My question is how to make a breadboard for a 2 battery Automatic Charging Switch?
I want to power a small audio device with a "permanent" 2 battery configuration. I will have the battery charger (should charge a 7.2 Volts Li-ion battery) to switch between the 2 batteries:
The charged one to power my audio device.
The discharged to be recharged.
I want to make sure that the charger is not sending any signals whatsoever to the battery who's powering my audio device when used to charge the other battery.
I would be very happy to put this on a breadboard! I just know what I want to do, I don't know how to do it... Help highly appreciated!
Why?
I mean what do you hope to achieve by switching between 2 batteries as you describe, it seems pointless to me but perhaps there's something important I'm missing.
I was wondering the same thing. Perhaps he wants to keep any noise from the charger out of the audio signal. I think that would pretty much be the only reason that might make sense.
Streamers needs galvanic isolation to remove all noise from the grid and from the network (ethernet). I made a media converter from ethernet to optic to feed my music streamer. But to ensure that I am not sending noise, I need to power it up with battery and I don't want the batteries to catch noise from the charging process.
If possible I make it as a PCB! This is my new project after 7 years of absence. My last project was a tad too advanced for me. I almost managed to complete it, made many prototypes but then I have been left with no time for that. So I am back with a quite easy project. Let see where it leads me!
Do they?
I'm not saying you are wrong because I don't know, but it seems unlikely to me.
The only way to get galvanic isolation between your charging and discharging batteries, other than manually swapping them, is to use a double pole relay.
Streamers or a DACs or Streamers DAC with galvanic isolation and fiber optic connection cost $1000 to $2000 more than the ones who don't. When you spend big $$$ to get the cleanest source as possible down to your pre-amplifier, the easiest mistake you can make is to overlook how you power your media-converter (for my case). I want to remove all potential noise from my signal path, but I still need to isolate my media converter. Double pole relay yes, when one is one one is off. Seems down straight simple to me, good enough. And I can still get the V values of the batteries to get it automated without getting noise. This is the direction I will go with.
Is the signal you are dealing with at any point analogue? If not then there's no point as digital circuits are noise immune by their very nature, you only have to consider bit error rates.
I know I'm off topic, I can stop here if this isn't helping you.
Relays you will have to be careful about switching noise and power for the relay and where you place the flyback diode (next to the device that switches the relay, NOT next to the relay. OK, so if the relay and the device switching it are next to each other then this isn't something to consider.)
As one battery will be fully charged and the other drained they won't be at the same voltage, you have to deal with this. I suggest a big capacitor across the load and make sure that at no time, not even for a millisecond, are both batteries connected to the load.
Ethernet transport distortion exist, it is a multi layer signal and yes one part is 1 an 0 but only one part and it gets complex when it is used to stream music since music requires enormous amount of data, is coded, decoded, compressed and decompressed. Since my Streamer does not have fiber imput I told myself I better to try myself and see if this isolation from the ethernet noise is real or snake oil. So I made my own. And now, you can see on the picture, my battery can not last overnight. So I want to have a way to charge 2 but when 1 is charging the other one is used. This way I realy don't catch noise from nowhere. My wife asked me what I did when she heard the change on my system.
In general terms the first thing to be concerned about with data is bit errors. UDP sits on top of Ethernet and does not correct for errors and is prone to missing or duplicated packets. If you use UDP then you have to account for this yourself. TCP sits on top of UDP and has mechanisms for dealing with errors and missing or duplicate packets, but those mechanisms come at a cost, which is extra data and extra latency and jitter.
If the system you are building is adding to errors or packet loss then there is something wrong with the design. You should not need to power it from a battery to combat typical data loss or corruption problems with internet data. HiFi music systems are capable of very high quality sound while using mains power, and they are analogue, which is much more noise sensitive. In my opinion you are either fixing a problem you don't have, or if you do have it you are using the wrong approach.
Music requires enormous amount of data
'Enormous' is not a standard measure for data. All that matters is you have more than sufficient capacity for the actual amount of data your are streaming. Using batteries for power isn't going to make any difference to this.
If I'm mistaken do please correct me but but keep in mind I'm trying to keep it simple for the OP, not wander off too deeply into the working of UDP and TCP. I might have gone too far already.
@cyrille001 ,
Is this helpful or not? If not I'll stop here.
Perry, I do this for fun, the audio world is full of not (yet for some) scientifically proven "solutions" or "upgrades". One of them sold in many different flavours. By analogy, the Grall of Audiophiles is to get your system to a level that you feel musicians are in your room (when the original recording allows for it... meaning not all the time). Some can consider audiophiles the same way as the tech nerds fine tuning and fine tunning and fine tunning their system until they reach the Grall...
Audio files are definitely digital and needs to be translated to Analogue and sent down to pre-amplifier and amplifier. One of the upgrade offered by high end to very high end manufacturer of Streamers and DAC's is to have Ethernet to Fiber connection, this option if you want add cost $1000 to $2000. So I decided to try by myself to add the Ethernet to Fiber connection powered by battery. So far all people who listened to my little gimmick felt the improvement of the sound quality. It appears that it did reduce the SNR signal to noise ratio. This is not scientific, it is just hobby matching. For the last 7 years I did not do anything on the electronic side. For couple of $$$ I setup a little "filter" who's I believe make me save swapping for an ultra expensive Streamer.
