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).
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.
Comments
Berek Jeams wrote on Jan 9, 2008
remarkable!! Mine goes 3 km far! Just great
Manai wrote on Apr 11, 2008
very very good FM transmitter,i will try to do it but i need the PCB circuit :)
nermin wrote on May 17, 2008
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.
Tarun Dasgupta wrote on Sep 29, 2008
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.
hama ersal wrote on Oct 31, 2008
hi .. yeah its simple
wrote on Nov 2, 2008
Nice project. What is the RFCJ, and is C8 also a variable capacitor?
wrote on Nov 2, 2008
could u explain how L1 and L2 is connected, it would be greatly appreciated!
MAHESH wrote on Nov 20, 2008
kindly tell me how many turns for rfcj&how to connect l1 l2
anas wrote on May 21, 2009
Nice project. but what is the range
abhi wrote on Aug 14, 2009
need the value of output transformer
abhi wrote on Aug 14, 2009
need the value of output transformer,value of RFCj
kap aryan wrote on Aug 20, 2009
this is the simpliest schematic diagram i see and now alread tested
wrote on Jan 14, 2010
Hi, friend! You forgot the coils details uh?
2nel wrote on Feb 8, 2010
Need the value of output transformer,value of RFCj ...Grazie!
flö wrote on Jan 17, 2012
I can't find that "VK220J" anywhere on the web. is there an alternative? did that part ever exist?
Frank wrote on Nov 30, 2011
yo what the f...k is the value of L3
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