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

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

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.

Participated in the
Homemade Holidays Contest

Be the First to Share

    Recommendations

    • Backyard Contest

      Backyard Contest
    • Silly Hats Speed Challenge

      Silly Hats Speed Challenge
    • Finish It Already Speed Challenge

      Finish It Already Speed Challenge

    44 Discussions

    0
    SulabD
    SulabD

    4 years ago

    Can i use 2N3904 transistor??

    0
    royshearer
    royshearer

    Reply 4 years ago

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

    0
    Txer
    Txer

    5 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 ?

    0
    royshearer
    royshearer

    Reply 5 years ago

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

    0
    lseemann
    lseemann

    6 years ago on Introduction

    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?

    0
    sciencetor2
    sciencetor2

    7 years ago on Introduction

    are solder lines on an all purpose radioshack pcb not an option here as an alternative to etching?

    0
    sciencetor2
    sciencetor2

    Reply 7 years ago on Introduction

    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?

    0
    jtc10512
    jtc10512

    8 years ago on Step 4

    is that pink thing in the center the tuner?

    0
    royshearer
    royshearer

    Reply 8 years ago on Step 4

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

    0
    royshearer
    royshearer

    Reply 9 years ago on Introduction

    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.

    0
    technozook
    technozook

    9 years ago on Introduction

    could you post a scamatic cus i cant etch my own board

    0
    royshearer
    royshearer

    Reply 9 years ago on Introduction

    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

    0
    bobrob5k
    bobrob5k

    9 years ago on Introduction

    is it possible to make this work with out a battery?

    0
    royshearer
    royshearer

    Reply 9 years ago on Introduction

    I would imagine so, just use a 9v power supply in place of the battery?

    0
    coolacid
    coolacid

    10 years ago on Introduction

    What goes in the Y-ish symbol between the 9V and the GND?

    0
    royshearer
    royshearer

    Reply 10 years ago on Introduction

     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.