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...

Weird Sound Generator

This is my first post after a long holiday. I expected to had gotten a lot more stuff built that what I did. I was only able to build two things out of like the six things I wanted to build. One of the things I was able to finish was a Weird Sound Generator from MFOS for a friend of mine. Although when I mailed it, the stupid post office punted it all the way to Illinois and broke the battery connection.

I'm not smart enough to label the differences in the knobs in the switches in the two voices. Especially since they only label everything in the diagram as zany and wacky. The only thing I was able to figure out was that the black knobs with the silver tops are the rate knobs for the oscillators for each voice.

The silver bumps on the back are body contacts to some random points on the circuit board.

The coolest part of this by far is the low pass filter. I would like to build a stand alone low pass filter from this device. Here is a schematic for the filter...

Here is a video of it in action...