Coupling Capacitors: Necessity for Signal Injection

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LeeSin93
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Is adding a coupling capacitor to the generator necessary when injecting a signal for troubleshooting.
 
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Welcome to PF;
It is usually a good idea - yep.
 
Can you elaborate?
 
What is the role of a coupling capacitor?
How does it's presence or absence affect the signal response?
 
What is the role of a coupling capacitor?
How does it's presence or absence affect the signal response?