ROHM BA1404 FM Stereo Transmitter IC Chip

The ROHM BA1404 DIP-18 IC is a truly unique chip.  With this IC and a few external components, you can build your own stable FM stereo transmitter.  That means you can make your own wireless FM microphones, pirate radio station, and car stereo transmitter so you can play your MP3/iPod/iPhone music through your car stereo with clarity.  The great thing is this chip operates on a single 1.5 AA battery and features low power consumption.  If you don’t have one yet, you can get yours in our store at http://mklec.com/ba1404-fm-stereo-transmitter-ic

Getting Started

There’s a few crucial external components you will need to build this circuit.  I’m going to be using the circuit found at http://www.electroschematics.com/54/ba1404-fm-stereo-transmitter/.  I’ll make a complete parts list soon, but the main things outside the standard components is the 38KHz oscillator crystal and the 3.5 turns RF coil.

Share Yours

We’d love to hear from you on your experiences with this IC and even show off your build.  Please feel free to post a comment below and/or visit our Google+ Community and share there.

Laser Communicator WITHOUT Audio Output Transformer

If you’ve searched around for “How to build a laser communicator“, you probably stumbled across several examples that use the RadioShack Audio Output Transformer, Catalog #: 273-1380.  I’ve built one and it works great, but it’s roughly $3 just for the transformer and finding these things elsewhere is nearly impossible.  They also add unnecessary bulk to the transmitter and we can build it using much cheaper components!
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