Introducing The PhotoSynTheremin kit – an optical photoreflecive theremin. As you move your hand closer to, or further away from the board, a 48kHz modulated infra-red emitter & photodiode detector turn the intensity of the reflected light into an audible signal. That signal is then amplified and emitted from a PC mounted speaker.
The kit is predominantly through-hole construction, with the exception of a spiffy rear-mounted LED which shines through the PCB/logo for power indication. The kit utilizes a few classic integrated circuits that have been grey bearded staples of the electronics arena for decades – the LM324 quad operational amplifier, used for detection and 48kHz filter, LM386 audio amplifier & the 555 timer IC used to modulate the IR emitter. Stay tuned as parts come in!