wireless headphone projects

[ashefr10]

Hello, I just bought two audio modules 433 mhz Aurel to enable the wireless connection from the headset to the detector. However I do not really know how to go about external components. it is not necessary that the transmitter goes to sleep. thank you to those who could help me to share this project.

[golfnut]

Its a matter of power Id guess. If the unit takes an appreciable amount of power and you don't have it available - you may need to power the unit and play a tone when you get a hit. The Rx would probably need to be on continuously. You could wake the Rx periodically to see if the Tx is on - but that's probably overkill. If the consumption is low and you know the capacity of you battery and you know your max detedcting time then its a matter of adding it up and seeing if the budget hangs. S

[ashefr10]

ok thank you, could you help me to adapt the inputs and outputs in preference to a pcb smd thanks

[golfnut]

post the specification sheet for you radios ..

[Funfinder]

You better look for wireless bluetooth headphone.

[kt315]

You better look for wireless bluetooth headphone.

NO BLUETOOTH. say you again again and again! bluetooth IS VERY SLOW - for metal detecting - because digital. close this matter funfinder if do not know!

[Mechanic]

Don't write off the bluetooth so soon, many bluetooth systems do have a noticeable delay, however there are some that don't. For instance the Detech Oxygen Audio bluetooth headphones are reported to have no noticeable delay as well as Ismael's "Little Ripper" (Minelabmods.com) wireless battery system is also reported as not having a delay. So they are out there, the challenge is to find a good cheap one that exhibits no noticeable delay. I see that ebay has lots to choose from. Its another one of those "on the to do list" things.

As for the wireless modules in the original post, looks like there is a bit more required to get those working, not just simply feeding in an audio signal.

Cheers Mick

[Carl-NC]

KT, Mechanic is right... while many Bluetooth headphones have too much lag, there are a few which don't. When White's wanted to make wireless headphones we evaluated (many years ago now) a lot of different off-the-shelf headphones and none of the Bluetooth were fast enough. Now some are. I don't know what the difference is, whether it is even hardware or software.

[Davor]

It was a DECT phone that ruined my miking session, but it may apply to Bluetooth as well - they are both TDD systems. Noise was bad. I'd go with simple FM.

[Skippy]

I assume these Aurel modules are designed for digital data, so making them work with analogue signals isn't going to be easy. Better to just buy off-the shelf equipment, the Tecknet Rapoo headphones are cheap and have no significant delay.

[ashefr10]

I bought the Rapoo H3070 is unusable on my cs6mx cspope, it captures the harmonic frequencies and restore the helmet. suddenly it's unusable.

[kt315]

did somebody use those 433mHz receiver trasmitter boards? http://www.aliexpress.com/item-img/R...970487479.html
seems very good for using, but I has not experience with its.

[Altra]

Yes, these are meant for digital remote control signals using On-Off Keying (OOK). The receiver has dc restoration and a comparator to square up the signal. Not good for audio. These also do not have channels so two units could interfere with each other.

This might be better? Not sure if there is any delay?

http://www.ebay.com/itm/2-4-GHz-8-CH...pUDWz7HL-gzUGA

add: Transmitter and receiver
http://www.ebay.com/itm/600M-2-4G-Wi...-/181579545408

[sinclairuser]

there was a thread here a while ago where 433mhz was used, he used off the shelf stuff too.
full pics and instructions were included, cant be that hard to find, if memory serves he was sending the analogue audio thru rf.
i have to say though as davor hinted simple fm is more than enough and no lag.
i did an experiment with a pair of fm radio head phones and a small fm rebroadcaster that i clipped to the stem (87.5 mhz), it was only a personal proof of concept, but it works well.
i had allways intended to build a custom transmitter to use on my md's but never got round to it.
so doing the same thing at 433mhz fm would be even better(smaller antennas, cleaner band and ready made transmit and receive modules the size of postage stamps)
since the phones are never more than a couple of feet away from the transmitter they can be super low power too.

[kt315]

perfect modules, Altra! thanks!

ZX Speccy User, i had searched the forum before but did find nothing useful.