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M70 & M90 with hardwired bluetooth module mod.


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#211 Okelly

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Posted 19 September 2015 - 08:37 AM

^ I believe it's about keeping the integrity of the box but updating to be used with today's technology. I personally would love to have all my boxes setup with Bluetooth and have them look factory because I don't see myself making tons of cassettes of new music just to use the box. The phone I carry on my pocket has unlimited music.

#212 trippy1313

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Posted 19 September 2015 - 10:53 AM

I have one question, why do you guys spend so much money on BT mods when you can get BT receiver ~2$ and dc-dc converter ~2$?

BT audio receiver: http://www.aliexpres..._74_75,201409_3

DC-DC step down converter: http://www.aliexpres..._74_75,201409_3


I've thought of doing something like this, but then blu_fuz found a module with a range of over 100ft.

Well worth it. I was using a normal one with a range of 30ft max, it's fine inside, but completely useless outside.

#213 stosoorok

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Posted 19 September 2015 - 12:08 PM

I've thought of doing something like this, but then blu_fuz found a module with a range of over 100ft.

Well worth it. I was using a normal one with a range of 30ft max, it's fine inside, but completely useless outside.

Okay sounds good, I have to test this 2$ receivers range. Btw, you can add a small wifi antenna with pigtail to this cheap receiver! (soldering skills needed of course)

 

Antenna with pigtail: http://www.aliexpres..._74_75,201409_3



#214 blu_fuz

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Posted 08 October 2015 - 09:54 PM

Did another BT home stereo mod tonight. Super easy and nice clean audio with no feedback.


Attached File  image.jpg   108.33K   9 downloads

#215 trippy1313

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Posted 08 October 2015 - 11:40 PM

No feedback is good. Anything different about this setup? Other than different device of course?

I'm curious if it's a matter of the overall ground quality throughout the device itself.

#216 blu_fuz

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Posted 09 October 2015 - 05:58 AM

I'm also not soldering the rca cables to the board, just plugging them into the aux-in rca jacks.

#217 Cpl-Chronic

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Posted 16 October 2015 - 02:48 PM

OK.  This might be a long shot but try using shielding foil or metal box to protect the BT module from the RF being thrown around inside the cabinet.  I had to magnetically shield the areas around the pre-amp controls on Vintage Man's Prosonic LED MOD.  The PWM regualtors would create RF spikes, at each LED & would shunt across the controls introducing static & noise.  I shielded those areas with ground & the noise went away.  I'm wondering if the BT modules don't shield themselves to RF interference because of FCC rules or something...

 

Worth a try.  You have to use copper foil or a metal box that is grounded to effectively shunt any RF before it reaches the module since you've buried it inside a 30 year old box that has a real transformer & rectifier, vs all silicon power regulation...controls & circuits that are not shielded well, etc.  put a metal enclosure of some kind around the module & then ground the metal enclosure to the ground screw of the blaster.  BAM!!  Should work if that is the culprit.



#218 jimmyjimmy19702010

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Posted 16 October 2015 - 04:44 PM

Wouldn't a shield also block the reception of the antenna?

#219 Cpl-Chronic

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Posted 16 October 2015 - 10:13 PM

Wouldn't a shield also block the reception of the antenna?

good point....



#220 DarksideWill

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Posted 23 October 2015 - 04:57 PM

Now the BT magic money shots!
attachicon.gifimage.jpgattachicon.gifimage.jpgattachicon.gifimage.jpgattachicon.gifimage.jpgattachicon.gifimage.jpgattachicon.gifimage.jpgattachicon.gifimage.jpgattachicon.gifimage.jpgattachicon.gifimage.jpg


You did a great job and I am loving it! And the Blue LEDs are such a sweet touch!

#221 blu_fuz

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Posted 24 October 2015 - 02:11 AM

Thanks bud! A simple addition that makes a world of difference.

#222 Ayalamj1

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Posted 06 January 2016 - 11:54 PM

Lol I googled it as well and is strange maybe they was trying to hide its name but put a z on it spelling zoxadon and it comes with the description for delusional lol maybe a party pill back in the days.

