| Stereo Panner |
| Stereo panning is being able to take an audio signal and manipulating it so that the sound pans from the left channel to the right channel of a stereo system. If you were to listen to this through a pair of headphones you would hear the sound moving from your left ear to your right ear and back again. This circuit can get a little big so you may wish to build this in a separate project box that your electronic instrument can plug into - rather than installing it directly into your electronic instrument. |
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| Basically, the stereo panner circuit is just a modification of the tremolo circuit wherein you will be using two alternating vactrols instead of one. You may wish to go over the tremolo circuit before attempting this one. In addition to making two vactrols as well as the wired up 555 timer (see LFO page), you will need two 470 ohm resistors, one 22 K ohm resistor, and one NPN transistor (2N3904 or 2N2222A transistors should work). The final circuit design can be seen below. |
| The green traces represent the current running through the oscillating portion of the circuit. The red traces the current flow from your electronic instrument through the 1/4" mono phone jack through the appropriate vactrols and out the 1/4" stereo phone jack. If you place your pointer on the circuit below, the schematic changes from the OFF output state of the 555 timer to an ON output state. Notice the green traces and how it switches from one vactrol to the next. As the 555 timer oscillates, the stereo panning will take effect. |
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