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Hello-------- If you are thinking of
making an FM Transmitter
your search is over here. This is a fully working
FM transmitter circuit 1 Watt !
two kilo meters range
guaranteed with crystal clear sound
the circuit looks like this
and if you look at the
components which are acquired is this way
we 've got the transistors
the resistors capacitors you can note them down
and the coil I finally the
other components like
trimmer , mic , coaxial cable
antenna a GP antenna ground plane antenna
and that's how it starts giving
about guaranteed 2 kilo meters range you can even get more than two
kilometres
using a Yagi antenna that is a directional antenna
otherwise with GP antenna
its two kilo metre diameter range
even if it is kept inside the
house. this is what is
the transmitter --- let me tell you you are trying to assemble this
it's not an easy job if you are a
hobbyist if you are a beginner you will have frustrating experience
I'm not going to scare you for this but the reason behind this that these are all
high-frequency device high frequency operation
in the process slightest mistake of slight
layout mistake a slight soldering mistake
will drastically reduce its range
in particular and then their chances at the company might get
damaged too. this is what is a
the precaution that one has to take if you would like to
assemble such kind of transmitter let me explain you the function of this
we have a microphone here and then the microphone of course it takes into
condenser microphone we have a
resistor biasing the microphone
and then we do with the capacitor we feed it to a transistor
this transistor ia dual function is also is an oscillator that
transistor where L & C
is made here .The L & C forces this transistor to oscillate at that particular
frequency
how it is set by this trimmer
and this trimmer could be about 22 pf
and you can adjust that frequency or even increasing the spacing between
the coils
in the coil that in the spacing also
then the output from here is given to another transistor which is the
buffer transistor what we do is the amplification of whatever frequency
the modulation takes place through this
audio here and that is finally
sent to another
power amplifier which is ultimately delivering the
power to a tuned circuit comprising of this kind of L
and these kind of C and the trimmer on & you will be surprised why so many covers it does
I used in the positive and negative maybe this is because
this being very high frequency operation and I
particularly the FM range is from 88 to
108
mega hertz so you can add just the frequency any where by this
and the range can be adjusted by this
one can use of some kind of
a meter some kind of
field strength meter
to see that the range is achieved to the maximum that it's requiredthat is
possible
so the biggest advantage of this is that you if you use a GP
antenna you had a quite a long range
GP antenna is
ground plane antenna and a it can be fabricated
the details also will be given
at a later date in the audio visual again look at the assembled PCB here
we had this space for the microphone here which could be
connected to some cabinet
which we will see it later this is the capacitor
for the capacitor for that condenser microphone and this is the biasing resistor for
for that
this is the first transistor that oscillation
takes place here this is the first coil and this is the
trimmer and then we have a tapping
it is taken from here and then given to the second transistor
the the second transistor and the these are certain capacitors as we say that has to be
connected far decoupling the power supply
then we have the next coil and I
the other at a men's which is that in this epic you can see the number and the
no auto correction from here
and then finally the public can just take your the pot on the state provide
aid
VK heatsink he did he's in being
that the huge think he's there embedded DVR a guy that the lineup while I do it
is going to be handled by this
have been pretty good when we feed it to me tell you what source
and then we have at the last quite fun the
power for our device power time just to hear and enough for the that the onset
get fed via one more
hey &nb team of and of course the
I that decoupling requirement for the septic
so this is how the intercepted more looks like
the lessee how you put it in a box
so that we get it the good finished
of this this is how we put it inside a box
and the power and speech we have in a lady indication
farrah whether it is switched on Nov knock then we have a
who in Portsea of 140 Michael for and one for the
dogs led in part which could be fed from any computer
on any audio device far
music are like 25 min about hats
this is how how it looks like from the hat eine lady a and we have a
the antenna wheat is a many funny coaxial cable I V say
the DP and did not we be headed scene actually a tough time
and then ninety suck it for the TV antenna here
we have an arraignment ya with an AUD and
is switch his speech is provided for test for bus
that hard the point when you're going to test it seated on see that the light is
blameworthy the power heard anybody
I followed the UAE an indication and once you are satisfied that the I
followed eine correct
and then you can put the top to the hand in a more and a
it starts the leading power
the DC Circuit mad people write about their Lord supply
the bottom end far the device the park and there was anything less than 100
million guess
and a but again these are you will use or to find in me and get our so
a DC sorts and finally the GP and imagine he said the ground plane antenna
which is that again
fabricated we take some an alliance and the
aluminium unless Martin never item I tolerate aluminium handle aluminium
and in the area papi we have so many npr we are not that
after our bed I by 11 a.m. and it quite clearly cable is connected
the device as we have seen idea
and Excel the only system is compete
hey do you %uh before that it's a device
of very high frequency if you are a beginner
he and if you tried to attempt this perhaps
this sucks a state will be video a TV DVD player
so it's advisable is not that I'm willing to sell a product which is
advisable
that do buy this product and a
to get enough on the problem of has to use of
lark getting the output pass it back
the product is also supplied tweet other actresses
Lake and FM radio we took like this
but to back to back up far marked up
tell outlets back to back up
an adept at AC adapter firm and it holds
82 230 or DC
delivering tell you are UTC marlon ampia
power affect dodi quite a bit of course is very low
but this is for a safety
all supplied a long week him microphone
with the mono microphone 5
Hughes reedy
device