SOT: AM iPod Transmitter, help |
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SOT: AM iPod Transmitter, help |
McMark |
Jan 12 2006, 10:19 PM
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#1
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I'm rebuilding a 57 bug with the original AM radio. I'm interested in the feasibility of an AM transmitter for an iPod. I found this circuit and description, but it's over my head. Could this be made small enough to be portable?
BTW, I'm familiar with FM transmitters and cassette adapters and radios hidden in the glovebox, etc. I'm not interested in anything else. Just AM transmitters. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)
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mightyohm |
Jan 12 2006, 10:31 PM
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#2
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
Looks doable. The hardest part is winding the coils for the inductors unless you can find them premade.
Overall the circuit will be pretty small except for the 140uH inductor and the antenna, which you could probably make into a coil. The fidelity will probably be pretty poor and you may have to retune the radio to follow the transmitter since open loop circuits like that tend to drift. If you picked one frequency to operate at and used a crystal it would be better. The frequency also tends to be "pushed" by nearby metal objects etc. You will also have to fight ignition noise, I don't see much filtering on that circuit and it is probably intended to operate with batteries. Here's a kit that is equally simple, but you won't have to wind your own inductors. http://www.ramseyelectronics.com/cgi-bin/c...action&key=AM1C There may be AM transmitter IC's around. I would think you could make the thing the size of an altoids box with a more modern circuit design. This kit uses a better approach: http://www.ramseyelectronics.com/cgi-bin/c...action&key=AM25 |
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