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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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