Tuesday 10 May 2016

schematics - Making a Simple Audio Mixer


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.


Simple Audio Mixer



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.


No comments:

Post a Comment

arduino - Can I use TI's cc2541 BLE as micro controller to perform operations/ processing instead of ATmega328P AU to save cost?

I am using arduino pro mini (which contains Atmega328p AU ) along with cc2541(HM-10) to process and transfer data over BLE to smartphone. I...