Stylophone

The Stylophone is a miniature analog stylus-operated keyboard. Invented in 1967 by Brian Jarvis, it entered production in 1968, manufactured by Dubreq. It consists of a metal keyboard played by touching it with a stylus—each note being connected to a voltage-controlled oscillator via a different-value resistor—thus closing a circuit. The only other controls were a power switch and a vibrato control on the front panel beside the keyboard, and a tuning control on the rear. Some three million Stylophones were sold, mostly as children's toys.

The Stylophone was available in three variants: standard, bass, and treble, the standard one being by far the most common. There was also a larger version called the 350S with more notes on the keyboard, various voices, a novel 'wah-wah' effect that was controlled by moving one's hand over a photo-sensor, and two styluses.

In the mid-1970s a new model appeared which featured pseudo-wood on the speaker panel and a volume control. This was shortly before the Stylophone ceased production altogether in 1975.