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johnboiles / BaofengUV5R-TRRS

Tiny board that allows you to connect the Baofeng UV5R radio to a smartphone or other device that uses a TRRS connector for audio.
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Parts list #4

Open mcsquared88 opened 10 years ago

mcsquared88 commented 10 years ago

This isn't an issue, but I didn't want to create a Wiki until I was sure this worked.

I created a Digikey shopping cart that contains all of the parts (except the board itself) that you'll need to build this, including the heat shrink tubing. The URL is http://www.digikey.com/short/05zht

Digikey didn't stock the Kenwood K1 plug so instead I included a 3-wire 3.5mm plug and 3-wire 2.5mm plug.

I haven't actually built the device myself yet (I just placed the order), but I'll post another comment and/or create a Wiki page once I've received all of the parts and assembled my working adapter.

The only parts that cost more than a few cents are the three plugs, and you can probably cut up some existing cables and use those plugs though that could make the soldering a lot harder. Since the minimum order for the board itself is three, I recommend you get extras of at least the capacitors and resistors (since they cost pennies) in case you screw up. If you end up with extras, just build an extra cable as a backup, give it to a friend or maybe sell it on eBay to someone who can't be bothered to learn to solder.

Many thanks to John Boiles for posting the instructions!

johnboiles commented 10 years ago

Thank you so much @mcsquared88 ! Once you assemble your board, I'd be happy to reference your Digikey cart in the README.md. Let me know how it works out!

Only issue I see is that your cart has a radial capacitor instead of an 0603 surface mount capacitor.

It's up to personal preference, but I would probably recommend sticking with the Argent Data Kenwood plug that I link to in README.md ($6 + ~$2 shipping) since it makes for such a pretty cable.

mcsquared88 commented 10 years ago

I got the Digi-Key parts in the mail a few days ago but put them aside until the OSH Park shipment arrived. When I opened everything up, I finally realized the scale that these surface-mount devices operate at. The resistors seem to be about the size of two grains of sand! I've fiddled with a soldering iron a few times in the past, but I definitely don't have the skills or the equipment to work with these components. A variable-temperature soldering iron costs $50 and I can't justify that. When I get the chance, I hope to find someone at the local hackerspace who can give me a hand.

For anyone else that still wants to try this, there seems to be a good set of tutorials for surface mount soldering at https://www.sparkfun.com/tutorials/category/2.

Below is a corrected parts list from Digi-Key. The total cost comes to $12.25 (but that includes 4 feet of heat shrink tubing). This uses separate 2.5mm and 3.5mm cords on the Baofeng end (total cost for both is $5.70) just so you can order everything from Digi-Key rather than have to buy the integrated cable from Argent Data for $6 plus $2 shipping. But it probably makes more sense to spend the extra $2.30 and get the integrated cord from Argent Data like John recommended.

Quantity Part Number Description Unit Price 1 311-10KGRCT-ND RES 10K OHM 1/10W 5% 0603 SMD 0.10 2 311-2.20KHRCT-ND RES 2.20K OHM 1/10W 1% 0603 SMD 0.10 2 490-1512-1-ND CAP CER 10000PF 50V 10% X7R 0603 0.10 1 839-1036-ND CBL ASSY 3.5MM SLIM 6' 4C BLK 4.42 1 CP-2207-ND CABLE ASSY STR 3.5MM STEREO 6' 2.80 1 839-1037-ND CBL ASSY 2.5MM SLIM STEREO BLK 2.90 1 A014C-4-ND HEATSHRINK 1/4 IN X 4FT CLEAR 1.63

I also want to mention that I have found that I can connect my phone to my Baofeng for both audio in and audio out with a combination of standard audio cables (one 2.5mm-to-3.5mm adapter, a 3-conductor 3.5mm-to-RCA adapter, a 4-conductor 3.5mm-to-RCA adapter, and some RCA female-to-female adapters), but (I think) because I'm not actually converting from line level to mic level, it doesn't work as well as I'm sure John's circuit does.

johnboiles commented 10 years ago

Definitely recommend the Sparkfun tutorials for SMD. Don't be too afraid of SMD! The boards and SMD parts for this project are so cheap it won't break the bank to screw up a couple boards. But you're right; you will need a good solder station (I recommend Weller, but all the tools Sparkfun sells tend to be solid and a lot less expensive).

@mcsquared88 where are you located? I'm sure a hackerspace would be able to help.

Really interesting you were able to connect it directly. I tried that initially, but couldn't get the iPhone to recognize the BaoFeng as a microphone, so I didn't receive any audio from the BaoFeng.

mcsquared88 commented 10 years ago

I've got a Google Nexus 5 and it works OK. I also tried it with a Samsung Galaxy S3 but I had to use an app called "SoundAbout" to force the phone to act as if there was a headset with mic attached.

johnboiles commented 10 years ago

Ah makes sense! There's probably something similar for jailbroken iPhones, but it's nice to not have to install anything extra for stuff to work.

On Tue, Aug 5, 2014 at 8:52 PM, mcsquared88 notifications@github.com wrote:

I've got a Google Nexus 5 and it works OK. I also tried it with a Samsung Galaxy S3 but I had to use an app called "SoundAbout" to force the phone to act as if there was a headset with mic attached.

— Reply to this email directly or view it on GitHub https://github.com/johnboiles/BaofengUV5R-TRRS/issues/4#issuecomment-51290944 .