Hi guys,
I am building a little car kit for my iPhone. Right now, I'm working on the mic/input part of the circuit. I bought a euro store iphone handset to see what such a circuit would involve. Below is the circuit for the microphone part of that handset.
- The push button shorts out the circuit, which answers a call.
- I think the resistor / capacitor / diode are to filter any voltage spikes from the PB switch or possibly filter the A/C signal from the mic, but I'm unsure. ?
- The electret mic has a resistance of 2.2K ohms.
So, if I ignore the push button for answering the call (and just use the button on the phone to answer calls), can I just hook up an electret mic of similar impedance and I'm good to go? As in this:
I am building a little car kit for my iPhone. Right now, I'm working on the mic/input part of the circuit. I bought a euro store iphone handset to see what such a circuit would involve. Below is the circuit for the microphone part of that handset.
- The push button shorts out the circuit, which answers a call.
- I think the resistor / capacitor / diode are to filter any voltage spikes from the PB switch or possibly filter the A/C signal from the mic, but I'm unsure. ?
- The electret mic has a resistance of 2.2K ohms.
So, if I ignore the push button for answering the call (and just use the button on the phone to answer calls), can I just hook up an electret mic of similar impedance and I'm good to go? As in this:
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