I have armed an FM transmitter on breadboard but for some reason it does not work. I have checked wiring and components and all seems to be OK. Thanks in advance for any comment
FM transmitter does not work on breadboard
Aug 30, 2006
6 Replies
================================= 'Armed' is a funny word to use. Like 'Cocked'... like you have a static hi or lo level on the tx line. You need to hook it to a TTL level serial port sending ASCII 'U' over and over at a slow baud rate like
1200 baud. Should be able to see stuff coming out of receiver at same rate!
By breadboard you mean one of those white plug-in proto boards? One area of trouble I found is the many rows of plug in contacts behave like 5 pf capacitors shorting out the RF. Use a generic copper pad perf board and solder.
Good Luck,
- * * Christopher
Temecula CA.USA
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What style of RF construction did you use ?
Graham
It's a simple FM transmitter with three transistors and an oscillator.
All of your wires for the frequency determining parts are too long.
And the board makes capacitors. RF on proto boards, a real nightmare.
Tom
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