3SU1900-0BC31-0AA0 in stock. German 3SU1900-0BC31-0AA0 electrical components. 3SU1900-0BC31-0AA0 inventory.

3SU1900-0BC31-0AA0 electrical component is one of the earliest devices for amplifying electrical signals. The cathode electron emission part, control grid, accelerating grid, and anode (plate) leads, enclosed in a glass container (typically a glass tube), are soldered to the tube base. It uses an electric field to inject electrons into the control grid in a vacuum to modulate the signal, and obtains signal data with different parameters after amplification or feedback oscillation at the anode. Early applications included electronic products such as televisions, radios, and loudspeakers; later, it was gradually replaced by amplifiers and integrated circuits made from semiconductor materials. However, in some high-fidelity audio equipment, vacuum tubes with low noise and high stability coefficients are still used as audio power amplification devices (in Hong Kong, vacuum tube power amplifiers are referred to as "tube amplifiers").

3SU1900-0BC31-0AA0 electrical component parameters

(1) Rated operating voltage: refers to the voltage required by the coil for the relay to operate normally. Depending on the relay model, it can be AC voltage or DC voltage. (2) DC resistance: refers to the DC resistance of the coil in the relay, which can be measured with a multimeter. (3) Pull-in current: refers to the minimum current required for the relay to perform the pull-in action. During normal use, the supplied current must be slightly greater than the pull-in current to ensure stable operation of the relay. The operating voltage applied to the coil should generally not exceed the rated operating voltage; otherwise, excessive current may burn out the coil. (4) Release current: refers to the maximum current at which the relay performs the release action. When the current in the pulled-in state of the relay decreases to a certain level, the relay returns to the de-energized release state. This current is much lower than the pull-in current. (5) Contact switching voltage and current: refer to the voltage and current that the relay is allowed to handle. These values determine the magnitude of voltage and current the relay can control. Do not exceed these values during use, as doing so may easily damage the relay contacts.

3SU1900-0BC31-0AA0 electrical component principle

Inductance is the ratio of the magnetic flux in and around a conductor to the current producing this flux when alternating current flows through the conductor. When direct current flows through an inductor, only static magnetic field lines are present around it, which do not change with time. However, when alternating current flows through the coil, the magnetic field lines around it change with time. According to Faraday's law of electromagnetic induction (magnetism generating electricity), changing magnetic field lines induce an electromotive force (EMF) across the coil terminals. This induced EMF acts as a "new power source." When a closed loop is formed, this induced EMF generates an induced current. According to Lenz's law, the total magnetic flux generated by the induced current attempts to oppose the change in the original magnetic flux. Since the change in the original magnetic flux originates from the changes in the externally applied alternating power source, the inductor coil objectively exhibits the characteristic of opposing changes in current in an AC circuit. An inductor coil has characteristics similar to inertia in mechanics, known in electrical engineering as "self-inductance." Sparks often occur at the instant of opening or closing a knife switch, which is caused by the high induced EMF generated by self-inductance.

3SU1900-0BC31-0AA0 electrical component function

The self-induced EMF in an inductor coil always opposes the change in current within the coil. The inductor coil impedes alternating current; the magnitude of this impedance is called inductive reactance xl, measured in ohms. Its relationship with inductance l and AC frequency f is xl=2πfl. Inductors are mainly classified into high-frequency chokes and low-frequency chokes. An inductor coil connected in parallel with a capacitor forms an lc tuning circuit. When the natural oscillation frequency f0 of the circuit equals the frequency f of the AC signal, the inductive reactance equals the capacitive reactance. Electromagnetic energy then oscillates back and forth between the inductor and the capacitor; this is the resonance phenomenon of the lc circuit. At resonance, the inductive and capacitive reactances are equal in magnitude but opposite in phase. The total inductive reactance of the circuit is minimized, and the current is maximized (for AC signals where f="f4"). The lc resonant circuit has frequency selection capability, allowing it to select AC signals of a specific frequency f.

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