standalone bi-directional stereo audio transceiver without bluetooth - Page 1
Forum section: electronics / rf-microwave

author: kosta
author_rank: Newbie
timestamp: February 06, 2021, 01:50:31 pm
content: Hi,I've been looking for years for a very simple device but never found one. It should allow for stereo audio to wirelessly transmit at CD quality between 2 boxes.Each box should be standalone, small and battery powered and must have two 3.5mm stereo sockets, one input and one output. The range is the important part, because it must be much better than bluetooth (and more stable). Standard 2.4GHz wireless headset range is ok, old FM range would be even better. 30m indoors at least.There are countless options, most really cheap, that do something like this one way and by now almost all bluetooth.An example of what it could look like ishttps://www.ebay.com/itm/402466381745One problem with this one is that it probably does not connect to another similar box, but needs a phone or computer. And it's bluetooth. And it would only work one-way.Accidentally I may have found THE solution herehttps://www.ti.com/lit/ug/swru281/swru281.pdfThe Texas Instruments CC85XXDK-HEADSET-RD.Unfortunately it is no longer available and TI doesn't even have a successor. Everything is BT now with them, therefore not comparable.Does anyone have a source for this old kit or something comparable? I actually don't have the knowledge to design something from scratch.Thanks for any pointers!

author: themadhippy
author_rank: Super Contributor
timestamp: February 06, 2021, 03:12:05 pm
content: Been doing that for years with radio mics and in ear monitors,although its a 2 box solution and not cheep if you want quality

author: kosta
author_rank: Newbie
timestamp: February 06, 2021, 06:47:24 pm
content: Yes, I also looked into that area and once found almost a solution, don't remember why I didn't try it. Maybe it was too big as those stage things tend to be.And buying two products that do one-way also came to mind, but it gets pretty big rather quick with batteries etc.It all should fit in a few cm². Maybe I should develop something, maybe I can sell it.

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 07, 2021, 04:52:41 am
content: Perhaps something based on ESP8266 or ESP32 to create a P2P Wifi link? I suppose a pair of Raspberry Pi would work too and be easier to program at a high level, but with more latency and slower boot time.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: February 07, 2021, 04:45:51 pm
content: You can get a $13 chip and a corresponding $150 eval kit:https://www.silabs.com/audio-and-radio/fm-radios/si472x-fm-radio-transceivershttps://www.mouser.com/ProductDetail/Silicon-Labs/SI4721-B20-GM/?qs=JiL6vA75y8PE214vQdHGxQ==https://www.silabs.com/development-tools/audio-and-radio/si472x-evaluation-kithttps://www.digikey.com/en/products/detail/silicon-laboratories-inc/SI4721-B-EVB/2277981?utm_adgroup=RF%20Evaluation%20and%20Development%20Kits%2C%20Boards&utm_source=bing&utm_medium=cpc&utm_campaign=Shopping_Product_RF%2FIF%20and%20RFID&utm_term=&utm_content=RF%20Evaluation%20and%20Development%20Kits%2C%20Boards&utm_id=bi_cmp-274517354_adg-1305120525217465_ad-81570081365825_pla-4585169650565091_dev-c_ext-_prd-2277981&msclkid=8abea26ed1af13c30b10c24ec8674557