Mic preamp in an iPod touch dock connector


[Marian] sent in his sweet little Mic preamp that he built for his iPod touch. He built the circuit on the legs of a TLC272 OP-Amp with SMD components. The whole thing actually fits inside the cover of a standard iPod dock connector.
Bonus: [tnkgrl] added a USB bluetooth adapter to her eeePC after her circuit tracing efforts.

Comments

  1. frank says:

    What’s the point of this? I don’t have an ipod touch – is it anything different to the plug-in mics you could get for the older ipods?

  2. DarkAxi0m says:

    I don’t have a touch either, but sometimes you get better recordings when you have a preamp on the mic.

  3. kaelb says:

    this is the most simple, useful, and cool looking ipod accessory i have ever seen.

  4. threepointone says:

    surface mount the op-amp and it’ll fit easier than cake. If you’re up for some uber-miniaturization, pick out some of those TINY opamps maxim has (I think they’re on the scale of those SOT transistor packages). Since it’s only one channel, this makes it even easier–I’d imagine with some really tiny passives (0201/0402 anyone?). Of course, the soldering gets even more difficult. I’d imagine you could fit this whole thing under the microphone–maybe if you’re really, really, really up to the challenge you could fit the whole thing under the mic and encapsulate it with some epoxy for an ultra-miniature amplified mic.

  5. fartface says:

    you get FAR better recording with a battery box than with a preamp.

    Allowing that microphone to swing a full 9 volts instead of the paltry voltage a ipod gives it always sounds better.

    too bad the ipod wont record good. Gotta love my iriver that allows stereo 48khz at 384kbps mp3 recording with manual level control. Kicks the crud out of any ipod.

  6. marian says:

    >>> is it anything different to the plug-in mics you could get for the older ipods?

    The commercial mic plugs are “signed” and communicate with the iPod. in case they were not licensed to a given iPod generation, the iPod says “not supported”. however, this design is pure analog, and is compatible with all iPods with LineIn pins.

  7. T-Dog says:

    Its not to record crap its for Voip…u can use the i touch like the iphone thanks to him now, if u hav an i touch use sum voip software and ur making calls..pretty sweet gotta get the plans for that to do to mine.

  8. Tabansi says:

    Informated Article… Appreciated!

  9. Earl says:

    I got the $25 Walmart ipod iVoice to work with vnotes which means the touch will work with voip when it comes out 1-1-08. The mod to the unit is not too hard. U4 is a Max9812 like the one the mic project boys have been working on. The ‘secret’ is to remove R24 (a 0 ohm) resister near the very edge of the board. One side is connected to pin 1 of U4. That is the amp chip enable pin. The pin is low via other hardware on the board.
    Now wire from where the R24 U4 was to one side of the LED. That will put 3.3 VDC on pin 1 of U4 turning it ON ! Now the mic amp is on and working.
    The beauty of all this is the mic is available at Walmart for $25 and it has a line in plug to boot !
    I hope this helps further the voip project by making the mic available nearly everywhere.
    Earl
    http://macally.com
    It is the iVoice III

  10. Andrew Goldie says:

    Hi i am from the UK and the ipod touch is now in full swing over here. i would like to make some of these for the UK. where do I get the parts from?

  11. cool

  12. Björn Wahlsten says:

    I did it my way:

  13. zsolt12346 says:

    Where is the sim card dock??? It’s not phone!

  14. buxto says:

    It’s not a phone or iPhone..It’s a ipod for music..so ?
    Best regards..

  15. Chip Tuning says:

    Hi, I am from Hungary. I would like to buy ipod touch for myself. Where can I do that in the uk?

  16. jorge says:

    please my name is george now view conexion por ipot touch amicrofones please conexion jorge lima peru

  17. At last a blog with the information I needed thank you.

  18. jesse says:

    can i have the specs or components needed for this ipod touch hack? i’ up for the challenge of making one for my ipod… please send me the list of components on my mail thanks!

  19. jono says:

    Does anyone have info for this saved any where? coz the touchmod site seems to be down and i cant find any info anywhere.

  20. I had been informed about this from a friend (who pointed me here) so thanks for making it available.

  21. Very good tool,thanks!

  22. arak says:

    Anyone has schematic and components list for this great tool?

  23. DaffyDad says:

    I am looking for a circuit diagram for inputing sound through the dock port of an iPhone or iPod

  24. I can not wait until the ipad is out in britain, i’ve come across several reviews online coming from Us clients also it seems amazing. I’ve seen a few incredible add-ons ^ just about to happen also! ipad PWNS!

  25. Jerry says:

    Please can someone sendme information & details of the circuit, the link is dead.

    jzarga(at)hotm…com

    please I need do this harware to use with skype.

    thanks.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Follow

Get every new post delivered to your Inbox.

Join 96,369 other followers