Rosa Forza Ronzio Palla

This is the first thing I've ever built that I was able to sell. I spent a lot of time working on the led display for this it. They flash so bright and so fast, it's almost seizure inducing.

There are four oscillators from a 40106 chip and a low pass filter using a 741 op amp. The filter is taken from MFOS Weird Sound Generator. Each oscillator corresponds to a different color. They each have an on/off switch and a high/low switch.

It has a volume knob and a voltage sag knob. There is a push button next to the power switch that also turns it on. When you push it, you can hear the big capacitor fill and empty quickly.

The low pass filter has fine and coarse frequency cut off knobs and a resonance knob.

Here it is pre-paint job...

And post paint job...

 

Here is a look at the insides...

 

 Here is a close up look at the led display... 

 

Here is the circuit board...

This is the schematic for the low pass filter I used from the Weird Sound Generator.

Finally, here is a video of it...