Introduction: Cracking Open the Motorola HS820 Bluetooth Headset

Picture of Cracking Open the Motorola HS820 Bluetooth Headset

Many people have been repurposing bluetooth headsets for use in their projects.
http://www.grooveking.com/blog/2006/03/grooveking-geekout-make-your-old-brick.html
http://kamalot.blogspot.com/2005/09/nes-bluetooth-handset.html

Both radioshack and Amazon had the Motorola HS820 on sale for 30 dollars this week. I bought one, popped it open. I wrote this up to show how easy it is and why you shouldn't be afraid.

Step 1: Remove the Ear Hook and Screw

Picture of Remove the Ear Hook and Screw

First off, we need to remove a couple of things so we can get inide to the guts.

1) I'm not sure of the technical name, but I'm going to call it the ear hook as it hooks around your ear. It just pops right off if you give it a slight tug. It's supposed to pop off so you can change the orientation of the set. It turns out that I'm left earred.

2) After you remove the hook, then take out the screw. It's a hex screw but, I found a mini-flathead screwdriver that was able to fit perfectly.

Step 2: Pry the Top Off

Picture of Pry the Top Off

With a mini-flathead screwdeiver, you can pop off the lit with minmal effort. Be careful becasue there is an exposed circut board under there. If you use too much pressure, or insert the screwdriver too far in, you could scratch it.I pried from the front to the back beacuse there is a rubber/plastic protector with some give located over the microphone and could easily pop the scredriver in there.

Step 3: Free the Board

Picture of Free the Board

The board is tacked on each side with some cheapo glue. I was able to use a small flathead screwdriver to scrape away the glue on each side.

Step 4: Free Board and Remove Mic

Picture of Free Board and Remove Mic

Remove the board, but take care because the mic and speaker are glued on to the plastic base. After you have freed the board, you can pry away the rubber shield around the mic and then pry the mic.

Step 5: Free the Speaker

Picture of Free the Speaker

The speaker is held on with a lot more glue than the Mic. However, the speaker has a nice ridge that you can pry underneath to get a fair amount of leverage.

Step 6: Test to Make Sure Headset Still Functions

Picture of Test to Make Sure Headset Still Functions

I atttemped to make a call with the disassembled unit and it still functions. Woo hoo it does. Notice the placement of the led. this could come in handy when you re-appropriate the headset for one of your projects.

Comments

Vijeth002 (author)2016-01-07

It would be better if we use Bluetooth headsets instead of carrying mobile every place at home no need to check for mobile in dilemma about where i left my mobile oh God! thansk to blue tooth headsets latestone.com is the recent website where i ordered one bluetooth headset very cheaply

Vijeth002 (author)2016-01-07

It would be better if we use Bluetooth headsets instead of carrying mobile every place at home no need to check for mobile in dilemma about where i left my mobile oh God! thansk to blue tooth headsets latestone.com is the recent website where i ordered one bluetooth headset very cheaply

Thaikarl (author)2014-10-24

i opened an earlier model of one of these a few years ago, looking to see if i could replace the battery. when i did crack it open, there were two tiny tiny bits that flew away from the edges. there were circuit wires connected to the spots where the connector bits were, so i surmised that they were "anti-tampering" devices. if you open an older one, or maybe a modern one of a different make, go slowly, open over a white towel or cloth so you can see if any tiny bits fall out. the battery in mine was soldered to the circuit board, i couldn't find a replacement. but that was a few years ago.

stankdog (author)2009-09-05

would it be possible to hook this up to a regular speaker (6x9) say for a garage application. I hate the ear phone but would love to answer the phone. Let me know as I have several types of speakers left over from a wall of sound project! Thanks,

Nightshade (author)stankdog2014-01-06

you would have to use an amp to drive the larger speaker

kmdu59 (author)2013-07-19

usb runs on 5 volts that is plenty any usb charger that fits will work

rafaelfrequiao (author)2013-05-26

What's the output voltage from the genuine charger? I lost mine.
I often find 5V and 5,9V searching on Google.
Can I use USB to power my HS820?

mtdna (author)2011-06-11

How do you rewire the On/Off/Call switch for easy hacking? For example, how do you wire it to a separate push button?

It just looks like a little pad - do you tear it off?

