phone to 5.1 stereo, in a factory environment - Page 1
Forum section: electronics / beginners

author: izotchi
author_rank: Newbie
timestamp: October 16, 2016, 06:05:32 am
content: Hello,I'm looking for an IC to boots the signal from my phone to a Logitech 5.1 system at work.I have no idea where to start.Stereo is a must, other wise people will complain.thanks Josh

author: izotchi
author_rank: Newbie
timestamp: October 16, 2016, 06:22:22 am
content: Hey,Sorry. first time.Just need I signal booster from phone to stereo.Where to start. So many option.i have many of old wall adaptors so voltage isn't really a worry.I want to build this, because later I will change the trim pot to a ambient noise reaction circuit. (maybe)

author: Zero999
author_rank: Super Contributor
timestamp: October 16, 2016, 11:21:43 am
content: Why not get a bluetooth stereo? No cables or other voltage adaptors. Connect your phone to the stereo wirelessly.

author: meeder
author_rank: Regular Contributor
timestamp: October 16, 2016, 11:33:09 am
content: Simply plug the 3.5mm plug in your phone?

author: Audioguru
author_rank: Super Contributor
timestamp: October 17, 2016, 03:14:18 am
content: Logitech makes low cost, low quality and low power audio systems.When the output power of an amplifier reaches its maximum power then boosting the input will not boost the maximum power output. It will just make severe distortion.

author: izotchi
author_rank: Newbie
timestamp: October 17, 2016, 07:26:11 am
content: Thanks. I ll have a rethink.

author: Zero999
author_rank: Super Contributor
timestamp: October 17, 2016, 07:44:19 am
content: Quote from: Audioguru on October 17, 2016, 03:14:18 amOh yes, I didn't notice that the original posted wanted to amplify the signal before passing it to an existing amplifier. If it's not loud enough with the phone and amplifier volume controls set to full, then increasing the input signal voltage any more is certainly going to drive it into clipping and cause lots of distortion.

author: raphaeltube
author_rank: Contributor
timestamp: October 19, 2016, 07:11:17 am
content: Quote from: Hero999 on October 17, 2016, 07:44:19 amActually, it may work in some cases (though still might not be the best option).From my experience, some mobile devices have very low output compared to others, and often will not drive the amplifier to it's maximum.In this case, a pre-amp or 'booster' of some sort would do the trick.You might want to first experiment with a few different sources (different devices from different manufacturers).-R

author: raphaeltube
author_rank: Contributor
timestamp: October 19, 2016, 07:16:46 am
content: With regards to splitting the stereo to 5.1:The speakers may have this function built in.If not, and assuming they at least take care of mixing a signal for the sub-woofer, then it should be as easy as splitting the Left & Right signals to both Front & Surround (rear) inputs by litterally joining/connecting them together.We might be able to give more meaningful advice if you post a model number of the system.-R

author: stj
author_rank: Super Contributor
timestamp: October 19, 2016, 10:10:45 am
content: put a 32ohm resistor in the cable between each channel and ground.that may cause the phone to switch from "Line" to "headphone" mode and activate the amplifier.