This circuit was originally intended for reading movie soundtracks. The circuit is from 1967 and was found in an English publication. The sensor is semiconductor type.
This vox was found in Hughes documentation from 1968. The circuit uses components from the era. A...
This circuit is from Mullard documentation from 1969. Transistors support current equivalents. Output...
September 2017 - Microchip's MCP6411 operational amplifiers for frequencies up to 1 MHz are in...