I tried to build solenoid engine. It works with 24volt. Contact points generate sparks during the engine operation. What can I do to get rid of sparks? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_pFbE6rsChg.html Please check out working video of my build.
Speed variation I presume is by altering the micro-switch position and thus its throw, but what makes the sound? Is it purely the mechanical sound of the switch amplified by the wooden base? Phil