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ok im looking to make this type of setup so that i can use its output pin to read via analog.

enter image description here

this is the mic i got and would like to make that 3rd pinout which as you can see it only has 2 and this is how it comes as a replacement

enter image description here

what kind of passive components if any do i need to make this happen ? or how would i solder this mic in a way that i can get power ground and signal/output ?

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  • \$\begingroup\$ Do you have access to schematics of the pcb shown in the first picture? Or do you have the actual pcb in hands? Does it have a part number or datasheet? \$\endgroup\$ – Vicente Cunha Feb 12 '16 at 17:45
  • \$\begingroup\$ The vendor product page of the top image describes which components are used. \$\endgroup\$ – jippie Feb 12 '16 at 17:54
  • \$\begingroup\$ @jippie this is one of the modules i order ebay.com/itm/… and i also order a sort of replacement mic like the one from the one found in this page (single button mic) but i dont need a pot i just need the signal wire so that i can read from it using the arduino analog read pin \$\endgroup\$ – Frank Feb 14 '16 at 4:37
  • \$\begingroup\$ @VicenteCunha sorry i dont if i did i think that would have been a better solution but i still be asking myself HOW to get that 3rd sig wire \$\endgroup\$ – Frank Feb 14 '16 at 4:40
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Usually, Electret microphones capsules needs a "pull-up" resistor, like this example taken from Wikipedia:

Electret microphone example

This should be very similar to the schematics of your board.

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  • \$\begingroup\$ is their a tutorial i can follow to solder this ? i have all the passive components but im not clear about the schematic because altho i can read it i cant be forsure and i actually ordered this one from ebay ebay.com/itm/… but as you noticed from the main question i also ordered the single Electret microphones capsules because i want to build my own setups BUT without the actual pot like in the one from the link and also without the pcb, im just going to hot glues it after soldering \$\endgroup\$ – Frank Feb 14 '16 at 3:38
  • \$\begingroup\$ You can read some tutorials on the internet. This one was the first on a Google search. \$\endgroup\$ – ricardomenzer Feb 19 '16 at 17:45
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That is an electret microphone. The basic connection is

schematic

simulate this circuit – Schematic created using CircuitLab

As it says, changing the resistor will change the gain, and you can use any (DC) voltage in the range 2.4 to 5 volts.

It's a very good idea to follow the cap with a high-impedance amplifer.

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  • \$\begingroup\$ so since you schematic looks just like Andy aka below i will just repeat what i told him, " i sorta understand the schematic but i dont quite follow so #1 is the mic right? and between 1 and the 1k resistor theirs a separate wire that goes to a 4.7 micro feraite capacitor ? which interns becomes that signal wire im looking for ?" \$\endgroup\$ – Frank Feb 14 '16 at 4:42
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The mic you have is here: -

enter image description here

You can see that one of the pins connects to the case - that is 0V or earth. The other pin is the output/bias point. Connect a resistor between 1k and 10k betweeen the bias point and a DC supply (say 5V). The other end of the DC supply (0V) connects to the case pin.

The output signal will appear on the bias point and you can feed this to a high impedance amplifier via a capacitor: -

enter image description here

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  • \$\begingroup\$ good looking out on that one, i did not even noticed or consider anything more then just those two soldering points. Ok so i hear your points and i sorta understand the schematic but i dont quite follow so #1 is the mic right? and between 1 and the 1k resistor theirs a separate wire that goes to a 4.7 micro feraite capacitor ? which interns becomes that signal wire im looking for ? \$\endgroup\$ – Frank Feb 14 '16 at 3:43
  • \$\begingroup\$ Pin 1 is the microphones solder connecter that also connects to the mic chassis (as shown in the picture I modified). Pin 2 is what I called the output/bias point and that connects to a 1 k resistor that you have to supply. The other end of the 1k resistor connects to a supply voltage of about 5V. You then connect a capacitor also to pin 2 and take your output from the capacitor and pin 1 - this goes to your amplifier. \$\endgroup\$ – Andy aka Feb 14 '16 at 9:58
  • \$\begingroup\$ ok so between 1 and the 1k resistor im going to form something like a voltage divider ? but rather then use 2 resistor im using a resistor and a capacitor and from that cap im then going to solder a wire which will become my signal wire or bias as you call it ? also when you say amplifier what do you mean < ? the signal wire im looking to make will and should be going to my arduino analog pin so that i can read the audio/data \$\endgroup\$ – Frank Feb 15 '16 at 1:25
  • \$\begingroup\$ The internal circuit in the electret forms a voltage divider with the 1k. The capacitor is nothing to do with the voltage divider. The capacitor prevents DC flowing to the amplifier (or whatever). \$\endgroup\$ – Andy aka Feb 15 '16 at 10:50
  • \$\begingroup\$ you keep saying amplifier can you tell me what is it that your calling the amplifier ? \$\endgroup\$ – Frank Feb 17 '16 at 22:34

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