#223 blu_fuz

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Posted 07 January 2016 - 12:00 AM

Oh man that's great!

#224 trippy1313

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Posted 08 January 2016 - 02:10 AM

Bring them to Vegas! Haha

#225 HRmeteohub

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Posted 24 June 2017 - 11:43 PM

^ I believe it's about keeping the integrity of the box but updating to be used with today's technology. I personally would love to have all my boxes setup with Bluetooth and have them look factory because I don't see myself making tons of cassettes of new music just to use the box. The phone I carry on my pocket has unlimited music.

I second that.

Although the blue LEDs can look nice, they can also scream: " I was different!", or perhaps:" I am Frankestein!".

Somehow I do like the incadescent lights, and I tend to replace the bulbs or if not possible, put similar LEDs instead.

While we are at it, that is a nice looking boombox!

 

What are your thoughts about SD card MP3 players with remote controls or RaspberryPi based media players (WiFi connected and probably wth remote control or touch screen)? I mean, when in Rome... why not go all the way?



#226 HRmeteohub

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Posted 26 June 2017 - 08:08 AM

Reading this thread it seems to me that people do not know that it matters a lot what kind of BT dongle they use. There is rather good text on Wikipedia. Specifically, the range depends a lot on what version of BT standard is used. Range alone goes from 10 m to 240m (33 ft to 800ft).

 

So, If you do not need 100 m /330 ft, go for $2 BT v2.0+EDR and it will do fine. Of course that v3.0 or v4.0 will work better...



#227 Dancorp

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Posted 16 November 2017 - 05:42 PM

Just a message to M70 owners 

Check out that : https://boomboxery.c...for-m70-wip-94/



#228 dan

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Posted 20 May 2019 - 03:54 PM

ordered a couple of these: VHM-314

 

https://www.aliexpre...2945255089.html

 

pretty tiny. 30mmx30mm (about an inch by an inch)

 

Attached File  bt.png   385.39K   2 downloads

 

gonna add one to a M70 when it arrives.

 

 



#229 trippy1313

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Posted 30 May 2019 - 11:15 PM

Let us know how well it works, and take pics and details of the install!

#230 dan

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Posted 08 June 2019 - 07:56 AM

Let us know how well it works, and take pics and details of the install!

 

 

well, i installed the BT module and it works but i'm getting high frequency noises after the bluetooth module connects.  don't think it's a ground loop, positioning of the module or routing of audio wires. everything is fine when the unit is powered off a power source that doesn't come from within the radio such as a battery or usb charger connected to the wall outlet. i'm powering the unit off the X505 power rail via the the lamp power line with a 5 volt LDO regulator. the regulator isn't causing the noise either. it seems like high frequency switching noises are coming from within the BT module and feeding back through the BT module's power connection and into the M70. it's annoying if you have the volume cranked up with no audio signal. the noise is also present on other input selections if the BT module is powered on.



i wonder if this would help with the noise. it is a DC to DC isolation module:

 

B0505S-1W

 

https://www.mornsun-.../pdf/B_D-1W.pdf

 

https://www.ebay.ca/...872.m2749.l2649

 

provides 200mA of current max. must have a load of at least 20mA to operate correctly. some passive components required, 4.7uf cap on input and 10uf cap on output. it has a max capacitive load of 220uF. my bluetooth module has 2 100uF caps on it plus all the other nF caps. i wonder if it would be pushing it close to the operating tolerances.

 

here are some different units from digikey:

 

https://www.digikey....1206-ND/2256386 50mA out

 

 

https://www.digikey....49-5-ND/2315051 100mA out

 

 

https://www.digikey....3159-ND/8550767 200mA out

 

 

these can operate with a capacitive load of 470uF max.



#231 trippy1313

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Posted 08 June 2019 - 10:02 AM

Did you take pics of the install? What I've found with the module I used was to use the ground for the module but don't connect the negative side of the audio outputs. With the module I used, the shared the same ground, so connecting the audio ground made the loop noise.

I think I also found to connect to module ground to the main chassis board ground on the radio, if that makes sense.


