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Article #1842

Re: Do most servos input a "pulse width modulated" sig?

#1842
From: James A. Hart
Date: Thu, 21 Jan 1993 21:15
33 lines
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D2KAK@VM1.CC.UAKRON.EDU () writes:
: Almost all servos now on the market are three wire types using a
: positive and negative (+5volts & Ground) and signal wires.
: The servo will respond to a Positive on pulse between .9 and 1.9 msec
: in duration. The off time is usually not critical as long as its around
: 2.5 msec or so.   The signal will look something like this:
:      +5 Volt               ___         ___
:       0 Volt      ________|   |_______|   |_________
: I hope this
: I hope this diagram shows up all right!

I've used servos in non r/c applications, and have found that as long
as the pulse WIDTH is within reason, that you can set the frequency 
well above that of the normal recievers output.  It makes it easy to
eliminate that 'buzzing' low frequency oscillation you sometimes get.

: The servo will normally center at about 1.5 msec for Futaba and J.R.
: and 1.4 msec for older Kraft radios. (Kraft Sport Series centered at
: 1.9 msec).  How many of you remember Kraft radios?

I love my Kraft servos!  I think the centering adjustment in the hub is
a great idea.  Why don't others do this? 

:  
: Hope this helps.
: Kraig Krumm (AMA59622)
: The University of Akron
: Electronic Systems

--
Name:        Jim Hart    N6JSS
InterNet:    hart@donald.etdesg.TRW.COM 
                         I'd rather be (R/C) LANDSAILING!
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From: hart@cheshire (James A. Hart)
Subject: Re: Do most servos input a "pulse width modulated" sig?
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Date: Thu, 21 Jan 93 21:15:05 GMT
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