2 Watts FM transmitter


Rating: 10.00 / 10 
Inside Circuits

This is a nice 2 Watts FM transmitter. It has a Super-Sensitive pre-amplification with BC109 and BC177 with more than 100% signal modulation. The job finish the 2N2219 by Motorola. For the Coils you should use 1mm wire(enameled), L1= 3 turns - 10mm diameter, L2= 1 turn - 10mm diameter. R9 trimmer controls the modulation gain. The tunning is easy by controlling C9 trimmer (88-108 MHz). The RFC J should be the VK220J with ferrite (VK200 is not suitable).

sponsored links

2 Watts FM transmitter - img1

You will be amazed how well this little monster can transmit several kilometers excellent quality sound. Feed input from a simple cd player or PC (win amp) or just connect a microphone. Enjoy!

Datasheet file1: Click here to download BC109.pdf datasheet.

Datasheet file2: Click here to download BC177.pdf datasheet.

Datasheet file3: Click here to download 2N2219.pdf datasheet.

sponsored links


Jan 9, 2008 Berek Jeams

remarkable!! Mine goes 3 km far! Just great

Apr 11, 2008 Manai

very very good FM transmitter,i will try to do it but i need the PCB circuit :)

May 17, 2008 nermin

Yes,another small transmitter.Nice but of course can not give 2W of output power.Anyone who have power meter can see that.According My previous works this thing could give some 100-300 mW,depending of many factors.But for beginners nice project for test.Good luck.

Sep 29, 2008 Tarun Dasgupta

Nice project indeed ! Details of the RFCJ is needed (inductance ect.) so that one can make it of its own.Also, the output impedence (required for matching the antenna) is not mentioned. Best regarts, Tarun.

Oct 31, 2008 hama ersal

hi .. yeah its simple

Nov 2, 2008

Nice project. What is the RFCJ, and is C8 also a variable capacitor?

Nov 2, 2008

could u explain how L1 and L2 is connected, it would be greatly appreciated!

Nov 20, 2008 MAHESH

kindly tell me how many turns for rfcj&how to connect l1 l2

May 21, 2009 anas

Nice project. but what is the range

Aug 14, 2009 abhi

need the value of output transformer

Aug 14, 2009 abhi

need the value of output transformer,value of RFCj

Aug 20, 2009 kap aryan

this is the simpliest schematic diagram i see and now alread tested

Jan 14, 2010

Hi, friend! You forgot the coils details uh?

Feb 8, 2010 2nel

Need the value of output transformer,value of RFCj ...Grazie!

Jan 17, 2012 flö

I can't find that "VK220J" anywhere on the web. is there an alternative? did that part ever exist?

Nov 30, 2011 Frank

yo what the f...k is the value of L3

Leave Comment

characters left:

  • Circuits