Also, test out the range, let us know what kind of connectivity distance you get.

#232 dan

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Posted 09 June 2019 - 08:10 AM

Did you take pics of the install? What I've found with the module I used was to use the ground for the module but don't connect the negative side of the audio outputs. With the module I used, the shared the same ground, so connecting the audio ground made the loop noise.

I think I also found to connect to module ground to the main chassis board ground on the radio, if that makes sense.


Also, test out the range, let us know what kind of connectivity distance you get.

 

 

i took some pictures and will post when i finish. i tried disconnecting the audio ground but it didn't help. i don't know why there would be a ground loop. usually that happens if the grounds are not at similar potential. the ground for my audio and the ground for the BT module have no resistance between them so they should be at the same potential, unless the BT module is doing something inside its self that is causing a difference. the module can either be powered from the unit with audio disconnected or powered externally with the audio connected.  power from the unit and connect the audio and weirdness happens, you hear those digital switching noises. i'm gonna get those DC to DC isolators from digikey  and power the BT module through that and see what happens. i'd rather go that route than use a ground loop isolator on the audio because those things tend to affect the sound, they tend to kill the bass is my experience. the DC to DC isolator is smaller and cheaper and hopefully provides galvanic isolation which should eliminate any loop issues or interference feeding back through the power lines from the BT module. it should essentially be the same as running the BT module from a separate battery.

 

p.s, i ordered xy-bt-mini modules from a place, i blew those in my experimentation and ordered another 5 from the same guy. they arrived the other day and i received hw-770 modules which look exactly the same. the only problem is that the hw-770 have a heavily chinese accented english language voice instead of the tones on the xy-bt-mini.  i prefer tones over people talking.

 

i gotta see if they have any BT modules that are made in italy. i wouldn't mind super mario telling me my blue a tootha is a now a connected. ;)



p.s, on the BT module, i measured resistance between the negative power terminal, audio ground and the pcb antenna and there is no resistance between these points. i wonder if this is the issue. if the antenna is connected to the ground, then the BT signal would feed back through the power ground and audio ground. if the BT module is powered by an external source, the BT signal would be part of a different electrical circuit and wouldn't feed into the M70.



#233 dan

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Posted 11 June 2019 - 11:43 AM

UPDATE: 6/11/19

 

success! the dc to dc isolator works. no more RF signal noise. the sound quality is also excellent now.  it seems like range is also a bit better.

 

the isolator adds around 35-40mA current usage to the circuit.  i think it has a quiescent current of about 20mA and is around 70%-80% efficient.  my lighting and BT use around 110mA when everything is on. it's all on a 250mA fuse just in case something goes nuts it won't take out my x505 rail.



#234 Fatdog

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Posted 11 June 2019 - 12:55 PM

:rock: :rock: :thumbsup:



#235 dan

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Posted 11 June 2019 - 01:20 PM

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#236 blu_fuz

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Posted 11 June 2019 - 02:03 PM

Got it all figured out? Looks like a nice install.



#237 dan

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Posted 12 June 2019 - 06:02 AM

thanks man. learned a lot of stuff along the way.



#238 trippy1313

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Posted 11 July 2019 - 12:29 AM

Did you get a chance to test the range and quality of this newer module?

I'm curious if the BT 5.0 range is really as good as its supposed to be. Supposedly around 150-200 feet I think.

#239 jimmyjimmy19702010

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Posted 11 July 2019 - 01:29 AM

Did you get a chance to test the range and quality of this newer module?
I'm curious if the BT 5.0 range is really as good as its supposed to be. Supposedly around 150-200 feet I think.

Are there phones/MP3 players that are BT 5.0 compatible? I know the iPhones are still 4.2

#240 trippy1313

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Posted 11 July 2019 - 07:32 PM

My Samsung S8 is 5.0. I think I read somewhere the S8 was the first phone with bt5.0 so I'd assume some newer phones are as well. My S8 is two years old.


Edit: I thought I had a link to my 920 BT install here for reference, if that's okay I'm adding it here in case it can help alongside this thread.

http://boomboxery.co...l/?fromsearch=1