Electronic devices and gadgets. Most of these still do not have pages. That will change in the future as digital-format information on the devices becomes available.

ElectroTech Industries Betron I single-transistor beta meter: A simple device for measuring the beta of single NPN or PNP BJTs. In early development.

TechTech Technologies Ophiuchus I Modular Theremin: A pair of capacitative sensors that produce voltages instead of frequency. The goal is to create a more general form of Theremin. The output voltages may be used to drive external devices such as effects pedals, or they may be used as inputs to modules attached to the Theremin itself to generate new outputs. Each sensor controls the frequency of a digital oscillator. A microcontroller with some external logic counts the number of clocks cycles in some fixed period of time (<50ms), applies some simple transformations to the result, and then produces a DC output using an ADC.

PhonoTech Technologies Apollo I Mechanical Listener: A stereo microphone. Redesigning again...

PhonoTech Technologies Prometheus I Digital Oscillophone: A dream. We know how to build it. We just need the time and organization.