A rather noisy solenoid on the gas jets at the Royal Edinburgh Military Tattoo. Each torch has two gas levels, low and high, switched by a solenoid on each unit. They can occasionally get quite noisy, particularly when being cycled.
The alternative of DC solenoids or linear gas control has been considered.
The alternative of DC solenoids or linear gas control has been considered.
Should have sprayed it with WD40 🤣
why are they pulsing those torches?
Have you ever done a teardown and explanation on solenoids?
It sure does sound like an electric klaxon type of alarm. Note that this is in the UK so it's a deeper 50/100Hz as opposed to the USA 60/120Hz.