Instructables

Flyback plasma speaker with 555

so i thought i would set out to make a plasma speaker! SO one chip i know well is a LM555 so this is my base! one pin most often skiped on this chip is pin5 it s the voltage control oscillator. all that is needed is an audio signal to this pin to get pwm



                                  This Is A High Voltage Project
                                        YOU HAVE BIN WARNED




                            CLICK HERE IF YOU CANT BOIL AN EGG


                                           http://disney.go.com


 
Remove these adsRemove these ads by Signing Up

Step 1: Parts list

Picture of parts list
99% of the parts can be obtained from http://www.allelectronics.com/

1   3.5MM MONO OPEN AUDIO PHONE JACK

1   SPDT ON-ON MINI TOGGLE SWITCH

2   9V BATTERY SNAP, I-TYPE

1   Heatsink

1   Lm555

1  8pin socket for the 555

2   20k pots

1   10k trim pot

1   100ohm pot

2 1n4148 diode

2   1k 1/2 watt risistor

1   ADJ. POS. REG.

1   2n3055

1   .001uf cap

1   .03uf cap

1   Gi2404 diode


othere parts needed 

2   9v batteries

1   16v 3 amp DC power supply

1   FLYBACK TRANSFORMER 

1   audio signal you may need some type of amplifier  if you use a          weak signal like a cell phone or weak mp3(im using an old              raidoshack amp)

Step 4: Find the flyback pin outs

Picture of find the flyback pin outs
this set shows you how to find you flybacks pin outs

http://lifters.online.fr/lifters/labhvps/tht.htm




Step 5: Last chance to rechk everything

ok so now that your allset start with the 0v and hv out about 1/4inch apart then slow move back till you get a longer soft spark if it go wild move it closer

Step 6: TIME FOR TUNES

plapić5 months ago
hey dude. so i got it all toghether but it doesn't work for me. there is no arc or anything. the trani is heating big time. and i'm using a cell phone for an audio supply. any recomendations or solutions?
plapić6 months ago

Hey Glenn781 i have a new Q
The power source for the flyback is 16V and the diode starts to lead and give the output signal at 20V so how is that posible to work???
BTW in my country vishay who is the manufacturer of the Gi2404 isn't availble so i've found a replacement, the BYV42/200 and it might be even better for the role.

I must be finished by friday so i have 2 days and please be quick with the answer.

sorry for my bad english

plapić6 months ago

Hey Glenn781 could you please help me out.
I'm in the process of building this project and i couldn't get my hands on 2n3055 but i got a replacement the BDY90 and now i can't find the collector.
The datasheet says it is "tab" but i don't know what that should be. Could you help.

BTW i'm doing this as a school project and a fast reply would be very very apreciated.
Sincerily!

Glenn781 (author)  plapić6 months ago

the tab in the transistor case

Glenn781 (author)  Glenn7816 months ago

the tab is**

plapić Glenn7816 months ago

so any conection to the case is a conection to the collector?

Glenn781 (author)  plapić6 months ago

yes plz let me know if you have any problems i would be more then happy to hlp you out

I got it working on the computer power supply! It works pretty well on 12V without any major problems with heating unless I really crank it up. Just out of curiosity I also tried 5V but the arc is less than 1/8" and it's super quiet and that just doesn't quite cut it.

I'm not using the rectifier(GI2404) at all, initially I used a set of heavy high speed diodes but it's been running fine without them.

Typically I keep the arc as fine as possible, it's quieter when it's turned down but the audio quality is better and the arc is more stable/cooler so I don't have to "relight" it.

I didn't have any 20K pots on hand for the pulse width adjustment so I experimented with 10k and 50k. It seems to run better on the 50K pots. I'm going to try a pair of 10k pots in series in place of the 20k pot next.

Another pot I'm experimenting with is the 10k on the voltage adjustment. For the LM317 by replacing the 10k pot with a 3k resistor and a 7k pot, I limit my voltage to a range of 5V-13.75V, keeping me in a safe range for the 555.

Thanks for all the help! I assembled my circuit (with a few minor modifications) according to your diagram and it worked right the first try. A little fine tuning and it was audible from across the basement workshop.
Glenn781 (author) 1 year ago
hi seabeepirate as for your LM317 it will work gr8 but if you put the driver on the same power supply as the coil i would use the : Voltage Regulator with Protection Diodes how to hook that up should be in the datasheet

a 12v comp power supply is the way to go as for the noise using : Voltage Regulator with Protection Diodes and some filter caps around that should cut this down if there is any at all. now for the max input of the 555 you never wannt run a chip at the max anything once you reach the max the chip will get hot and the burn!!!!

