Correct! I found the same thing when testing a Bluetooth module on my DIY boxes - hooked up direct with a 12V SLA battery - perfectly quiet - no noise!blu_fuz said:
Sorry Fuz can't help you on the filtering issue though.
James....
M70 & M90 with hardwired bluetooth module mod.
- Thread starter blu_fuz
- Start date
Sorry Fuz can't help you on the filtering issue though.
James....
I'm trying to read up on ground loop issues and other noises in 12v BT systems. Here is a good read but no solution:
http://www.instructables.com/answers/Battery-run-bluetooth-class-d-amp-help-me-fix-th/
Maybe something as simple as a CAR AUDIO RCA NOISE FILTER SUPPRESSOR ISOLATION TRANSFORMER might help:
http://www.ebay.com/itm/Q-POWER-NF2-15-AMP-CAR-AUDIO-RCA-NOISE-FILTER-SUPPRESSOR-ISOLATION-TRANSFORMER-/141510263122?nma=true&si=kfB2hQSPd9ZeKeC1JafevdGrUvc%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
Styngers version:
http://www.amazon.com/Stinger-SGN20-Ground-Loop-Isolator/dp/B002ZRQ3PW/ref=dp_cp_ob_e_title_2
Also saw this noise reduction thing on epay:
http://www.ebay.com/itm/12V-Noise-Reduction-Module-BA3121-Noise-Filter-Board-for-Car-Bluetooth-Amplifier-/171305407532
Good info here too:
http://electronics.stackexchange.com/questions/148891/ground-loop-noise-from-12v-to-5v-converter-manifest-in-bluetooth-audio-source
http://www.instructables.com/answers/Battery-run-bluetooth-class-d-amp-help-me-fix-th/
Maybe something as simple as a CAR AUDIO RCA NOISE FILTER SUPPRESSOR ISOLATION TRANSFORMER might help:
http://www.ebay.com/itm/Q-POWER-NF2-15-AMP-CAR-AUDIO-RCA-NOISE-FILTER-SUPPRESSOR-ISOLATION-TRANSFORMER-/141510263122?nma=true&si=kfB2hQSPd9ZeKeC1JafevdGrUvc%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
Styngers version:
http://www.amazon.com/Stinger-SGN20-Ground-Loop-Isolator/dp/B002ZRQ3PW/ref=dp_cp_ob_e_title_2
Also saw this noise reduction thing on epay:
http://www.ebay.com/itm/12V-Noise-Reduction-Module-BA3121-Noise-Filter-Board-for-Car-Bluetooth-Amplifier-/171305407532
Good info here too:
http://electronics.stackexchange.com/questions/148891/ground-loop-noise-from-12v-to-5v-converter-manifest-in-bluetooth-audio-source
Sel The Don
Member (SA)
I had the same issue oi noise when working on one of these Japanese Pachislo machines, I'd get some horrible noise. I bought myself a ground loop isolator and the hum disappeared.
http://www.amazon.com/BOSS-Audio-B25N-Ground-Isolator/dp/B000LP4RMG/ref=pd_sim_263_1?ie=UTF8&refRID=0HSW4KVR3QBEXWW6TRNW
http://www.amazon.com/BOSS-Audio-B25N-Ground-Isolator/dp/B000LP4RMG/ref=pd_sim_263_1?ie=UTF8&refRID=0HSW4KVR3QBEXWW6TRNW
trippy1313
Member (SA)
You ever figure out your hum issue?
Also did you ever buy/use whatever switches you were looking at on eBay?
Also did you ever buy/use whatever switches you were looking at on eBay?
trippy1313
Member (SA)
But she's my world 
.
Lasonic TRC-920
Moderator
To add a little something to this blue tooth thread...
If you read my thread about blue toothing my Lasonic TRC-920 HERE then you saw I used the same module as Joe. In fact, I bought it from him (thank you for that buddy)
In the Lasonic I was able to simply use the factory power switch to turn on the BT module. The only issue with that is, the BT module is on when ever the radio is on. So if that's something you do not want, then you may want to put in a separate switch just for it.
The mechanical switch on the Lasonic is very hardy. It also features unused pins for which to solder the BT power wire too.
The BT module only has four wires on it. Power, Ground & Left/Right music input.
On the Lasonic, I did not have to remove the main board to access the section of the board where the RCA's attach inside (just inside where the RCA's are on the outside of the box)
I simply soldered a wire to the ground and left / right channels on the "Line In" section of the main board. I used an old RCA jack I cut out of a parts 920 I had, but you can buy RCA connectors online. I then soldered my right / left and ground to those salvaged RCA's which allowed me to simply plug the BT module RCA's in.
I soldered the ground wire to the NEGATIVE wire of the battery block.
