Idea 1

Control:

For our first idea we decided to use a voltage source inverter using Mosfets to give our frequency

Voltage source inverter

I began modelling a simplified circuit on Livewire which is based on that from
http://escholarship.lib.okayama-u.ac.jp/electrical engineering/2

The idea for this was to feed into a third order resonance circuit then onto a step up transformer

A simple on/off switch would be used to power this part of the circuit.

Output:


For the control of the gas I decided to use a small canister of helium. These were found to be relatively cheap. Another option would be to use Nitrogen, another inert gas, however industry does not seem to produce them in such small canisters at the helium

The helium would be controlled by a solenoid, which acts in a normally closed state. This adds a safety aspect to the project, in the case that if power was cut from the device, the gas would cease to escape.
The solenoid would be controlled via a simple push to make switch from a separate 12 volt supply

N/C Solenoid with PTM switch