It’s an excellent way to learn about both PWM motor control and the use of 555 timers, all with a very low parts cost and readily available components. We’ve seen such setups before, used as ...

This is a very simple touch sensor switch that is build with the 555 timer IC. You just need to touch the metal plate and the relay gets ... The relay is a 12 V DC relay operating at currents less ...

The linked 555 article makes sense if you read it, but a normal NPN circuit to drive the relay only takes 1mA… easy for most uC’s. Then it starts talking about active low input, and how CMOS ...