mr_byte31
Hero Member
 Offline
Posts: 594
Thank You
-Given: 68
-Receive: 144
|
 |
« on: January 26, 2007, 07:06:27 19:06 » |
|
i need an a low cost FM circuit
can any body help me???
|
|
|
|
|
Logged
|
Do not trifle with the Moderators , as you are small, and crunchy, and taste good with ketchup.
|
|
|
Groovy
Junior Member
Offline
Posts: 54
Thank You
-Given: 2
-Receive: 25
|
|
« Reply #1 on: January 26, 2007, 09:54:22 21:54 » |
|
what power do you need, a for what purpose.
|
|
|
|
|
Logged
|
|
|
|
rmmrmm
Junior Member
Offline
Posts: 65
Thank You
-Given: 1
-Receive: 24
|
|
« Reply #2 on: January 27, 2007, 04:08:36 04:08 » |
|
Try to use BA1404 , is one IC fm stereo transmiter , with very few extra components , beside is really cheap ( one dollar ).
|
|
|
|
|
Logged
|
|
|
|
mississippi1
Newbie
Offline
Posts: 27
Thank You
-Given: 26
-Receive: 7
|
|
« Reply #3 on: January 28, 2007, 03:06:47 15:06 » |
|
The TDA7000 series from Philips is als a good receiver for FM signals.
|
|
|
|
|
Logged
|
|
|
|
demon
Junior Member
Offline
Posts: 50
Thank You
-Given: 45
-Receive: 2
|
|
« Reply #4 on: June 13, 2007, 11:02:20 23:02 » |
|
A good site for radio stuff is www.rfcandy.com . Go to the bottom of the page and click on "Back to Home". This will take you to a list of projects. He has several designs of RF TX/RX devices, also some interesting test gear. He also sells the components for his designs. |
|
|
|
|
Logged
|
|
|
|
hamid9543
Active Member
Offline
Posts: 124
Thank You
-Given: 80
-Receive: 7
|
|
« Reply #5 on: June 14, 2007, 06:15:45 06:15 » |
|
hi.very good topic
i want to design fm transmiter for 20 meter !!!
and reciver is radio .
can you help me?
|
|
|
|
|
Logged
|
|
|
|
pl4tonas
Active Member
Offline
Posts: 145
Thank You
-Given: 318
-Receive: 195
|
|
« Reply #6 on: June 14, 2007, 10:44:44 10:44 » |
|
Try this site: http://hem.passagen.se/communication/meny.html There are very interesting circuits and ideas you can use. They sell components at very good prices. I bought from them a couple of times and I am very happy with the delivery time and service. |
|
|
|
|
Logged
|
|
|
|
mr_byte31
Hero Member
Offline
Posts: 594
Thank You
-Given: 68
-Receive: 144
|
|
« Reply #7 on: June 16, 2007, 07:32:35 19:32 » |
|
i found a good circuit and it is working good but its range is 100meter i want a circuit that transmit high power can any body help? the circuit is in this link http://www.electronicsforu.com/EFYLinux/circuit/aug2005/CI-01_Aug05.pdf |
|
|
|
|
Logged
|
Do not trifle with the Moderators , as you are small, and crunchy, and taste good with ketchup.
|
|
|
|
Tre
Guest
|
|
« Reply #8 on: September 01, 2007, 05:25:31 17:25 » |
|
Tuning that circuit will be incredibly difficult without expensive equipment. Look for an integrated solution.
|
|
|
|
|
Logged
|
|
|
|
dideco
Junior Member
Offline
Posts: 39
Thank You
-Given: 7
-Receive: 6
|
|
« Reply #9 on: September 01, 2007, 08:25:09 20:25 » |
|
You can use a streo fm modulators sold for portable audio devices for a very cheap price. They have a PLL circuit inside and most of them have a frequency display. Just buy one less than 20 or 10 USD$, then put a spare antenna after removing radio frequency output from ground and choking coil. If you put a spare antenna, transmit distance will be more than 15-20 meters in the building. And you will have two channels in one  . Some of the chips used for this modulators have ranges exceeding 88-108 MHz bandwith but you shoul digitally program the transmitter modulator chip according to its datasheet. |
|
|
|
|
Logged
|
|
|
|
user112
Junior Member
Offline
Posts: 85
Thank You
-Given: 6
-Receive: 139
Salut tuturor(hello to all)
|
|
« Reply #10 on: September 02, 2007, 08:37:28 20:37 » |
|
It is hard to make FM circuits and very hard to reglate him you must have the apropriate tools you can try to duble the final etage starting from C6 but you must find the good value for the new R7 because it 's important and for more stability (but less amplification) in the new etage you can renounce to VC2 the transistors for final etages can be preferable BF... or equivalents BC series are not sow good to high frequency and attention with legality of this stuff in your country see also http://www.zen22142.zen.co.uk/Circuits/rf/4txtr.htm |
|
|
|
|
Logged
|
|
|
|
freddy
Newbie
Offline
Posts: 15
Thank You
-Given: 0
-Receive: 7
|
|
« Reply #11 on: September 09, 2007, 10:19:04 10:19 » |
|
|
|
|
|
|
Logged
|
|
|
|
|
|
|
