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[Administrator]

In here any one can ask Question about FM transmitter problem. If you want to make a FM transmitter and try to make it but face same problem like your project doesnt worked , you cant find appropriate parts ICs Transistor , indicator value , . How FM works. if u know how to troubleshoot transmitter or if u know ans about our member Question than pls write down it.
So , Any kinds of FM transmitter related problem or solution you can share with us.



  Regard

[Amir]

I m a new user. i assembled ur 1.5watt fm transmitter circuit(range 1-2km). i m not understanding some parts of it. such as the polarity of c1,c2. i can't understand p1. because p1 is 25k  3-leg variable resister. how can i connect p1.another problem i faced.where i can found thin guage wair .i also want to know delails information about antinna. plase help me.

[ahmad2005]

Mr Amir ,
           Thanks for your comment. We are very sorry for our late to reply. We saw ur question and understand.  
   your circuit is.. http://www.eee-lab.com/radio/fm-radio-transmitter/45-fm-transmitter-01
  
  1. C1 , C2 are capacitor that is 4.7 ?F
  2. P1 is a variable resistor u know that. for connecting process see the pic and diagram. Its easy to Understand. Resistor middle pin is connected to the capacitor C1 . and where u connect other two pin i think u can understand that.
  
  3. In vashany stadium market there are lots of shops they sell all types of electronics parts and gauge wire .

Thanks
Regard

[Amir]

Many Many thanks for reply. you ask me to connect middle pin with capacitor. but capacitor has two terminal. here i want to know which terminal is appropriate (+ev/ -ve)

another problem.2-5pf capacitor also have 3 pin. how can i connect this??.

which frequency it will work? is mobile Fm is suitable as a receiver of this transmitter???
i want also know about antenna. such as how long it is.

[Administrator]

you asked:

Many Many thanks for reply. you ask me to connect middle pin with capacitor. but capacitor has two terminal. here i want to know which terminal is appropriate (+ev/ -ve)

1) Here we can use non-polar Capacitor in all. so no need to mention  polarity of capacitor. any way you connect it.

another problem.2-5pf capacitor also have 3 pin. how can i connect this??.

2) here u need to 2 pin variable timer capacitor.

which frequency it will work?

3) frequency is depend on capacitance of capacitor (C5) and value of inductance of inductor. to find the frequency we use

is mobile Fm is suitable as a receiver of this transmitter???
i want also know about antenna. such as how long it is.

4) of course you can use mobile FM receiver . 160cm Hookup wire for antenna.