So I came up with this wonderful stereo FM IC named BA1404. In its datasheet, one of its applications has been stated as wireless mic transmitter. Can anyone tell me how to use mic with it.

 

Starting with the datasheet always helps.
But our Chinese girl hasn't been around lately.

 

Starting with the datasheet always helps.
But our Chinese girl hasn't been around lately.

Try this:
http://bf256.electromania.ro/stuff/datasheet/BA1404.pdf

 

What I'm picking up off the datasheet is 600 ohms, 0.5 mv.
One standard for professional low impedance microphones is 600 ohms, but they usually produce a lot more than 0.5 mv.
I would start with a low impedance microphone and a 1K audio taper pot for a volume control.

 

What I'm picking up off the datasheet is 600 ohms, 0.5 mv.
One standard for professional low impedance microphones is 600 ohms, but they usually produce a lot more than 0.5 mv.
I would start with a low impedance microphone and a 1K audio taper pot for a volume control.

Where do I connect the mic?

 

Where do I connect the mic?

Datasheet page 4: Drawing at the top of the page, pins 1 and 18

 

Datasheet page 4: Drawing at the top of the page, pins 1 and 18

So what I should do is simply plug in the +ve and -ve terminals of mic to pins 1 and 18. Since I'm not very advanced at electronics, please send me the rough schematic or whole wiring.

Please be more specific.

 

Please help me with this!

 

Many years ago, built an FM transmitter kit that used this chip. Believe it was a Ramsey FM25. It is still being used as part of the PA system by my rocket club. Audio input level is 'line level', about 1 volt peak-peak. That gives good audio quality with no indication of overmodulation.

The newer Ramsey FM transmitter kits appear to use the BH1415 chip, and the data sheet on that one says -10 dBV (0.89 volts p-p). https://media.digikey.com/pdf/Data Sheets/Rohm PDFs/BH1415F.pdf

 

https://media.digikey.com/pdf/Data Sheets/Rohm PDFs/BH1415F.pdf

How is this supposed to help me add a mic to my FM transmitter?

 

It would mean that you would need to use an amplifier for the mic to bring the level up to about 1 volt peak to peak. Then you would feed that signal into the audio input pins (through the pre-emphesis network) of the BA1404.

 

It would mean that you would need to use an amplifier for the mic to bring the level up to about 1 volt peak to peak. Then you would feed that signal into the audio input pins (through the pre-emphesis network) of the BA1404.

ok..Since I recently packed my entire project. I don't think it will be possible to add this much components. Therefore I'm stopping Q&A on this post.

 

It would mean that you would need to use an amplifier for the mic to bring the level up to about 1 volt peak to peak. Then you would feed that signal into the audio input pins (through the pre-emphesis network) of the BA1404.

Please provide me with a circuit diagram for mic amplifier which converts its signals to 1volt. I couldn't find anything..