
Les _________________ "Let's make noise for peace." - Kijjaz |
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jeff-o
Joined: Jul 19, 2009 Posts: 97 Location: Ontario, Canada
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Posted: Wed Feb 17, 2010 2:18 pm Post subject:
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I've seen that circuit before, and built something similar, back in high school! This circuit does not create a continuous spark, just a high voltage at the output which can be used to shock your classmates.
Do a search on Instructables for this; I'm sure I read about one there. |
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RF
Joined: Mar 23, 2007 Posts: 1502 Location: Northern Minnesota, USA
Audio files: 28
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Posted: Wed Feb 17, 2010 3:33 pm Post subject:
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"Nastybox", as my electronics shop teacher called them....
We used to build them into nice pretty little boxes with metal sides insulated from each other...and a mercury switch inside. Pick it up... look at it, turn it to one side...ZAP!
Great entertainment for a passive aggressive nerd.
Les - your mind works in strange and wonderful ways....
bruce _________________ www.sdiy.org/rfeng
"I want to make these sounds that go wooo-wooo-ah-woo-woo.”
(Herb Deutsch to Bob Moog ~1963) |
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jeff-o
Joined: Jul 19, 2009 Posts: 97 Location: Ontario, Canada
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Posted: Wed Feb 17, 2010 3:44 pm Post subject:
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To go with the shocker, I built a few film canisters with capacitors inside, and two aluminum plates outside. You'd charge up the capacitor to 600V or so using the shocker, then toss the film canister to a friend. Of course the macho thing to do is to catch whatever is thrown to you, so when they caught this little gem they'd get a nice little jolt.
We'd also leave charged capacitors lying around the electronics shop for others to pick up.
Good times. |
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Inventor
Stream Operator
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 267
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Posted: Wed Feb 17, 2010 4:15 pm Post subject:
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Well this is a shocker! Haha, now that you mention it, it was five years ago but I vaguely recall now that the audio transformer was used to boost the 9V up to a higher source level for a second stage that made the shock. So... does anyone have a good schematic for somesuch thing?
Les _________________ "Let's make noise for peace." - Kijjaz |
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RF
Joined: Mar 23, 2007 Posts: 1502 Location: Northern Minnesota, USA
Audio files: 28
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Posted: Wed Feb 17, 2010 4:44 pm Post subject:
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This won't help you Les...
But for those playing along at home...
The simple, low tech way?
Put a small DC motor or a relay type buzzer in series with the battery and secondary of the transformer.
Whee!
bruce _________________ www.sdiy.org/rfeng
"I want to make these sounds that go wooo-wooo-ah-woo-woo.”
(Herb Deutsch to Bob Moog ~1963) |
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Inventor
Stream Operator
Joined: Oct 13, 2007 Posts: 6221 Location: near Austin, Tx, USA
Audio files: 267
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Posted: Wed Feb 17, 2010 9:44 pm Post subject:
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Well I looked up the breakdown voltage of air. it's 33kV/cm. If this circuit produces 4kV then it would spark around 0.1cm which is an awfully small spark!
Les _________________ "Let's make noise for peace." - Kijjaz |
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jeff-o
Joined: Jul 19, 2009 Posts: 97 Location: Ontario, Canada
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jksuperstar
Joined: Aug 20, 2004 Posts: 2503 Location: Denver
Audio files: 1
G2 patch files: 18
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Posted: Thu Feb 18, 2010 8:25 am Post subject:
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I've performed with a Midi controlled Tesla coil before. A friend built the coil -- a monster with a toroidal sphere for an output -- which put out 3' streamers. We just connected a relay to the main supply, and PWM'd the control. The coil, once 'charged', is very responsive to this toggling between on/off, and definitive pitches could be heard (it's there, but there's enough harmonics to make it sound like really nice noise, but no resonance in the system to bring forward the fundamentals).
You can find ready schematics for a tesla coil that is maybe 12" tall, and puts out a 1" spark or so: that's plenty of ZAP for sound output! There's some nice solid state controlled schematics to boot, rather than the usual mechanic spark-gap.
When in high school, I remember doing a plasma "speaker" - not just using air, but a more ioniz(able?) gas/dust mixture, and with that 22kV could maintain a 3" long plasma cloud. I can't remember what the gas nor the dust was, though |
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RF
Joined: Mar 23, 2007 Posts: 1502 Location: Northern Minnesota, USA
Audio files: 28
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Posted: Thu Feb 18, 2010 8:54 am Post subject:
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jksuperstar wrote: | a more ioniz(able?) gas/dust mixture |
Argon or Nitrogen? That's what they sometimes use in those "Plasma Balls"
bruce _________________ www.sdiy.org/rfeng
"I want to make these sounds that go wooo-wooo-ah-woo-woo.”
(Herb Deutsch to Bob Moog ~1963) |
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