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Project Diana bounces radio waves off moon, January 10, 1946
The US Army Signal Corps made the first attempt to "touch" another celestial body when on January 10, 1946, it bounced radio signals off the moon and received the reflected signals. Dubbed "Project Diana" for the Roman moon goddess, the effort led to what is today known as EME (Earth-Moon-Earth) communications, used for ham radio...
The basics of Bluetooth Low Energy
Bluetooth technology has revolutionized wireless communications between devices with its ubiquitous and simple characteristics. It allows devices to communicate without cables while maintaining high levels of security. Because of its low power and low cost, Bluetooth has played a pivotal role in the evolution of applications from high-speed automotive devices to complex medical devices...
Increase Output Voltage With A Voltage Multiplier
Applications such as printers, laser-based fiber optic systems, and charged-particle air filtration systems require hundreds or even thousands of volts at low power. Flyback converters and autotransformer boosts are reasonable topology choices, but require custom transformers and require less-than-desirable high-voltage components...
Accurate and integrated temperature measurement
Most electronic engineers know that a transistor's base-emitter voltage has a temperature coefficient of about –2 mV/°C. However, for precision temperature sensors, "about" isn't good enough. A number of ingenious designs have capitalized on the basic relationship in ways that guarantee accuracy...
Retro ICs that Will Never Die
From the 555 timer to the LM317 regulator, many old-time components still can be had from suppliers to help engineers, hobbyists, or even college students complete their projects...
Power supplies go digital
Digital control inside an on-board power supply facilitates improved efficiency, reduced total cost and advanced system power management. The following is from an Ericsson white paper and is very relevant to Digital Power...
Intel takes another step into the Arduino world
The Arduino began life as a simple and inexpensive 8-bit microcontroller teaching tool. In the intervening decade plus, it’s grown into a diverse platform that has revolutionized the microcontroller education and hobby worlds. Recent, more powerful additions to the Arduino family have added 16 and 32 bit processors and have brought the Arduino into commercial development as a rapid prototyping platform...
James R. Biard, GaAs Infrared LED Inventor. Part 2
In 1964, you filed a patent for Schottky bipolar TTL logic circuits. In 1969, Intel released their first product, which used Schottky TTL. Can you explain how your patent came about? Was Intel was ever made aware of the work you did 5 years prior...
James R. Biard, GaAs Infrared LED Inventor. Part 1
Dr. James R. “Bob” Biard is an American electrical engineer and inventor who holds 72 U.S. patents, including the GaAs infrared light-emitting diode, the optical isolator, the Schottky transistor, and Metal Oxide Semiconductor Read Only Memory...
Thermal design: Get the heat out of the electronics
If you have high-powered LEDS, or a power supply, or are trying to control larger motors, you have to get a lot of heat out of your circuit boards. The classic way to dissipate heat is to bolt your power transistor to an aluminum heat sink. That is a slow, messy, and expensive proposition, especially if you need thermal grease between the transistor and heat sink...
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