EveryCircuit - 4-Channel Audio Mixer

11 years ago

Yes very simple and very current consuming. You need 4 very strong input signals

11 years ago

good

11 years ago

Well, nothing's perfect. In real commercial audio applications, audio gears do consume a lot of current. A single IC chip isn't enough to drive a speaker that's rated for 15W RMS, that's why you need cascading amplification to suit the load.

hurz

11 years ago

In real your little mixer would have an worste case input impendance of 13.333Ohm!

normhayashi

11 years ago

13.3Ohms is still normal for audio applications. Believe it or not, an input load below 500Ohms is considered low-impedance whereas input load 10KOhm and above is considered high-impedance. A microphone for singing is rated at 300-500ohms typical which produces about tenths of mV on its own, that's why karaoke systems have amplifiers which is made up of tons of cascaded op-amps, genius!

normhayashi

11 years ago

And believe me, in the audio industry a low impedance input load is considered the best for replicating high quality audio, because high impedance loads injects unwanted noise into the signal, and amplifying a high impedance input load is a nightmare!

hurz

11 years ago

And how to drive a 13Ohm input with a 500Ohm output?

normhayashi

11 years ago

Its up to you how you want to drive it.

hurz

11 years ago

Never mind, but why needs the world simplest mixer an OpAmp. Why not put 4 x 10Ohm resistor together and call it Mixer?

normhayashi

11 years ago

That's an idea, but you know what? You're taking things too seriously. If you don't give others here a chance to learn and instead decide to criticize other people's work then I suggest you piss off.

normhayashi

11 years ago

And you didn't even notice the Rf on the opamp - it doesn't matter what kind of value my Rin is! If I were to increase my Rin to match the source impedance I'd overdrive the signal.

rbrtkurtz

11 years ago

Just ignore him, @normhayasi. He's a troll.

hurz

11 years ago

I try to understand and discuss this, because its missing in your description. And right, this is an educational platform where users try to learn and if circuits shows off like yours its a good thing to have about a discusion. Don't take this personal, i am talking about your circuit, nothing else!

hurz

11 years ago

@rbrtkurtz, you are one of this nancy boy FB generation, who can not handle "dislike" we know that.

normhayashi

11 years ago

@hurz if you wanted a discussion, first of all you should've presented the solution of your disagreement and not troll off with annoying, uneducational questions. There's different ways to wire a circuit, it's all up to which one you prefer using in the end of the day.

hurz

11 years ago

Tell me why shall i give YOU a solution for your problem, because you are so kind to me? Anybody should see the disadvantages of your circuit. And again, we are talking about 6 resistors and an opamp, and not YOU, right?

normhayashi

11 years ago

Because you're a troll who thinks he's better than everyone else. You think you're the Albert Einstein or Nikolai Tesla of this community, go fuck yourself Du Weißen Schweine!

normhayashi

11 years ago

And what's up with the "YOU" emphasis? Look at your comments, you're basically attacking me just because you think that I'm a newbie who doesn't deserve building circuits just because you have a lack of respect for anyone at all. Stop being a nerd and start having a life, certainly if you were a very well-accomplished engineer in real life you wouldn't have been using this app to show to others how insecure you are with your knowledge.

hurz

11 years ago

Put your energy into: reading comments, redesign your circuits, update the headlines, being more kind and everything will be good. Dont be paranoid.

normhayashi

11 years ago

Look who's talking here. Who's being mean here in the first place? P/S: have you heard of the analogy of the garden hose and the fire post? Audio mixers are not used to power up heaters during the winter so why do I need to use my music instruments to drive my mixing board? Sure you can propose the idea of building audio mixers using only resistors to your nearest Behringer company (assuming you live in Germany, not Austria or Switzerland) and see if they'll make you their board member.