I'd like to make a simple audio mixer that takes in line level signals from various mp3 players, computers, etc. I found a simple schematic online, but I'm wondering if this will be okay for my purposes. Do I need some sort of DC blocking in this circuit? I just want to ensure this won't damage any components I plug into it.
Answer
That will probably work well enough. Most devices are going to output a average level of 0, and 4.7 kΩ is high enough that I don't think any device will have trouble with it. This method will allow the other signals to back drive each output a bit, but at 4.7 kΩ that is unlikely to be a problem.
For extra security, you could put 2 µF caps in series with each resistor to guarantee DC blocking. 2 µF and 4.7 kΩ have a high pass rolloff frequency of 17 Hz, so won't cut into your audio.
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