Previous in Forum: Need Suggestions for Selection of Best Topics in Electronics and Communication Domain For Technical Paper Presentation   Next in Forum: 90 Degrees Phase Shift for Input Signal
Close
Close
Close
11 comments
Associate

Join Date: Mar 2015
Location: INDIA
Posts: 49

Working FM Transmitter Circuit

03/04/2015 10:03 PM

I tried many fm transmitter circuits which showed zero results. Please provide some working FM TRANSMITTER circuits

__________________
Success is a wall made by bricks called failures.
Register to Reply
Pathfinder Tags: FM radio transmitter
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Guru

Join Date: Oct 2008
Posts: 42294
Good Answers: 1662
#1

Re: Working FM TRANSMITTER circuit.

03/04/2015 10:10 PM

Do your own homework.

Do your own homework. CR4 is not a homework cheat site; however, if you have questions about understanding concepts or how a portion of a problem is derived, these types of questions will be accepted.

You are becoming a pain in the butt.

Learn how to use a search engine.

Register to Reply
Guru
New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
Posts: 8778
Good Answers: 376
#2

Re: Working FM TRANSMITTER circuit.

03/04/2015 10:25 PM

What frequency are we talking about, standard commercial radio band perhaps?

Was it the circuits that were wrong or did you construct them wrong?

Have you tried fault finding them?

__________________
jack of all trades
Register to Reply
Guru

Join Date: Mar 2012
Location: Out of your mind! Not in sight!
Posts: 4425
Good Answers: 107
#3

Re: Working FM TRANSMITTER circuit.

03/04/2015 10:48 PM

Buy one! They will work. Don't expect them to receive AM helps too.

__________________
Common Sense Dictates
Register to Reply
Guru
Hobbies - DIY Welding - Wannabeabettawelda

Join Date: May 2007
Location: Annapolis, Maryland
Posts: 7210
Good Answers: 416
#4

Re: Working FM TRANSMITTER circuit.

03/04/2015 10:59 PM

http://www.analog.com/media/en/technical-documentation/application-notes/AN-543S.dsp

Since this is Analog Devices, there's a pretty good chance their stuff works.

Here's another one you can try.

Good luck with your quest!

Register to Reply Score 1 for Good Answer
Guru
Popular Science - Weaponology - New Member United Kingdom - Member - New Member

Join Date: May 2007
Location: Harlow England
Posts: 16499
Good Answers: 662
#5

Re: Working FM TRANSMITTER circuit.

03/05/2015 3:18 AM

You can't simply build a RF circuit from a circuit diagram.

In fact you can't even build a audio hi preamp just from a circuit diagram as I found out about 40 years ago.

If you are a newbie hobbyist, stick to audio, simple logic and low frequency stuff.

Start with something very simple, once you can understand that and make it work, progress to slightly more complicated stuff.

E.G a simple series regulated power supply using discrete components is a good and useful exercise.... you'll learn far more than if you just wire up a 78L05 , mind even that can go wrong with out the decoupling capacitors

Del

__________________
health warning: These posts may contain traces of nut.
Register to Reply
Guru
Hobbies - DIY Welding - Wannabeabettawelda

Join Date: May 2007
Location: Annapolis, Maryland
Posts: 7210
Good Answers: 416
#7
In reply to #5

Re: Working FM TRANSMITTER circuit.

03/05/2015 1:15 PM

Or for $50 you can buy this and be W - A - A - A - Y ahead of rolling your own.

http://www.amazon.com/KEDSUM%C2%AE-Range-Stereo-Broadcast-Transmitter/dp/B00D826PU6/ref=sr_1_15?ie=UTF8&qid=1425578162&sr=8-15&keywords=fm+transmitter

WARNING: These cheap inexpensive units are not plug-and-play. You will probably need to fiddle with them to get good performance.

I have one of these I run at 50 mW so I can 'carry' my music around the house or yard with just a simple FM Walkman or little boombox. They work pretty well provided you're careful with how you route the power cable relative to the audio cable because it will pick up hum very readily. I also added a split ferrite core (two wraps) to the power supply cable to kill the interference that the little switching power supply couples into the transmitter.

I found some unused spectrum down around 88.3 MHz and made sure I was in the low power setting. If I tune my car radio to my 'pirate' radio station, I lose the signal once I am about two or three houses away, so I don't believe I will incur the wrath of the FCC. (What's that clacking noise I hear on the pavement . . . . . ?)

I just got so tired of COMMERCIAL radio with its 8 to 10 minute blocks of commercials. I much preferred the old format where they played a couple of songs, then a commercial, then a couple more songs and so on. Weekends are especially bad on the radio.

Cheers !

Register to Reply Score 1 for Good Answer
Guru
New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
Posts: 8778
Good Answers: 376
#8
In reply to #5

Re: Working FM TRANSMITTER circuit.

03/05/2015 1:18 PM

You can't simply build a RF circuit from a circuit diagram.

I was thinking he was trying to build one of those short range FM spy bug transmitter circuits that you can pick up on your radio. Those are straight forward to build.

__________________
jack of all trades
Register to Reply
Guru
Popular Science - Weaponology - New Member United Kingdom - Member - New Member

Join Date: May 2007
Location: Harlow England
Posts: 16499
Good Answers: 662
#9
In reply to #8

Re: Working FM TRANSMITTER circuit.

03/06/2015 2:54 AM

I mean you can't actually physically lay it out like the circuit diagram.

With RF, layout and construction is critical...

But I'm sure you know that, I just suspect the OP doesn't

Del

__________________
health warning: These posts may contain traces of nut.
Register to Reply
Member

Join Date: Mar 2015
Posts: 8
#6

Re: Working FM Transmitter Circuit

03/05/2015 9:05 AM

u should not be ask this type of questions because it is the site to clarify your doubts in concept not to ask the circuit diagram you should search in the search enginr

Register to Reply
Active Contributor

Join Date: Dec 2011
Posts: 16
#10

Re: Working FM Transmitter Circuit

03/06/2015 10:52 AM

What about this, go to www.ebay.com and write

1000W RF Power Amplifier for FM Radio Transmitter,

they have tested boards from 5 W to 1000 Watt low price

=why to invented the wheel ?? You can buy also the POWER Transistors new or rebuild ! on ebay

ITS NOT CLEAR TO ME WHY CAN NOT =COPY AND PASTE= the link on this page??

Thanks-Daveross problem solver see youtube.

Register to Reply Off Topic (Score 5)
Associate

Join Date: Mar 2015
Location: INDIA
Posts: 49
#11

Re: Working FM Transmitter Circuit

03/07/2015 10:41 PM

Thank you brave sir robin for providing ckt. I keep on trying on this.

__________________
Success is a wall made by bricks called failures.
Register to Reply
Register to Reply 11 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

Brave Sir Robin (2); daveross100 (1); Del the cat (2); IdeaSmith (1); jack of all trades (2); Lokeshloki (1); lyn (1); vijay guntimadugu (1)

Previous in Forum: Need Suggestions for Selection of Best Topics in Electronics and Communication Domain For Technical Paper Presentation   Next in Forum: 90 Degrees Phase Shift for Input Signal

Advertisement