“From Ray Wilson, inventor of the Soundlab Mini Synth comes the Wacky Electronic Noise Maker Thingy. It’s a much simpler circuit, which produces surprisingly cool pulsing, bleeping type noises. You can hear sound clips here. It’s made with a handful of components, a few pots and switches and a 9v battery. There’s a very clear schematic, a PCB design and a stripboard layout.” Thanks Tom! Link.
Super-simple DIY synth plans