Thanks!

beehard44 (author)mtdna2011-08-05

you desolder the switch and solder wires to the 2 pads

Thaikarl (author)2011-03-16

i opened an much earlier model of one of these motorala jobs. there were these two tiny tiny bits, along the edge of the seam on each side that flew away. i examined the thing carefully, and decided that those were "anti-hacking" bits. if you took the thing apart - i was trying to see if the battery could be replaced - the little bits would fly off, and when you put it back together, it wouldn't work

lopoff (author)2009-05-15

wow that took me 2 hours to try and get it open and fail .......... i envey you

mikebook (author)2009-04-12

You were actually dead on. It is an 'ear hook.' Sometimes technology companies name things exactly after their purpose... I never thought I'd see the day either :-D

airwalker20 (author)2009-02-09

hey, just found this headset and tried to charge it, but the led doesnt light up, and i opened it but couldnt find anything( in my unexisting experience ) wrong, ill try to charge it tonight and see if maybe the leds wrong, any suggestions on how to check if its still worth anything? by the way, great job

Makemeasandwich (author)2008-04-09

I checked this out because I've wanted to build a bluetooth headset for a radio transceiver for a while now. The idea is a 3-point network: transmitter, PTT button, and headset. Any resources y'all could share for making this work would be appreciated.

nim6 (author)Makemeasandwich2008-05-07

i'm sorry that i can't help you, but i gotta say, i'm really lking forward to seeing it come to life!

d1ndian (author)2008-03-14

i have a broken bluetooth,only mic wires are broken. i want to know how can i use it for making anything.

Yerboogieman (author)d1ndian2008-03-15

build a computer mic and theres an instructable for having a bluetooth for ipods

guided (author)2007-12-04

these headsets were on woot.com today 2 for 20 bucks. i plan on making bluetooth receiver for my handy for home/office use. with 2 of them i feel i'll have adequate room for experimentation. now...where to find an old telephone....

Boss_Sauce (author)2007-10-18

Excellent tear-down! I put a Jabra into an old AT&T handset (see the flickr set) but destroyed a second headset-- a Motorola-- trying to solder leads to its circuit board...:( Those components are tiny!

I just w00t!'d two Jabra BT350's (and ordered tiny conical solder tips too...;) and will do an Instructable on tearing it down _and_ soldering leads to a separate board to make it easier to hack onto/into other devices.

linpagla (author)2007-09-27

Another new idea! How about running some wires from the bluetooth headset to the line in of the PC, so as to be able to record the mobile conversation in PC? Any technical viewpoints on this?

infrared (author)2006-06-08

i tore apart a nokia hdw-2 to use to transmit audio to my bluetooth usb adapter. you have to be carefull with the mic voltage if you want to add a line in connector instead like i did but a resistor worked fine also the only way to get it apart is to break it cuz it is glued together where the plastic post join together

Myself (author)infrared2007-04-18

You should isolate your input with a series capacitor, possibly one in each lead, since the mic might not be referenced to ground. Remember that it's expecting a very small signal from the mic!

infrared (author)Myself2007-04-18

on the hdw-2 headset the mic has been decoupled on the board already with some smt caps. i would have liked to build my own line level circuit but not knowing the details of this headset..... it works great to send simple "voice" 1 channel audio but thats where this headset is limited

yousetmeonfire (author)2006-08-31

Is there any way to separate the microphone from the headset? I have a newer bluetooth headset that I don't use and want to see if I can separate them for a project!

binnie (author)yousetmeonfire2007-04-06

just simply desolder it:)

P_cal17 (author)2007-01-08

I was thinking of linking the speaker wires to a red white aux cable so that my cellphone would play mp3s through my stereo, any thought?

easement (author)P_cal172007-01-09

probably, but you may need to run it though a preamp before sending it to the stereo.

Nightshade (author)2006-11-25

Very cool ideas. I wonder if it woul be possible to put it into an Ipod. Tell everyone you just got back from Japan and it's a prototype. Thank you all for the great ideas.,

irritant#9 (author)2006-08-12

Flathead screwdriver = football bat

irritant#9 (author)2006-08-12

At least you are done with that flathead screw driver.

irritant#9 (author)2006-08-12

Flathead is not a screwdriver type. Flathead is a screw head profile: in the case of the screw shown above, It most likely is a oval or pan head torx.

wdejong (author)2006-06-29

I just got a couple of those Star Trek communicator garage door openers....yeah, I'm making myself a real communicator

Crash2108 (author)2006-06-18

What will we use that for? I am thinking RC car or something, but how would I actually control it?

radiorental (author)2006-06-15

got one after reading this. Planning on putting it in to a tradition handset for a more intuitive feeling skype phone call. Problem: my imac at work loves it, my powerbook at home 'does not support headsets' wtf! any idea?

sbusUltra (author)2006-06-13

Thats actually a torx screw. Its a six pointed star, not a hexagon. Good howto though.

remarc solo (author)2006-06-11

Ylim is right if you are trying to send a lot of data. However to transcieve at say 1200 baud attach either a modem, or implement one using a function in a $5 dsp or microcontroller. (Should use about 10% of the CPU). If a hundred people want it I'll show you how and get the kit.

ylim (author)2006-06-10

Interfacing bluetooth is seriously tedious, perhaps because of the tight requirement of synchronizing the hopping sequence. It is pretty amazing how the bluetooth is selling that much. The point that I am driving is without a proper datasheet, I guess this module is nothing much of a value in serious work.

usbrit (author)2006-06-08

BTW these are pretty hardwearing units, mine has been through the washing machine (left in a pocket, not on purpose!) and survived after drying it out in the sun for a few hours.

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