I have a perenial problem I am sure someone will be able to help with. A lot of my student's gcse projects (I am a technology teacher) use 555 monostables controlling cheap, noisy, (electrically) motors through a tip 121.This leads to interference with the time period, and if an astable is controlled by the mono as well, the astable becomes totally useless. I have tried all sorts of capacitors in all sorts of places in the circuit to try to alleviate the problem but nothing does it completely. There must be a PROPER way to sort this out without having to resort to more expensive motors. Any help gratefully received
Thanks
Tony at Rawmarsh
Thanks
Tony at Rawmarsh