Here is the previous post in case people missed it - 555 Flyback Driver and Plasma Speaker Part I
I'm missing a couple of key components so I haven't been able to fully test the circuit. Here are some photos of the PCB being constructed:
|The design transferred to the copper clad board|
|The etched PCB before removing the toner ink|
The next part to be getting on with whilst waiting for parts is to design an enclosure for the high voltage part. I don't want anyone to be able to touch the arc but I also want to try to cause the sound to resonate so it can be heard. I'm basically going to design a speaker enclosure without a paper speaker cone.
I could design and print an enclosure using a 3D printer but I prefer to laser cut enclosures because it's quicker and I personally really like the wood finish. Don't worry only the high voltage arc will not be exposed to the wood - that would be bad and would cause charring and fire!
I sketched up a quick idea on a piece of paper which purely shows the kind of thing I'm looking for.
|Simple enclosure Idea for Plasma Speaker|
From there I went to Inkscape and using the tabbed box maker extension I created a 72 x 72 x 72 mm square box. My plan is mount the HV probes in the box with a mirrored acrylic behind the probes to maximise the arc from a purely aesthetic view point with a wooden case all made with on a laser cutter and glued together. From Inkscape I exported the files in DXF format into solidworks so that I can render them in 3D and so that I can add holes and other features. I prefer to work in solidworks when designing enclosures.
Here is what I came up with eventually. I also designed some holders for the HV probes which I'm going to 3D print. I'm hoping everything will work out ok!
|Plasma Speaker Assembly - ISO view|
|Plasma Speaker Assembly Front View|
|HV Probe Holder|
|HV Probe Holder - Side View|
|HV Probe Holder - Top View|
That's all for now - Langster