Cyka

сука is a single 555 square wave pulse generator built using the point to point soldering (dead bug) technique...

The elegant simplicity of the machine hides the thing that makes it a unique instrument:

A photo resistor is mounted on the top of the enclosure...

When the light is blocked the rate/pitch lowers...

As the light becomes more intense, the pitch/rate increases...

The potentiometer on the top panel controls the timer speed...

Switch 1 (side panel): Power (9 volt battery included)

Switch 2 (side panel): pitch shifter 

In general, I make every circuit from scratch, by hand, using blank stripboard or point to point soldering...

However I occasionally 

re-purpose or circuit bend existing boards...

My current enclosures are re-purposed boxes and tins with artwork that I cut out of old books and magazines...NO A.I...