I have a microphone (some unknown electret in a Cobra handheld mic) that is connected to a 1/8 mono jack like this:
+---------------------------------------- tip +5V from CB/FRS
ECM | R1 .66K | C1 103
| |
----------------------------------------- shield
The resistor and capacitor are in parallel. I want to replace the ECM with a noise-cancelling ECM. Is this just a matter of soldering the n/c ECM in place of the old ECM? Are any changes to R1 and C1 required? How about a really basic question: what is the practical effect of R1 and C1 in parallel? I can find explanations about what it does to voltage/capacitance/impedance from a mathematical standpoint, but what does it really do in a practical application? In other words, why can't you just connect the microphone without the resistor and capacitor?
+---------------------------------------- tip +5V from CB/FRS
ECM | R1 .66K | C1 103
| |
----------------------------------------- shield
The resistor and capacitor are in parallel. I want to replace the ECM with a noise-cancelling ECM. Is this just a matter of soldering the n/c ECM in place of the old ECM? Are any changes to R1 and C1 required? How about a really basic question: what is the practical effect of R1 and C1 in parallel? I can find explanations about what it does to voltage/capacitance/impedance from a mathematical standpoint, but what does it really do in a practical application? In other words, why can't you just connect the microphone without the resistor and capacitor?