NTE6240 looks good

brushless computer fans have little to no noise you are gonna need on hell of a heat sink mine is sitting on a peltier device http://en.wikipedia.org/wiki/Thermoelectric_cooling

the 555 is just an oscillator each pot just sets how long its on and off one pot set the high time the othere sets the low time if you need more info on the 555 i got a killer PDF on 555's and lots of there chips i can email you

if you have anymore questions please hit me up i wanna see your finshed build
and if you need more infor on the 555 i can help with that too


That all sounds good. Should I use the comp power supply for the flyback driver also or should I stick to the 19V power supply for the flyback? I would imagine running the flyback on the lower voltage will help keep the transistor temp down, but my concern is that I won't get a good arc.
Glenn781 (author)  seabeepirate1 year ago
its only 7v less and it will help keep the tranny cooler
Awesome project, I'm actually using your design for a class project this semester (Most of the other guys are using kits from Radio Shack that blink LEDs but that was a little on the boring side for me) I'm gathering the parts to build it now, but I have a few questions.

Does it matter if you use linear or log/audio pots?

Does the LM317 look OK for the voltage regulator? http://www.datasheetcatalog.org/datasheet/stmicroelectronics/2154.pdf

Can I replace the 9V batteries with a 12V computer power supply and will the power supply add noise to the audio? I want to make it a more permanent rig. I understand the 12V power supply doesn't reach the max input for the 555, but do I want it to be able to?

If I've read the datasheet for the 2n3055 correctly, my 19.5V/6.7A power supply will be OK to power the flyback. Does this sound reasonable? Here's the datasheet:
http://www.st.com/web/en/resource/technical/document/datasheet/CD00000895.pdf

Could I run both the timer and the flyback on the same supply? Say,  using 7812 or 7815 to drop the 19.5V to a safe 12V-15V, or is the variable voltage supply crucial? Maybe use a 7815 to give me a safe 15V and and then the LM317 to adjust the level?

I'm having trouble locating the GI2404 locally, is the NTE6240 OK? I think I read that they're equivalent and the figures look the same, but I'd like a second opinion if you don't mind. Here's datasheets for both:
http://www.vishay.com/docs/88624/88624.pdf     -GI2404
http://www.datasheetcatalog.org/datasheet/nte/NTE6240.pdf   -NTE6240

If I run a fan mounted to the back side of the heat-sink will it add noise to the audio? My thinking is that I could run a CPU cooler(if the computer power supply is ok) as my heat sink since I have half a dozen extras sitting in my junk parts pile. My junk pile is where I get a lot of things like heat sinks, power supplies, and sometimes hard to find parts.

I really like your Instructable. My only suggestions are to explain a little bit about how you use the 555 to produce PWM, what the individual pots do, maybe add a section on how you built your enclosure(not really important I guess), and maybe add more pictures. I'm very partial to lots of pictures.

I have to stop now, the more I think about it the more questions I have. Any help is much appreciated, if I get it working maybe I'll make an Instructable of my own.
Glenn781 (author)  seabeepirate1 year ago
oh as for linear vs audio pots you can use both but the audio pots will be touchy on the highend
Glenn781 (author)  seabeepirate1 year ago
hope this helps
Morgantao1 year ago
This is looking sweet.
I have to ask, you didn't wind any additional wires around the FBT core as I have seen in other instructables. Those are just for longer arcs, right? Or do they serve any other purpose?
Thanks for a great 'ible. Now that I got my hands on 2 FBT's I'm gonna try this one out :-)
Glenn781 (author)  Morgantao1 year ago
To be honest I have never had to much luck with winding my own primary.i always seem to burn up a tran or something. this is one of the reasons I made this
Gotcha. I suppose since I have 2 FBTs I'll use the one I know that works with your schematics.
The other one I don't know if it's any good, so I'll try winding some wire on it and hope it doesn't catch fire :)
Glenn781 (author)  Morgantao1 year ago
Plz let me know how it works out for you
mpep2 years ago
Well done on getting this working.
A question though, what is D5 there for?
Also, do you need to take into account that most LOPTs these days have a rectifier in its output? Will it work regardless?
Glenn781 (author)  mpep2 years ago
I was haveing major heating so I popped d5 in there and it droped the some of the heat it may not be needed but every bit helps. As for the built in rectifer its on the output you wanna stop emf spikes from passing to the input coil witch will heat up your transistor. Let me know how it turns out!!! If you have any problems let me know im here to help!
Electorials2 years ago
Disney!
oh god no
akinich3 years ago
hey nice instructable
can i have a proper type of circuit diagram please
i cant understnd this !
thanks
akinich
Glenn781 (author)  akinich3 years ago
Tish is a proper ciruit diagram if you click the I on the upper left if the ciruit it will let you see the full size image thanx for your commet if you need any more help plz let me know
i know tht but i kinda want a simpler one like n revheads instructablle the laser securtiy thing
if its possible please ????
thanks
akinich
Glenn781 (author)  akinich3 years ago
Im sorry if you cant understand this ciruit plz do not attempt to make it I dont want you getting hurt!!!!
dcpppf3 years ago
Love the fact that this uses a 555, very cheap. Would like to see more discussion on you schematic though if that is possible. Maybe upload a more clear image.
adam 101 dcpppf3 years ago
click on the "i" in the corner then click on see original image. Instructables over compressed a very clear image.
danymw3 years ago
Can you replace all by a broken plasma globe?
Glenn781 (author)  danymw3 years ago
not shure you should try
joemilliken3 years ago
Good job, seems very simple compared to others I've seen.