After a long and painful struggle, I managed to build an equaliser—the heart of the future otomixer, which is an object appearing in the story about artificial silence. The equaliser has 6 bands (band #1: frequency 50Hz [100nF capacitor used]; #2: ~100Hz? [50nF]; #3: ~250Hz? [25.3nF]; #4: 500Hz [10nF]; #5: ~1000Hz [6.8nF]; #6: 1600Hz [3.3nF]) and still generates a bit too much noise, but it is negligible in the project and can be sorted later on.
The equaliser (on the left half of the breadboard) is connected to an amplifier (on the upper right side) through an audio transformer (big single part in the middle). I used a LM741 IC for the equaliser and a LM386 for the amp. I still think if it is advisable to show the mechanism of the equaliser in the final show or hide it inside a nice futuristic casing...?
