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For over 65 years Edmund Optics (EO) has been a leading producer of optics, imaging, and photonics technology.

Raltron - Global supplier of frequency management solutions, including quartz filter, crystal, oscillator, clock, VCXO, TCXO, OCXO, Stratum 3 synchron...

MathWorks is the world’s leading developer of technical computing software for engineers and scientists in industry, government, and education

Instructables is the Biggest How To and DIY community where people make and share inspiring, entertaining, and useful projects, recipes, and hacks.

Omega Optical provides the most diverse offering of interference filters in the industry for microscopy, astronomy, aerospace, life science, and more.

Johanson Technology provides High Frequency Ceramic Solutions for cellular, WLAN, Bluetooth, RF/Microwave, Millimeter Wave, and Fiber Optic applicatio...

MidOpt is the specialist in machine vision filters, lenses and accessories worldwide. Our goal is to help your systems SEE better.

Dunestar Systems manufactures RF Bandpass Filters, HF Highpass Filters, Portable Antennas and Switching Devices, as well as custom applications for am...

ESP - The Audio Pages. Professional results for the DIY enthusiast. Audio articles, projects to build and general information about hi-fi amplifiers, ...