Hybrid FM Stereo Encoder for FM Transmitters - Page 2 - diyAudio
Go Back   Home > Forums > General Interest > Everything Else
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 27th August 2012, 05:08 AM   #11
diyAudio Member
 
Join Date: Aug 2012
Location: Trivandrum, Kerala State
Default Hybrid FM Stereo Encoder for FM Transmitters

I designed an FM Quadraphonic Coder. The circuit diagram of its timing section is attached.
Attached Files
File Type: pdf FM Quadraphonic Encoder.pdf (42.7 KB, 84 views)
  Reply With Quote
Old 21st January 2013, 08:38 PM   #12
diyAudio Member
 
Join Date: Jan 2013
Quote:
Originally Posted by syamkumar View Post
Hi Friends,
I am going to make a Hybrid 256x oversampled FM Stereo Encoder. I know only basic idea of FM stereo multiplexing (like 2x, 8x oversampled circuit) also I read in an article circuits like DAC, Sine LUT ROM etc can be used for higher sampled MPX system. But I don't know how to implement the circuit and where to begin.Please help me. I expect good design ideas and circuits. Sorry for my poor English. Have a nice day
Hi Syamkumar, this is a 1KHz tone in a 16x oversampling coder i am working:

Subefotos.com - Comparte rapidamente tus fotos
Subefotos.com - Comparte rapidamente tus fotos
  Reply With Quote
Old 25th January 2013, 07:00 PM   #13
diyAudio Member
 
Join Date: Jan 2013
Does anyone have a circuit of a MONO FM Transmitter that can be plugged into the USB port of a computer?
In this way it would receive 5 VDC for power and be able to receive audio from the computer.

All the best for 2013 ! Mad Yank
  Reply With Quote
Old 25th January 2013, 07:09 PM   #14
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
This thread is about stereo encoding.
  Reply With Quote
Old 14th January 2017, 04:17 PM   #15
rsavas is offline rsavas  Canada
diyAudio Member
 
Join Date: Aug 2012
Location: Ontario
Hello folks,

Adding to an old thread instead of making a new one.

I want to build a FM stereo encoder for my RF sig generators, HP 8656B and HP 11715A.
Of course one option is to spend more money and buy yet another RF SG like a ST1000A or Panasonic unit but I want to take the cheaper route and build my own just for the fun of it.
I have copied this design.
http://www.inase.org/library/2014/sa...ROBCIRC-29.pdf
How to build an fm-stereo generator.
I have verified that the hex file is good with my MPLab s/w and ICD3 programmer. At this time I did not buy the source code.
Of course I could have paid for the layout files, but I am not sure if they are proper gerber/cnc data or just pdf of the layers. I do not want to pay and find out it is a pdf and I have to etch my own pcb, which is a PITA. Also the size would result in a much more expensive pcb, so did it myself will reduce my costs a fair bit.
So far I have taken this design and done up a small layout(100x100mm) and plan to get it made at pcbway for $10 for 10 deal, which is hard to beat. Since I did the design in smt, I have a fair bit of pcb area left for other circuitry.
I will add an additional composite driver,based on user OS pitchfork headphone amp that I have simulated using ltspice. It offers the performance that I need, so it can drive the 50 ohm input Z of the low THD 11715A AM/FM test source.

I was wondering if anyone has suggestions to add more features?
1) I still need to add the regulators on board, but they do not take up much room.
One thing I should probably add is a couple of low THD oscillators for the left/right channels, instead of having to use external oscillators. I could copy the ST1000A oscillators but their maybe better ckts to use, any suggestions?
I have attached the schematics and pcb placement so far.

Thanks
Rick
Attached Files
File Type: pdf FM STEREO GEN_DDS-6.pdf (52.8 KB, 12 views)
File Type: pdf SCHEMATIC1 _ FM Stereo Gen(DDS).pdf (37.5 KB, 10 views)
  Reply With Quote
Old 14th April 2017, 07:01 PM   #16
diyAudio Member
 
Join Date: Apr 2017
Smile Fm stereo encoder

For those looking at a 256khz oversampled stereo encoder, see the project at radiospurs.uk web site. The design presented is dated around the year 2000 so some of the components used are end of life. Feel free to use the same design principles with newer vesions. I would suggest the Analog Sharc series 5 or the slightly older series 4 as a replacement for the series 2 given
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Vegakit FM Transmitters.. xitronics Everything Else 5 31st March 2011 10:33 AM
FM Acoustics FM 1000 Ultra-High Power Amplifier, the absolute State of the Art? tiefbassuebertr Solid State 0 28th October 2009 05:40 PM
Zenith K731 AM/FM radio audio random cracking sound in FM mode AC439 Tubes / Valves 15 20th February 2009 09:06 PM
FM transmitter stereo encoder help mbates14 Everything Else 11 18th May 2005 04:59 AM


New To Site? Need Help?

All times are GMT. The time now is 05:03 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki