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Tiliqua Based on Amaranth HDL software Sebastian Holzapfel, of German open source audio hardware specialist apfelaudio, wants to put a little FPGA in your Eurorack synthesizer setup — literally, with the Tiliqua module. "Tiliqua aims to make FPGA-based audio and video synthesis accessible to everyone," Holzapfel explains of his creation. "The Tiliqua hardware architecture, alongside a comprehensive collection of example projects built in Python (Amaranth HDL [Hardware Description Language]), allows you to experiment with synthesis techniques that are out of reach of embedded microcontroller-based platforms. Think extreme oversampling for alias-free audio-rate modulation, low-latency effects, video synthesis, and high-speed USB audio." Tiliqua itself, designed to slot straight in to a Eurorack setup, is based on an open-hardware FPGA module dubbed the soldiercrab and built around the Lattice ECP5 field-programmable gate array chip, with 25k logic elements, 16MB of H...

  Fluorite castings were produced eventually by freezing purified molten CaF2, contained in chemically clean graphite crucibles, in a vacuum-type contrivance patterned after the atmospheric furnace which had been developed earlier for growing lithium fluoride crystals. The melt was prepared by heating selected fragments of colorless fluorspar mixed with about 2 percent PbF2 which acted as a scavenger to eliminate certain more or less unavoidable impurities, notably products of hydrolysis, and which escaped before the crystallization. In a few instances it was made from a specially synthesized material although this procedure was not wholly desirable. The crucibles were made by boring, reaming and turning graphite rods which possessed exceptional strength, homogeneity, and chemical purity. Their wall thickness was approximately 0.03 inch when feasible. Crystallization occurred preferably in a thermal field characterized by a high, nonlinear temperature gradient which remained nearly...