via this auction
"SKULL-FACE QUAD NAND SYNTH.
An ambient yet horrific light source and square-wave nosie maker.
The synth is based around a 4093 quad nand gate CMOS chip.
Capable of hideously beautiful beepy noise.
The 4 cascaded oscillators interact with each other to create a relentless range of synth tones.
The power starve dial adds further modulation and manipulation of the oscillations.
The noise-making circuit is built into a Halloween skull toy.
It was supposed to have a flickering red LED in it, but I swapped it for another, more exciting lighting circuit,
This circuit has several different single-colour options as well as a colour cycling mode.
The controls are as follows:
4 dials on top to control the rate and tone of the oscillations.
1 dial for the 4093 power starve.
2 switches; 1 momentary push button and 1 toggle switch to start the noises.
1 momentary push button to cycle through the LED colour options.
1 output jack located on the back side.
1 on/off switch on the underside of the cube.
A PP3/9v battery holder on the back.
The SKULL-FACE fits well into the palm and can be enjoyed by anyone with a passion for harsh, grinding noise terrorism and pretty colours.
It's powered by a single 9v battery which is housed in the holder at the back of the SKULL-FACE.
There's a 6.35mm jack socket for hooking up to your amp/mixer/effects.
There's no internal speaker!"
YouTube Uploaded by TheZombiest on Nov 26, 2010
'a lovely 4093 quad nand synth inside a cheapo halloween skull.
4 cascaded oscillators and a voltage starve as standard. A colour changing LED which can be switched on and off and a trigger button and switch for making the noises happen."
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