Assembling a Niftymitter V0.24 Board - a Short Range FM Transmitter

Introduction: Assembling a Niftymitter V0.24 Board - a Short Range FM Transmitter

About: I am a freelance design engineer and drummer. My business site is at http://www.zero-waste.co.uk and is often concerned with appropriate technologies, open source design and design for sustainability.

This Instructable will guide you through assembling the circuit for Niftymitter, an open source mini FM transmitter. The circuit uses a free running oscillator and is based on Tetsuo Kogawa's Simplest FM transmitter.

The project is housed at www.openthing.org/products/niftymitter

Step 1: What You Need


Step 2: Solder on the Resistors and Capacitors

Place comonents flush up against the board from above. After soldering the legs onto the pads, trim of the excess.
Start by soldering all the resistors. Follow with all the capacitors and the jumper lead. Ensure that the electrolytic capacitor is oriented as described on the circuit layout diagram, the negative side away from the socket.

Step 3: Solder on the Socket, Coil and Trimcap

Next solder on the socket. Take care to ensure the socket is solidly soldered on. Solder on the trimcap, taking care to orient the flat side as shown. Then add the coil. The instructable for making the coils is here.

Step 4: Solder on the Transistor

Finally add the transistor, taking care to orient the pins correctly.

Step 5: Add the Power Connections

Solder on the positive lead from the PP3 clip to +9V. Add a short length of wire to the ground connection.

Step 6: Prepare the Switch

Bend the positive lead of the switch LED around one of the switch pole legs as shown. Solder and trim the LED leg as shown. Bend over the remaining LED leg to make a loop.

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    44 Discussions

    I don't know I'm afraid. The design comes from Tetsuo Kogawa, so might be worth asking him:
    http://anarchy.translocal.jp/

    0
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    Txer

    3 years ago

    I don't mean to be funny here .but how does a 10pf manage to get you on the fm band I only find that 30pf and above gets me on fm band .or is because in different country's the fm band is different ?

    1 reply

    I'm afraid I have no idea why it works but the 10pf has been fine evry time for me in the UK..

    nice work. i want to build one. can i replace the 9V battery with USB connector? Would it be enough its 5V 1A to power the device?

    well basically its a prototyping board, its a prepunched pcb grid with each hole having a copper circle around it, and you draw paths with solder rather than making a print of the paths ahead of time, would using solder as thhe conductor be an issue?

    Yes, it is the trimmer capacitor, tuned with a trim tool or screwdriver.

    Niftymitter broadcasts any audio signal that you put into it on FM radio over about a 20m radius so that you can listen in using a FM radio. like an iTrip.

    Schematics can be found at Tetsuo's site here:
    http://www.translocal.jp/radio/micro/howtosimplestTX.html

    Or as a .png here:
    http://niftymitter.googlecode.com/files/niftymitter%200.23%20electronics%20schematic.png

    Or as a eaglecad .sch (not a very good one at the moment to be honest - please improve) here:
    http://niftymitter.googlecode.com/files/0.23.sch

     That is a hole to solder on an antenna if you fancy. I don't know much about how one should do that. Will annotate it better in future versions.