This means that the current to the external circuit is always in the same direction ... increasing the number of turns on the coil The diagram shows four different positions of the coil in ...

I have wanted to make a pulse generator for years ... inputs not shown in the diagram, would probably allow dc offset, gain control and slew control to be added to get a similar effect from a fixed 5V ...

This is a simple home telephone ringtone generator circuit which is built with applying only several electronic components / parts. It generates simulated telephone ringtone and requires only DC ...