Electronics Infoline Web

IR Controlled Mixer

Our main floor consists of three large rooms which do not have any doors between them. The livingroom, middle room and the kitchen are all one large space. Each of these rooms has a set of speakers, and all the speaker wiring runs to a 6 channel Rotel amplifier in the livingroom. Because of the open concept, it is only practical to listen to one music stream at a time on the main floor.

http://www.andrewkilpatrick.org/mind/ir_mixer/

Stereo Mixer

With this circuit you can mix four separate audio inputs. Each input will accept high or low impedance microphones, phonograph, tape or aux signals. You can adjust the gain of each input by adjusting each respective pot.

http://home.maine.rr.com/randylinscott/may20.htm

6 Input Mixer

The mixer circuit below has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones.

http://www.mitedu.freeserve.co.uk/Circuits/Audio/6ipmix.htm

Stereo Audio Isolator

This circuit is useful for removing ground loop hum on a remote line level audio signal line. It can be used to to connect a computer sound card to a stereo amplifier line input.

http://www.solorb.com/elect/musiccirc/stereoiso/index.html

Synthetic Isolators

Great for checking the SWR of antennas.

http://www.wenzel.com/documents/circtran.htm

Analogue Opto Isolator

use a standard, low quality opto isolator to transfer an analogue signal with reasonable linearity and without complicated feedback loops to monitor and linearise it.

http://www.4qdtec.com/aoi.html