The Atari Punk Console (aka the Stepped Tone Generator) is basically a simple sound synth that is made using only two 555 timer ICs.

Step 1: Ingredients

The parts you need are:
2x LM555 timer ICs
2x 500k potentiometers
1x 10 uf electrolyctic capacitor
1x .01 uf ceramic disk capacitor
1x .1 uf ceramic disk capacitor
1x 1k resistor (brown, black, red, gold)
1x 8 ohm speaker
1x 9 volt battery and clip
1x pad-per-hole perfboard
lots of wire
solder

The tools you need are:
soldering iron
wire snippers
desoldering pump (or bulb/wick)
optional but very recommend: helping hands tool

Step 2: Put It Together

I used a small piece of pad-per-hole perfboard and used solid core wire as jumper wire. I used stranded core wire for connecting the pots to the board.