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How can I wire this up? Answered

I found this today down at the beach, an old broken fm transmitter, and it looks like it had been down there a while. However the transmitter unit itself for some reason is detachable, and it says 5v on the back. Does anyone think it would be possible to wire this up to maybe usb 5v and somehow wire an antenna up to it? That would be so sweet if I could use an old P1 to broadcast a radio station :D

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NachoMahma

9 years ago

. Lost my first reply when the system went down around midnight (Robot time). Here are the high points. . While the pics don't look too bad, water damage is a definite possibility - don't get your hopes up. With the sand in there, I'm guessing the odds of a favorable outcome are real close to zero. Worth a try, but don't get too excited. ;) . Find the manual online. Should have some specs and you're probably going to need it to figure out the 3-button interface if the thing does still work. . It broadcasts on the standard broadcast FM band (88-108MHz), so if you put a booster on it, don't be surprised if you get a visit from the Canadian equiv of the FCC. ;) . No idea what the 5-pin connector is. I'll guess it's for diagnostics. Is that CN2 printed next to it? Since one of the PCB traces goes to SW2, it could be for remote control. . Judging by the size of the components in pic 12, I'm guessing the two square things are not caps.

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PunkguytaNachoMahma

Reply 9 years ago

I just got it to work! I found the perfect thing, A 5v wallwart, and at 0.5amp, the leds a pretty bright. The power connector is a bit loose or something because if I swivel the power jack, it shuts off. I plugged my compter's output into it, but alas, nothing came out of my stereo when I tuned the channel to 96.1, which is the station I had it tuned to on the transmitter. It might be that I don't have an antenna hooked up to my stereo, but it should have came in a little fuzzy at least, but all I heard was static even when I turned it up. How do you think you would attach an antenna to the transmitter?

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PunkguytaNachoMahma

Reply 9 years ago

Just woot? How do I get some actual audio output of this sucker?

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PadlockPunkguyta

Reply 9 years ago

Try playing something right next to your stereo. If that doesn't work, look for a wire, or a trace on the PCB board that's particularly long and winding, and leads to no where... this would be the antenna. If there isn't one, then that's your problem. Look for a spot wear a wire might have broken off, or the solder broke, etcetera.

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PadlockPadlock

Reply 9 years ago

If you still don't get anything, try soldering another foot of wire to the antenna, and then try hooking it up to an oscilloscope. It could just be that the transmitter chip is busted. (Besides... you can buy these things for $5 - $10 at Target)

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11010010110NachoMahma

Reply 9 years ago

those black components are caps. the numbers are uF and V and the white line is +

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PunkguytaNachoMahma

Reply 9 years ago

That's always a real bummer even when you're in the middle of posting an instructable and your browser crashes, I know how ya feel. Fortunately, they've invented a new save feature into the editor, pretty nifty if I say.

You're right, it probably is a gonner, but the fm transmitter circuits themselves seem to have been better sealed. None of the componants look corroded in any way, and the lcd might even still work. I suppose I need to find a 5 volt wall brick and the right end, or solder power wires onto the pcb?

>Find the manual online. Should have some specs and you're probably going to need it to figure out the 3-button interface if the thing does still work.

. That might be an idea, the Griffin Roadtrip is discontinued, but thankfully there's a manual.

However, it doesn't really help as far as schematics go when finding points to solder an antenna to.

> It broadcasts on the standard broadcast FM band (88-108MHz), so if you put a booster on it, don't be surprised if you get a visit from the Canadian equiv of the FCC. ;)

.How the hell would they know Where to find me??!

>No idea what the 5-pin connector is. I'll guess it's for diagnostics. Is that CN2 printed next to it? Since one of the PCB traces goes to SW2, it could be for remote control.

.I just looked at that. Pin 1 and 2 go to buttons 1 and 2. Pin 3 appears to be a power trace, as it connects at the underside of the board, I made a new note in the underside picture of the board to show you. Pin 4 traces to a smd resistor, and then to the 2nd? leg of the chip on the bottom right corner of the pcb, as I'll mark above in picture 9. Look in picture 12 also for pin 5.

Interesting connections.

I'm gonna try applying 5v to it and see what happens

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PunkguytaPunkguyta

Reply 9 years ago

Oh, upon inspecting the pdf of the manual, apparently this unit can be used as a desktop unit with a usb-audio combination cable (usb apparently just provides power). So I was right, I can wire it to a usb jack :P. I also have a handy usb hub that has 2.0 amps of power so that should be enough.

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lemonie

9 years ago

You think this might have been in working order when it was discarded? Good luck! L

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Punkguytalemonie

Reply 9 years ago

No, the part that plugged into the car lighter socket was broken, and that's why I assume it was thrown out.

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gmoon

9 years ago

Looks like the transmitter is on the daughter board: BH1415F IC. The small can (7.600) is a crystal for the transmitter (the datasheet shows a 7.6 mHz xtal.) You might be able to get that board working on it's own, by working backwards from the pinouts on the datasheet....

The Holtek IC is an LCD driver.

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Punkguytagmoon

Reply 9 years ago

Oooo thank you very much gmoon!. Me is starting to think a breadboard would come in handy...

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11010010110

9 years ago

if the stereo wont work as whole - it can haz good amplifier chips in it

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Patented

9 years ago

Everytime I go to the beach I always find Nice things, last time it was that singing fish , I open it up and I got 2 motors, phototransistor, wires,switches... For your problem , you should check the amp of the usb putput and look for the radio one and see if its the same, if not find a wall plug transformer with same voltage and amp. Good luck!

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PatentedPatented

Reply 9 years ago

Or maybe just google the model and the brand, maybe there will be like a online guide so you could see more infos on it?!