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TOI-2109 is a F-type main-sequence star, a star moderately larger, hotter and more luminous than the Sun that is fusing atoms of hydrogen into helium at its core.It is 1.7 times larger than the Sun, comparable to Sirius A, 1.4 times more massive and nearly five times brighter.
An OCXO inside an HP digital frequency counter Miniature crystal oven used to stabilize the frequency of a vacuum-tube mobile radio transmitter. A crystal oven is a temperature-controlled chamber used to maintain the quartz crystal in electronic crystal oscillators at a constant temperature, in order to prevent changes in the frequency due to variations in ambient temperature.
Like the BaTiO 3 thermistor, this device has a highly nonlinear resistance/temperature response useful for thermal or circuit control, not for temperature measurement. Besides circuit elements used to limit current, self-limiting heaters can be made in the form of wires or strips, useful for heat tracing. PTC thermistors "latch" into a hot ...
An electronic kit is a package of electrical components used to build an electronic device. Generally, kits are composed of electronic components, a circuit diagram (schematic), assembly instructions, and often a printed circuit board (PCB) or another type of prototyping board. There are two types of kits. Some build a single device or system.
The first kit was a circuit board for the "Cyclops Intrusion Detector" for an article in the May 1968 issue of Popular Electronics. [1] Starting in 1972 PAiA began producing analog synthesizer kits, in both modular and all-in-one form. PAiA began publishing Polyphony Magazine in June 1975. [2]
A thermal protection circuit consists of a temperature-monitoring circuit and a control circuit. The control circuit may either shut down the circuitry it is protecting, reduce the power available in order to avoid overheating, or notify the system (software or user). These circuits may be quite complex, programmable and software-run, or simple ...