AM/FM Transmitter Pair

The FM Transmitter boards arrived!

Parts should arrive today or tomorrow, I'll post results of how well it works

Boards are in the mail, should be here soon!

A current list of the features, as with the status this will be updated in the details.

AM features - 

- choice between 9V and 12V power source

- 5V USB port for powering phone/ipod (only works on 12V power)

- Indicator LED, intended to get brighter with tuning.  Seems to be more of a status, considering removal or changing to purely a power indicator

- Antenna out, connect an antenna for limited range broadcast (3' is the scope of the project, enough to sit at your desk, not intended to broadcast from your attic to your basement)

- Line out, feeds antenna through capicitor so you can clip a line directly to your radios antenna, in my opinion the most useful part of this as it allows a simple audio conversion from ipod to AM radio

- Fits in an Altoids tin

FM features - 

- Antenna out, range not yet determined

- Line out, same as AM

- Footprint of a 9V battery

Created the project, I put the status in this log and the details, and as I post status updates in the log I will keep it updated in the details.

AM status -

Version 1.0 - Arrived with no plated holes, guess OSH park can only handle 1 drill file, oops... drilled the holes myself, got useful prototype info and poof that it works

Version 1.2 - Much better, fixed some layout issues, need to increase pad spacing for the inductors and make life easier by getting a upward facing switch. When using 9V battery, there is a hum that is eliminated by touching ground (either crystal case or linear regulator heatsink). Need to troubleshoot.

FM Status -

Version 1.0 - Designed and layed out on a 9V size rectangle, board should arrive the week of August 10th, 2014. Unsure if I will change the layout size to match that of the AM board.