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[DPRG] Servo noise
Subject: [DPRG] Servo noise
From: DeltaGraph at aol.com
DeltaGraph at aol.com
Date: Sat Sep 23 18:13:11 CDT 2006
Triffid Hunter,
One suggestion:
If you can afford the small voltage drop across a diode, you could connect a
diode from Battery+ through to a large capacitor which is then fed to basic
stamp. When you turn on your servo circuit, presumably a switch connected to a
second large capacitor, the transient current flow into to this capacitor
will not directly drop the stamp's supply. A scope can come in handy here - or
of course you can take the circuit simulator route or of course there is the
number crunching route to get a nice mathematical model of what you are doing.
In theory, the servo filter capacitor looks like a dead short for a very
brief time -- don't think that actually happens, but with your stamp supply
capacitor isolated by a diode it will appear that the battery has been
disconnected for just a brief time versus the supply to your stamp shorted to ground --
if that makes sense.
Ron Grant
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