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The reed switch [i] is an electromechanical switch operated by an applied magnetic field. It was invented in 1922 by professor Valentin Kovalenkov at the Petrograd Electrotechnical University , [ 1 ] and later evolved at Bell Telephone Laboratories in 1936 by Walter B. Ellwood into the reed relay.
The switch generally provides good isolation between the control signal and the input/output signals. They are not used for high voltage switching. Important parameters of an analogue switch are: on-resistance: the resistance when switched on. This commonly ranges from 5 ohms to a few hundred ohms. off-resistance: the resistance when switched off.
Contact resistance values are typically small (in the microohm to milliohm range). Contact resistance can cause significant voltage drops and heating in circuits with high current. Because contact resistance adds to the intrinsic resistance of the conductors, it can cause significant measurement errors when exact resistance values are needed.
In a switch where the contacts remain in one state unless actuated, such as a push-button switch, the contacts can either be normally open (abbreviated "n.o." or "no") until closed by operation of the switch, or normally closed ("n.c." or "nc") [nb 1] and opened by the switch action.
Buck converters typically operate with a switching frequency range from 100 kHz to a few MHz (citation needed). ... R on is the ON-resistance of each switch, and; R ...
When the switch is open the voltage of the gate input is pulled up to the level of Vin. When the switch is closed, the input voltage at the gate goes to ground. In electronic logic circuits , a pull-up resistor ( PU ) or pull-down resistor ( PD ) is a resistor used to ensure a known state for a signal. [ 1 ]
A resistance decade box or resistor substitution box is a unit containing resistors of many values, with one or more mechanical switches which allow any one of various discrete resistances offered by the box to be dialed in. Usually the resistance is accurate to high precision, ranging from laboratory/calibration grade accuracy of 20 parts per ...
A low-voltage MOSFET is also limited by the parasitic resistance of its package, as its intrinsic on-state resistance is as low as one or two milliohms. Some of the most common type of power semiconductor packages include the TO-220, TO-247, TO-262, TO-3, D 2 Pak, etc.