Comments on: FM stereo transmitter

By: Ted

Ted — Mon, 24 Aug 2009 14:46:17 +0000

In any gadgets with music I prefer using the ones with fm transmitters, because it is always good to hear brand new hit musics not only from the ones you have downloaded but also you will not be bored to hear the same thing again shuffling from your gadgets.

By: ktech123

ktech123 — Mon, 20 Oct 2008 21:45:33 +0000

||philly||, did you get something about your question?

I would like to know about a high power FM transmitter. It would be nice to be able to hear my ipod in my car, but commercial FM transmitters don’t have enought power…

Anyone has any clue about this?

By: YanK (développeur web)

YanK (développeur web) — Sun, 19 Oct 2008 13:54:09 +0000

Thanks kurf, but electronickits don’t ship in France. Thanks for the link. ;)

By: kurf

kurf — Sat, 18 Oct 2008 03:59:05 +0000

@yank

I think this might be what your looking for.

http://www.electronickits.com/kit/complete/video/ck2100.htm

By: YanK (développeur web)

YanK (développeur web) — Thu, 16 Oct 2008 09:53:55 +0000

Hello,
Good job for this transmitter. ;)

Someone know a same DIY for transmit video and audio on UHF or VHF ?

I would like to transmit video on a tv in my house. :)
Thanks

By: ||philly||

||philly|| — Thu, 16 Oct 2008 04:35:31 +0000

ok, i want to make something like this with the least amount of supplies and the least sophisticated parts. while making a strong signal that might break the fcc’s signal strength rule, but stay within their distance regulations, does anyone think this is possible?

By: strider_mt2k

strider_mt2k — Wed, 15 Oct 2008 17:30:55 +0000

Federal, state, and local laws.

Don’t be a jerk.

By: strider_mt2k

strider_mt2k — Wed, 15 Oct 2008 17:29:54 +0000

this is the key ingredient to an fm radio station too, if sufficiently augmented on both the audio and RF sides.

check your local laws kids, and don’t rebroadcast.

come up with your own original content or don’t bother. :p

By: draeath

draeath — Wed, 15 Oct 2008 15:03:59 +0000

@ben

Point it at a radio, tune to their station, and give ‘em a nice feedback squeal.

Good way to get people to stop blaring that hip-hop crap :P

By: Mike Y

Mike Y — Wed, 15 Oct 2008 14:19:54 +0000

> Can you use the rotary encoder from an old PC mouse?

I’m sure; I’ve tried constructing one of these for a ham project, but it’s too dang difficult to get everything lined up. But, you get the same quadrature signal as a mechanical encoder (without the bouncing signals!). I need to do an EagleCad schematic for this, as I’ve added 74HC14 and an RC debounce circuit for the cheap, $1.70 Bourns encoder. Works fine.

Would it be possible to use an Atmega8 16PU / 3.3V ?

Heck yes, and no translation from 5V to 3V I2C signals. On the breadboard, I used just a resistor pullup to 3.3v, but in the final version, I’m using a SparkFun 5V to 3.3V board.
If you don’t need the LCD, I think you could get by with 2 pins (I2C), so an ATTINY85 might do; just re-flash it to change the frequency.

What kind of range do you get from 2mw?

I can go about 65 feet with it. After that – pretty sharp drop-off. Drive is with about 60% volume on an iPod nano, no input amplification needed. I was going to add compression/limiting, but that’d probably be ‘gilding the lily’.

Mike Y
KM5Z
Dallas, Texas

By: Edward Nardella

Edward Nardella — Wed, 15 Oct 2008 05:37:03 +0000

I wonder if I could put one of these in my Acer Aspire One?

By: nubie

nubie — Wed, 15 Oct 2008 04:23:47 +0000

Follow up, if the Atmega8 16pu will work with 3.3v I/O can I run the whole thing on 3.3v?

I don’t need a display, just pure functionality.

By: nubie

nubie — Wed, 15 Oct 2008 03:16:42 +0000

Hey Mike Y:

Can you use the rotary encoder from an old PC mouse?

I have one tied to a VCR head to make a huge aluminium knob :)

Would it be possible to use an Atmega8 16PU ? that is what I have on hand.

What kind of range do you get from 2mw?

By: ben

ben — Tue, 14 Oct 2008 22:32:41 +0000

Wouldn’t it be awesome if you could combine this with a parabolic microphone and transmit random conversations on top of local radio stations ;P

By: Mike Y

Mike Y — Tue, 14 Oct 2008 20:23:03 +0000

Thanks. Wow, I made Hackaday…

Yes, no new ideas here; just integrating a bunch of things I’ve learned from others out there.

There are two versions of code (.PDE) there. The original uses up and down switches, plus an off/on-air toggle. The most recent version is compatible with the latest Arduino 0012, and uses a single rotary encoder for change frequency and toggle on-air. Photos of the finished item in an enclosure hopefully this week.