I am designing a small timing circuit and need a power source of around 4 volts and producing around 15 to 20 mA for around 5 to 10 seconds.
I am thinking of using a simple generator (iron core, copper coil) and need to get an idea of how large this needs to be. Can anyone help me with some calculations that I can use to get an estimate on how many coils, size of magnet rotational speed required etc.
Thanks
Steve
I am thinking of using a simple generator (iron core, copper coil) and need to get an idea of how large this needs to be. Can anyone help me with some calculations that I can use to get an estimate on how many coils, size of magnet rotational speed required etc.
Thanks
Steve