The POSITIVE with went to the power switch. Using a multi meter, I checked all the posts on the power switch while it was turned off, to see what had power and what did not. Then I turned the power on and checked again. I located a pin that was dead when off and had power when on making sure it was 12v. I soldered to that.
That was it.
It literally took me 15 minutes to do it all.
One more thing to add...
I have done 10 or so BT mods to various radios. I have used multiple BT modules as well as used BT ear buds and BT in a few different cars. Of all of the BT systems I have used, this particular one connects faster that any I have ever seen. It is flawless.
The little tiny ones I use that I take from radio to radio are always hit and miss. Sometimes they connect automatically, but most of the time I have to do it manually.
With this one, I push the power button and by the time I open my music player app, it is connected. No joke, just seconds. Fantastic system.
If you have always wanted to BT a radio, I recommend this system.
Thanks again Joe!
If you read my thread about blue toothing my Lasonic TRC-920 HERE then you saw I used the same module as Joe. In fact, I bought it from him (thank you for that buddy)
In the Lasonic I was able to simply use the factory power switch to turn on the BT module. The only issue with that is, the BT module is on when ever the radio is on. So if that's something you do not want, then you may want to put in a separate switch just for it.
The mechanical switch on the Lasonic is very hardy. It also features unused pins for which to solder the BT power wire too.
The BT module only has four wires on it. Power, Ground & Left/Right music input.
On the Lasonic, I did not have to remove the main board to access the section of the board where the RCA's attach inside (just inside where the RCA's are on the outside of the box)
I simply soldered a wire to the ground and left / right channels on the "Line In" section of the main board. I used an old RCA jack I cut out of a parts 920 I had, but you can buy RCA connectors online. I then soldered my right / left and ground to those salvaged RCA's which allowed me to simply plug the BT module RCA's in.
I soldered the ground wire to the NEGATIVE wire of the battery block.
The POSITIVE with went to the power switch. Using a multi meter, I checked all the posts on the power switch while it was turned off, to see what had power and what did not. Then I turned the power on and checked again. I located a pin that was dead when off and had power when on making sure it was 12v. I soldered to that.
That was it.
It literally took me 15 minutes to do it all.
One more thing to add...
I have done 10 or so BT mods to various radios. I have used multiple BT modules as well as used BT ear buds and BT in a few different cars. Of all of the BT systems I have used, this particular one connects faster that any I have ever seen. It is flawless.
The little tiny ones I use that I take from radio to radio are always hit and miss. Sometimes they connect automatically, but most of the time I have to do it manually.
With this one, I push the power button and by the time I open my music player app, it is connected. No joke, just seconds. Fantastic system.
If you have always wanted to BT a radio, I recommend this system.
Thanks again Joe!
I concur. I bought the same module from Joe and it's simply the best I've ever used. Super fast and reliable connection every time - much faster than the bluetooth connection in my Renault and Toyota!Lasonic TRC-920 said:
James....
Lasonic TRC-920
Moderator
Wild man....I have never seen any BT connect as fast.jimmyjimmy19702010 said:I concur. I bought the same module from Joe and it's simply the best I've ever used. Super fast and reliable connection every time - much faster than the bluetooth connection in my Renault and Toyota!
James....
Hat's off to the engineer on this one!
trippy1313
Member (SA)
So I bought four of these a while ago after you first posted it's range, and just recently I started playing with them.blu_fuz said:
I wanted to see what was powering this, (since there are no specs anywhere) so I removed the heatshrink.
It is a CSR8635 module. Their website says it's actually BT 4.1, which may be why it's so impressive. I'm not sure about the board it's mounted to, can find an info on it, or how it has such fantastic range but its actually got a blue powe light Here's the site and some pics.
http://www.csr.com/products/csr8635
Attachments
So cool you opened that hard shrink case up. I can't believe they bury the LED under the shrink case, I would love to actually see it.
It's very strange that it looks to be made pretty cheap, far cheaper looking than BT #3 from Sure Electronics.
The range saves the day on this beast, makes me giggle a little bit every time I connect BT from 60+ feet away
It's very strange that it looks to be made pretty cheap, far cheaper looking than BT #3 from Sure Electronics.
The range saves the day on this beast, makes me giggle a little bit every time I connect BT from 60+ feet away
trippy1313
Member (SA)
It's pretty cool. I've been testing them at work, a concrete building full of cars, and it still works up to about 100 feet away, in my pocket!
trippy1313
Member (SA)
Lol. They're selling them again it looks like.
http://pages.ebay.com/link/?nav=item.view&id=351186481167&alt=web
http://pages.ebay.com/link/?nav=item.view&id=351186481167&alt=web
trippy1313
Member (SA)
I haven't installed one in a box yet, just externally. Hoping to soon. Will update when I do.blu_fuz said:
