Fake ad of my nandsynth.
Here's my take on the nand synth noise maker. I used the PCB from Synthrotek
The board has extra holes for modding and customization. In that space I added Synthrotek's 555 oscillator (http://www.synthrotek.com/products/555-timer/), and injected it into the circuit. My other mods include a voltage choke with the momentary switch in-line with the power supply. I also added a simple volume / passive tone control like one found in a guitar.