In SX Microcontrollers, SX/B Compiler and SX-Key Tool, ShadowsSoldier wrote:

Hi William, interestingly sparks have even been used in place of ultrasonic transducers to achieve much higher ultrasonic frequencies than typical 40-80KHz. That is, they have good transmission qualities. The fact that it still occured in your battery operated circuit supports this. Sounds like you have inadvertantly come across a great jamming tool. Good metal shielding should solve this as well as a bandpass filter if necessary.

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