There are two oscillators made with the Nand gates of the 4093. The 100K pot controls the pitch of the gated oscillators on IC 4093. The switches allow for; either pulse ore gated/osc mode, or channel on and off.
For more information on the Nand 4093 IC click here.
Credits on the creation of the PCB board go to synthrotek.com
Here is a video demonstration of the synth:
Step 1: Tools and Materials
- X1, 4093 IC Quad Oscillator Chip.
- X1, 14-Pin Socket.
- X1, LED: Which ever colour will do, although I do recommend a red coloured LED as it will be used to indicate if the synth is on.
- X2, 1 Mega Ohm linear Variables resistors or potentiometers.
- X1, 100K linear Variable resistor or potentiometer.
- X1, 100K Audio Variable resistor or potentiometer.
- X1, SPST Switch.
- X2, SPDT Switch.
- X1, 1 Kilo Ohm resistor.
- X4, 100 Kil Ohm resistors.
- X4, 100 nF Ceramic Capacitors.
- X1, 2.2 uF Electrolytic Capacitor.
- X1, 100 uF Electrolytic Capacitor.
- X1, Quarter inch or Half an inch mono female jack.
- X1, DC Jack or a 9V battery clip.
- X1, Project box or enclosure of some sort.
- X4, Knobs for the potentiometers, only if you wish so.
- X1, 9V Battery or you could also have 4XAA running on less voltage. (I had AA's batteries laying around, so that's what I used) - These are optional if you are using the 9V battery Clip instead of a DC Jack.
- Wire, probably about a meter and a half or so. (5ft)
- A PCB, you can either buy a plain PCB or buy a pre-made one here.
- Drill and some drill bits.
- Screws of course.
- Soldering Iron.
Step 2: PCB Wiring and Schematic
Step 3: Housing
Step 4: Wrapping Up
I also found a really cool project based on the nand synth: http://hackingbynight.wordpress.com/2008/12/21/gated-nand-drone-synth/