DIY plasma speaker

Hardware components: 6P42S OP PL504 Vacuum Tube BU208 transistor BU869 transistor Resistors, capacitors, ciols Schematic: Plasma speaker: power supply: Audio Isolation: working principle: It has a modulated RF power amplifier for controlled ion discharge. By modulating the oscillator with an audio signal, the flame size has changed, and the air pressure also changes. Details: Wrap the diameter of 2.80 m lacquer copper wire in a coil rack in diameter 18 mm The normal working CIOL is formed by 15-pin insulated copper wires on a ceramic body having a diameter of about 35 mm. The vacuum tube uses the PL504 and 6п42с of mutual pin, and sets the bias current of the vacuum tube on the bu 508 base, thereby setting the flame size. BF869 is a high-frequency transistor that is a modulation amplifier, which uses this potentiometer to adjust the input signal, which is electrically insulated by two audio trafos. The entire device is also powered by 220V AC wire, but powered by a 220 / 220V isolation transformer with hundreds of watts. Equipment Disadvantages: High efficiency, no speaker accessories, no sound pressure exceeding 82-85 dB Note: The device operates at a high voltage and high power RF of 27 MHz. This may be harmful to health, it is recommended to use a metal chassis to shield because this is a strong transmitter, please pay attention to the plasma flame, the flame is very hot.

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