Harold Hallikainen wrote:
> I've wondered what the hardware in these servos really is. It SEEMS that
> maybe they run the PWM through a low pass filter to get an analog voltage
> that they then compare with a pot on the shaft and drive the motor with
> the difference. It SEEMS that the use of PWM is just a way to get analog
> voltages. I've never taken one of these servos apart, but one of my
> students brought one to class to play with. I found that just driving it
> with an analog voltage between the supply rails did NOT make set the motor
> position as I had expected. Maybe there's a schmitt trigger before the
> LPF?
>
> So, does anyone know what's actually in the servo motors?
>
> Harold
>
>   
The servo controller in the Hobbico C-61 is the NJM2611
http://semicon.njr.co.jp/njr/hp/fileDownloadMedia.do?_mediaId=417
Gaston


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