START-DET PMT-Base-H..
... where 4KT = 1.63 x 10-20 W/Hz (at 70.5 degrees F), R = resistance in ohms, and f is frequency bandwidth in Hz. Using 2 G ohm total resistance, and a bandwidth of 10 Hz we obtain a voltage noise contribution of ~18 uV which would translate into a current noise of 0.18 nA across the sense resistor. ...
... where 4KT = 1.63 x 10-20 W/Hz (at 70.5 degrees F), R = resistance in ohms, and f is frequency bandwidth in Hz. Using 2 G ohm total resistance, and a bandwidth of 10 Hz we obtain a voltage noise contribution of ~18 uV which would translate into a current noise of 0.18 nA across the sense resistor. ...
A3. Revision notes - Practical Electricity
... switches ON and the LED comes on. By adjusting the variable resistor, we can adjust the temperature at which the LED comes on. By switching the position of the two resistors, we can make a circuit that turns on the LED if the temperature gets too low. ...
... switches ON and the LED comes on. By adjusting the variable resistor, we can adjust the temperature at which the LED comes on. By switching the position of the two resistors, we can make a circuit that turns on the LED if the temperature gets too low. ...
ideal voltage and current sources
... voltage source, V, has a voltage V between its terminals (in the direction indicated by the arrow), no matter what current is flowing in the source. For example, an ideal 5 V source has a voltage of 5 V across its terminals, for currents of 1 mA, 1 A or 1000 A. This behaviour contrasts with a real s ...
... voltage source, V, has a voltage V between its terminals (in the direction indicated by the arrow), no matter what current is flowing in the source. For example, an ideal 5 V source has a voltage of 5 V across its terminals, for currents of 1 mA, 1 A or 1000 A. This behaviour contrasts with a real s ...
Basic Electronic Circuits
... The farad is the unit of capacitance. A farad is one coulomb (6.25e 18 electrons) of charge at 1 volt. That is a lot of charge! Most capacitors are rated in microfarads. Common capacitor applications include storing charges for high speed use, such as in a flash of a camera. Capacitors can also smoo ...
... The farad is the unit of capacitance. A farad is one coulomb (6.25e 18 electrons) of charge at 1 volt. That is a lot of charge! Most capacitors are rated in microfarads. Common capacitor applications include storing charges for high speed use, such as in a flash of a camera. Capacitors can also smoo ...
Feedback_what did I learn
... All the above are right. I can add 1. Current source is required to provide a constant DC bias current to an electronic amplifier. 2. Current mirror is used to provide a DC bias current which is proportional to the current in the reference current source. 3. The size of the mirror transistor can be ...
... All the above are right. I can add 1. Current source is required to provide a constant DC bias current to an electronic amplifier. 2. Current mirror is used to provide a DC bias current which is proportional to the current in the reference current source. 3. The size of the mirror transistor can be ...
LN2541
... pulses set the SR flip-flop in the LN2543 which causes the GATE driver to turn on. When the FET turns on, the current through the inductor starts ramping up. This current flows through the external sense resistor RCS and produces a ramp voltage at the CS pin. The comparators are constantly comparing ...
... pulses set the SR flip-flop in the LN2543 which causes the GATE driver to turn on. When the FET turns on, the current through the inductor starts ramping up. This current flows through the external sense resistor RCS and produces a ramp voltage at the CS pin. The comparators are constantly comparing ...
EEG 443
... exciter, then raise the field current to 0.1 A, make sure the speed is at rated value, then record the generator line voltage. Increase the field current to 0.2 A, adjust the speed and record the phase voltage. Continue with these discrete steps until the phase voltage reaches 130 V. (d) When finish ...
... exciter, then raise the field current to 0.1 A, make sure the speed is at rated value, then record the generator line voltage. Increase the field current to 0.2 A, adjust the speed and record the phase voltage. Continue with these discrete steps until the phase voltage reaches 130 V. (d) When finish ...
2N3904
... support device or system whose failure to perform can the body, or (b) support or sustain life, or (c) whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system, or to affect its safety or with instructions for use prov ...
... support device or system whose failure to perform can the body, or (b) support or sustain life, or (c) whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system, or to affect its safety or with instructions for use prov ...
TRIAC
TRIAC, from triode for alternating current, is a genericized tradename for an electronic component that can conduct current in either direction when it is triggered (turned on), and is formally called a bidirectional triode thyristor or bilateral triode thyristor.TRIACs are a subset of thyristors and are closely related to silicon controlled rectifiers (SCR). However, unlike SCRs, which are unidirectional devices (that is, they can conduct current only in one direction), TRIACs are bidirectional and so allow current in either direction. Another difference from SCRs is that TRIAC current can be enabled by either a positive or negative current applied to its gate electrode, whereas SCRs can be triggered only by positive current into the gate. To create a triggering current, a positive or negative voltage has to be applied to the gate with respect to the MT1 terminal (otherwise known as A1).Once triggered, the device continues to conduct until the current drops below a certain threshold called the holding current.The bidirectionality makes TRIACs very convenient switches for alternating-current (AC) circuits, also allowing them to control very large power flows with milliampere-scale gate currents. In addition, applying a trigger pulse at a controlled phase angle in an AC cycle allows control of the percentage of current that flows through the TRIAC to the load (phase control), which is commonly used, for example, in controlling the speed of low-power induction motors, in dimming lamps, and in controlling AC heating resistors.