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| Electronic Projects A collection of small electronic circuits and projects you can build. |
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29th November 2004, 04:16 AM
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| New Member     |  Some Simple FM Transmitters I have quite a few so I decided to post many FM transmitter schematics. |
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29th November 2004, 12:23 PM
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| Super Moderator  | What about component values in the first schematic? "fmtrans2.gif"
__________________ "There is no way to peace, peace is the way!" |
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29th November 2004, 04:59 PM
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| New Member | got them here somewhere... sorry about that... I got them somewhere here in about 50 megs worth of my personal garbage :? . |
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15th December 2004, 03:00 PM
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| New Member | would it reaaly work if i connect it will this circuit design work if i go by your diagram?(the 2nd one)
__________________ the future of engineerng through my eyes! |
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16th December 2004, 04:03 AM
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| New Member | it should work as long as you follow the schematic closely and dont use a breadboard or stripboard use a pcb as the metal tracks breadboard and stripboard tend to act like many little capacitors, causing the radio to not work properly i hope that answers your question... |
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16th December 2004, 12:13 PM
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| Experienced Member   | Isnt the last circuit an AM receiver? I found it from CXI (Circuit exchange Intertnational) schematics. I recommend the 2nd circuit as an FM transmitter since it worked for me. |
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16th December 2004, 11:29 PM
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| New Member | yes it is lol... i have about 200 circuit schematics and about 120 of my own...gets mixed up alot... sry |
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17th December 2004, 03:23 PM
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| Experienced Member | how do I calculate the bandwidth each transmitter delivers? |
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17th December 2004, 03:57 PM
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| Super Moderator   | Quote:
I don't think you do, although suprisingly effective these types of transmitters are horribly crude - the more audio you put into them the higher the deviation of the output. It's not even a 'proper' FM modulation, I suspect you probably get as much AM as FM from them?. But any FM transmitters bandwidth is dependent on the amount of modulation applied - that's why broadcasters have serious limiters on their inputs!. | |
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17th December 2004, 04:43 PM
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| Experienced Member | ok  how do I calculate the modulation level, and what are the units for the modulation level? |
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17th December 2004, 07:45 PM
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| Super Moderator | Quote:
Again, I don't see how you can, the modulation action in these crude transmitters is obscure in how it works, I see no way to calculate it. For an FM transmitter I imagine it would be measured in 'KHz per volt', or something similar?. For an AM transmitter it's in percent. Why do you want to calculate/measure this anyway?. | |
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18th December 2004, 03:00 AM
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| Experienced Member | I want to be able to make my own wireless network between two computers, and further learn radio electronics. |
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18th December 2004, 08:07 AM
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| Super Moderator | Quote:
This isn't the way to do it!. It's far too low a frequency, and far too low a potential data rate for networking. Wireless network components cost very little these days and give excellent speed and performance - you would probably spend more building crude radio systems for a system more than a thousand times slower!. | |
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18th December 2004, 09:52 PM
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| New Member | Quote:
these are not for those kind of uses. these are simply the basic design for audio transmitters, not data transmitters. like nigel said, they are too low of a frequency and would get far too much interference and data loss. if you are really interested in learning about radios, the best way would probably be to buy a good-quality diy kit i hope that helps... | |
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11th June 2005, 06:26 AM
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| New Member | Re: Some Simple FM Transmitters Quote:
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