Remember voltages are measured with reference to another point in the circuit. Normally we call this point ground and make a (big) assumption that it is at 0V. When you say that one line has +13.5V on it and the other has -13.5V on it, what are you measuring with respect to? Does your power supply also have a ground output point that you are measuring to?
The two wires do not have separate voltages of + and - 13.5. The voltage BETWEEN the two is 13.5 and depending how you flip them on your meter it reads as + or -.
You need TWO supplies, each 13.V between their 'hot' wire and ground.
The one of which you ground the '-' gives on the other wire +13.5 wrt ground, the one of which you ground the '+' gives you -13.5 wrt ground on the other wire. That is your bipolar supply which you need.
Jan
You need TWO supplies, each 13.V between their 'hot' wire and ground.
The one of which you ground the '-' gives on the other wire +13.5 wrt ground, the one of which you ground the '+' gives you -13.5 wrt ground on the other wire. That is your bipolar supply which you need.
Jan
Now I'm just even more confused. I thought you could use a DC supply, run the positive to v+, ground to chassis, and - to v- and that would effectively give you a + 13.5 v and a - 13.5v using the same supply. They are both + and - 13.5 w respect to ground.
You're saying in a stereo power amplifier with 2 balanced input channels, there are 4 power supplies inside that box running the 2 balancing circuits? So if the voltage used for a stereo amplifier is higher than that to run th balancing chips, then there would be 5 power supplies in the unit? Does that sound ridiculous?
You're saying in a stereo power amplifier with 2 balanced input channels, there are 4 power supplies inside that box running the 2 balancing circuits? So if the voltage used for a stereo amplifier is higher than that to run th balancing chips, then there would be 5 power supplies in the unit? Does that sound ridiculous?
OT, what is your power supply? Is it off-the-shelf lab supply, or is it what you built?
If you measure voltage between V+ and V= of your power supply, what do you read?
If you measure voltage between V+ and V= of your power supply, what do you read?
Who was I trying to be? I am a complete novice at electrical circuitry and know nearly nothing about electronic components and how they operate. I am trying my best, but you'll have to explain everything like I'm 5.
Doug, the power supply I am trying to use to power this circuit is a 13.5 v DC output supply I found at my family business that was an extra of the ones used for a job we did for a client. It measures 13.5 DC across the 2 outputs wires or -13.5 DC if you switch the test leads. The supplies were made for the customer and they supplied them to us to add a connector to the end of it.
You are supposed to have 2x13.5 = 27V across V+ and V- output of your power supply.
I think our old TROLL friend has just created a new FAKE identity.
Problem is he creates such bad Karma for real noobs and beginners nobody will answer *them* any more.
Despicable.
This is literally the first thread I have ever made on this forum. Think you have the wrong guy. I'm just trying to get a little help here I think I'm almost better off just trying to figure it out on my own if it's such a hassle for you folks on this site
Doug, on my chipamp psu board, the output is about 25 volts DC. Im using a dual 18vac transformer into it. Is there any way to use this power like tap off it somehow to properly power this balancing circuit? My dad said if it needed to be regulated, it would need a whole bunch of extra circuitry to do that and it would be easier just to use a second power supply that is the right voltage
I plan to make a stereo amplifier next for my studio monitors, this one is just a test to see if I can actually do it. I will be using even higher voltage for that one with a stereo lm 4780 kit from audiosector. That one will be dual 25vac. So about 35-36volts DC. I wish I knew how to use this power to power the balancing circuits but I haven't a clue
There are billions of people out there with billion different opinions. Some think answering to beginner question a hassle, some not. There will be no unanimity.
I have pretty much learned everything I know so far from building the chipamp, and I barely know how it even works. I now know some about transformers and how to make a full wave bridge to make DC. This whole balancing thing, like French to me. I only understand what a balanced signal on a cord is from music industry college. No clue how the driver and receivers actually work!
Getting dual 12.5V out of 25V is not impossible, but is not an easy task either.
I think easiest way might be using your dual 18vac transformer, and get 12.5vdc or 15vdc using voltage regulators.
Yeah, I would go with either LM7815/7915 or LM7818/7918 since INA134 can handle 36V and that would be less voltage to drop.
I just don't get why sonic is having such a hard time understanding the supply requirements for the INA134.
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Would it be easiest to just get a bipolar power supply like wall adapter that is within the voltage range of the chip and just hook both balancing circuits up to that on the stereo version? I'm just going to use those boards that I posted to make the actual circuits but I will still have the problem with supplying them in the end.
I have no clue how to make or use voltage regulators. My dad alluded to the fact that there's transistors and all kinds of stuff needed to make that happen. I just want the thing to work easily!
There are 4 balanced inputs shown in AN003. None use a transformer. The transformer when used was to convert an unbalanced output to a balanced output to interface with the balanced input.
Look through the other Jensen/Whitlock papers. Try W.Jung and D.Self for others.
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