29 December 2005

Build Your Own iMouse FM Transmitter. Plans Included!


Raymond, who built the iMouse from our last post, was kind enough to send us the plans including a schematic. We had quite a few readers interested in how to build one so here's your chance. Give it a try and be sure to send us pics and stories of your attempts.

Raymond's plans (of which the image above is the schematic) follow:

Build your own iMouse

Parts-list:

Transistor:
T3 ...............................2N2219a
Capacitor:
C3 ...............................1 μF/16 V
C4,C5 .........................1 nF ker.
C6 trimmer capacitor...4-40 pF
C7 ...............................10 pF ker.
Resistor:
R5 Trimmer.................10 kΩ
R6 .............................. 10 kΩ
R7 ...............................2,7 kΩ
R8................................1 kΩ

Spool L1:
Use a 10 cm long Silver wire.
The diameter inside the spool should be 3 mm.
7 winds total
Length of the spool should be 15 mm (f-g)
The antenna is connected to the spool at 3mm from f

a: + 9volt
b: ground
c: audio in
Ground your audio input to b
For the antenna you can use a copper wire (70 cm)
With R5 you can adjust the input signal and with C6 you can tune your frequency.


[flickr photo page]

13 comments:

pasteler0 said...

how to set the frequency?

Anonymous said...

you set it with the trimmer?
do you think you could show a close up view of it or some better plans?
cant find all the parts on the list

Siau said...

Will it be illegal? Cause it transmits up to 150 metres.

Anonymous said...

Do you have the parts layout for the transmitter schematics?

Anonymous said...

Can you put a closer picture of the circuit board on? i just bought all the parts and could use a closer pic. THANKS!

Anonymous said...

Same with the person before me, can you please somehow make a bigger image of the plans?

Randy Bowman said...

Has anyone successfuly built this yet? I've jury rigged it, but it's not working...I didn't have a trimmer capacitor laying around so I used a 33pf one instead, and I'm not sure on the state of other parts. ;)
Jameco Electronics is a great place to get stuff - trimmer capacitors, Variable resistors, and Transistors in case you didn't notice, those links are the parts necessary for the iMouse).
Anyway, it would be nice to have more/better pics of the breadboard, and a better schematic design. I'll keep you posted on my attempts.

Anonymous said...

Can't you use something else instead of silver wire for the spool? It's pretty hard to get (and expensive?).

Sompie said...

Can you use this on any mp3-player.
Because I won a use it on my creative zen micro

S0mpie said...

Can you ad an picture off the backside off the prin please.
It well be verry helpfull.
Thank you

Anonymous said...

How about using this Maxim FM transmitter IC.
http://www.maxim-ic.com/appnotes.cfm/an_pk/1869

ikhnaton2 said...

What changes required if I need to connect it to car battery (12V)?

beth said...

Why build it when you can get one off ebay for like $3.00 and modify it for a few dollars?

I made one here that if you add an additional AAA battery, can easily get about 1/2 mile range.

It's not legal, but... that isn't the point.