In an attempt to get more power from a standard Futaba servo, I made a
pulse train of 10ms period. The servo worked OK, and with a little more
torque (not double). I don`t know if you can do this with any kind of
servos... but I think that standard servos works on the same basis: wait a
starting pulse edge, internally generate a 1.5ms pulse, and finally do a
substraction between them. The result goes to the motor trough some power
electronics involving possibly a pulse-stretcher. I think that there is a
limit in the frequency of the incoming pulses due to this stretcher stage,
an the limit is in the point where the stretched pulses to the motor join
together.

In fact, I was trying to do a device to mix two standard RC channels (20ms
period) and get the two mixed outputs "turbo-charged" to 10ms... finally I
put the project apart due to some reasons, one of them being not to be sure
how to do this with a _say_ 16C73, with all his PWM generators, Caputre
modules, and running at 20MHz. ?Any help here?

Hope this helps.
-----Mensaje original-----
De:     Justin Grimm [SMTP:reaper@SOUTHWEST.COM.AU]
Enviado el:     lunes 4 de mayo de 1998 11:00
Para:   PICLIST@MITVMA.MIT.EDU
Asunto: driving servos

Hi all
When using PWM to drive servos (hs-300), I know you need a pulse width
of 1mS to 2mS, but do the pulses "have" to be 20mS apart or can the be
less,
say 1mS?
Thanks in advance.

Justin Grimm    reaper@southwest.com.au