We have earlier discussed how to make the simplest FM transmitter, now it’s time to make a TV transmitter.
We can broadcast our DVD playbacks, etc to our neighborhood area by use of this circuit. But I tell you a thing, this type of circuit should be used for testing purposes and projects, we aren’t legally allowed to broadcast in TV frequency.
This below circuit will broadcast our video/audio to VHF band channel no 9, we can adjust channel number by the help of a trimmer also.
All we need is basic electronics knowledge, some wires, a RF box(av to rf converter, usually used inside cdplayer, dth etc), a 5V supply and a stick Ariel. The following figure is of such a RF box.
This RF box won’t cost you more than 25 rupees, so the total cost of this circuit is around 50 rupees only.
You should connect the Audio(Red/white) cable to the 1st pin, +5Volts supply to the 2nd pin, Video(yellow) to 3rd and com(gnd) to 4th pin.
The RF output tap should be connected to stick aerial (separated from gnd), and kept in height vertically. By default, it will broadcast on Channel 9, but you can adjust the output channel frequency by trimming the IF coil there(small blue).
The range is about 100-150 meters if everything is set up properly.
Read more about fm transmitter circuit here.
Comments on this article before 07-12-2011, here jump to recent comments .
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zinaung on May 17, 2011 – 6:42 pm
I am zinaung from yangon,I want to need simple RF converter circuits .are u send me this circuits.
Arup Reply:
May 17th, 2011 at 10:02 pm@zinaung,
Stay tuned to our updates, you’ll receive such circuits soon. -
yogi on June 9, 2011 – 9:34 pm
can u post ckt diagram of this tv tx
June 9th, 2011 at 9:39 pmEven if I post the circuit diagram, it will consist of 50+ components so hard to make. Just buy the RF modulator from electronics shop at 20-25 rupees.yogi Reply:
June 10th, 2011 at 7:59 amsir plz post ckt i am interested
June 10th, 2011 at 10:29 amThis is here: http://2.bp.blogspot.com/_kI63MkZyZzI/THZWIzUan4I/AAAAAAAAAGY/2X8KUigTGlI/s1600/Picture+008.jpgThe coils used there you should buy. Ask the electronics shopkeeper for FM radio coil set. -
by kumar on June 10, 2011 – 8:24 am
Sir,we can transmit the tv signal in to air and let me know how can i receive the transmitted signal and post receiver ckt if u have.thank u
June 10th, 2011 at 10:29 amYou can receive the signal in TV by TV antenna. No special circuit needed. The TV antenna will do it.[Reply] -
Pradeep kumar on September 29, 2011 – 7:12 am
sir, how can i build a tv antena. now a day it is not available in market
I love everything you say about this electronic
please send complete diagram of video + sound transmitter. Ur not showed pin connection of IC plz mention it & plz tell me this ic is available in market easily. plz write detail info regarding ur video transmitter & its input + receiving signal type i mean composite video or else as input 4 receiving type means PAL or NTS thanks
Pls explain antenna design to be use with this gadget.
Thankyou.
Just an ariel antenna.
How can i improve the distance range of the transmitter to about 10 kms
Use a RF amplifier. But I warn you that maybe illegal.
plse’give me a diagram of simple video transmitter circuit
Hellow Arup I was searching for a TV signal transmitter for DVD / Video camera to TV wireless link but not found any vendo in India. Some models are available to foreign seller which would not be available to me. Now I like to know how I can get your unit finished and whether signal can be received in 2 or 3 TV sets around 100 mtrs radious. If you pleae reply me, I shall be thankful to you.
Shankardev. ( though I am not a technical person, keep interest on useful electronic devices )
It should work, however you need a good antenna setup.
mujhe ek remote cntrol car ka ckt chahiye jo easy ho aur usko explain b krna plz ki vo kaise wrk kr rha h kaise signal catch krta h full define plz ok
aur plz mujhe mail krke bta dena ki apne uplod kr diya h
Hi Arup,
I already have a AV to RF Modulator (Given to me by my brother-in-law). I works with an FM antenna connected to its RF Out, but, the Coaxial wire should be very near or on the Antenna to get good signal.
So, to increase its range, I need a good RF amplifier & antenna.
Where can i get this RF Amplifier in Bangalore (S.P.Road), like what should i ask those dumb shopkeepers? I want to transmit from ground floor to 1st floor?
And, also what type of antenna should i get or make?
Bye,
PRAVARDHAN
A good FM antenna(1m, brass) will do the work.
For amplifier, get broadband amplifier or cable amplifier from the shop. Tell them that you need an amplifier for cable TV.
Thanks for the reply.
What kind of antenna, Yagi or Whip (FM) type? Bcoz, it contains video also. Can u send a picture of it?
For the amplifier, how much Watts should i go for to transmit 20ft to 30ft from downstairs to upstairs?
Yagi antennas are best, but probably hard to find nowadays, so you might end up setting a FM antenna.
So, what will be the cost of the Cable Amplifier and how much power – dB or Watts that i should go for?
So the Fm Antenna has only one wire, but the RF modulator has 2. i.e, Ground and the main RF. So, How to connect?
I also found out in the internet that we should use a 75ohm to 300ohm transformer b/w RF transmitter & the Antenna.
At the range you need (3-5m), 5dbi will be enough however the more the better.
I guess cost of cable amplifier should be around Rs.600.
For yagi antenna, one pole will goto RF output while other to ground of the unit. But for FM antenna, you need to connect RF output only without connecting ground.
hi
I have a lot of these cans RFI has been used to convert from one system to another system which broadcasts actually want enlarge this transmitter via loudspeaker simple Baasthaddam one and number 9018 has do one amateur in one forums and I have planned so if you have ideas about strengthening Send this circuitI will be thankful to you.
Sorry but I have no clue on this.
I have this circuit and frequently extracted from Chinese normal CD player and this circuit broadcast system in the production F-Channel 9 and has a range of 50-150 meters and I want to increase the range of Alatogd department or scheme for this purpose and thank you.
i nee a good schematic diagram of that t.v transimiter
can we use antenna directly in rf out of this box
i want to buy this kit but it is not available at my place.can u send me?
i will pay all charges
Good guidance….how can I set my pay tv decoder to free mode?
It’s not working properly as I thought