I am building a simple FM radio transmitter

[qoo]

Well, its not so simple for me actually. Thats the project I have
chosen for this semester. The most basic circuit I have found on
Internet is this:

http://www.electronics-project-design.com/FMTransmitter.html

Please tell me what does BC547 doing here and what is its alternative?
and please do tell me more about that electret microphone. Thanks

 

[Tim]

In article <ftlmf8$rd9$1@usenet01.srv.cis.pitt.edu>,
zekfrivo@zekfrivolous.com says...

In article <f65b36ff-b705-4b5e-8161-30032d5c54e1@1g2000prf.googlegroups.com>, qoo <faizanahmed666@gmail.com> wrote:
Well, its not so simple for me actually. Thats the project I have
chosen for this semester. The most basic circuit I have found on
Internet is this:

http://www.electronics-project-design.com/FMTransmitter.html

Please tell me what does BC547 doing here and what is its alternative?
and please do tell me more about that electret microphone. Thanks

The BC547 is a sinple small signal transistor. A NTE123AP
is equivalant.


The electret mic requires a battery potential to make it work. It has an internal fet
buffer inside which acts more like a current amplifier. Most small capsules will work.

greg

The URL gives a good explanation of the circuit too. Interesting little
bug....

- Tim -