Hieronymus subsequently designed solid-state versions of his Analyzers, substituting germanium transistors for crystal prisms and tunable capacitors for the rotating armature.

He used these junctions to build solid-state versions of amplifiers, oscillators, and TRF and regenerative radio receivers, at frequencies up to 5 MHz, 25 years before the transistor.

These included transistorised 'solid-state' versions: the Pianet C, and the modernist, lidless Pianet L with metal legs and built in amplifier and speakers.

Buoyed by the success of the DA-20, Keio released a solid-state version of the Rhythm machine, the Donca matic DE-20, in 1966.

The original SJ-202 is the radar used by the HQ-2 series SAM and its successor; the SJ-212 is a fully solid-state version which is also completely digitized, although both radars look very similar externally.

This is a fully solid-state, highly digitized version that adopts planar active phased array antenna.

In the late 1950s, solid-state versions were developed by Donald E. Bently at Bently Nevada Corporation.

This technology mainly involves heterogeneous catalysts, but it is widely assumed that the principles and observations on homogeneous systems are applicable to the solid-state versions.

(The newer iPod models got slimmer by replacing that wheel with a solid-state version and by using a smaller battery.)

Officials at both American and United Airlines said the black boxes aboard their destroyed aircraft were modern solid-state versions, which are more resistant to damage than the older magnetic tape recorders.