Questions tagged [electronics]
Electronics is the study of electric circuits and electrical components, and the design of useful devices. Some questions in this tag may be more appropriate for the [Electrical Engineering(https://electronics.stackexchange.com/) SE site.
818 questions
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Why do power combiner circuits require a matched load on an unused input?
Let's consider this simple combiner circuit. To avoid drawing an additional stage, let the output be designed for 25 ohms:
Let's assume the bottom terminal is left open. Then half the current from ...
- reputation score 3254
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118 views
Can manufacture improvement remove the need of superconductivity in quantum compute?
For superconducting qubits, Josephson junctions are commonly used to enable the tunneling of Cooper pairs and, more importantly, to introduce the nonlinear energy spectrum required for qubit operation....
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Thevenin's Theorem and Resistances in Circuit [closed]
What is the difference in the approach and usefulness from Thevenin's Theorem and simply taking out equivalent resistances/capacitances (like taking sum for equivalent series resistance or equivalent ...
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456 views
In a half-wave rectifier through a transformer, is the primary current also "half-wave rectified"?
We are asked to calculate the RMS current in the primary coil.
The model solution is multi-step:
Since Y is twice the resistance of X, the power dissipated must be half that of X (by $P = V^2/R$). So ...
- reputation score 24320
Score of -2
3 answers
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What will happen if we give diode same voltage as its own potential barrier voltage?
A silicon diode has a potential barrier voltage of 0.7V . If we connect a battery whose voltage is same as silicon diode under foward and reverse biasing then what would happen.
In foward biasing the ...
- reputation score 79
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How do IGBT handle high currents? [closed]
How do insulated-gate bipolar transistors (IGBT) handle high currents despite the PNP in it's equivalent circuit being driven in active mode?
My understanding is that active mode bipolar junction ...
- reputation score 202
Score of -1
1 answer
113 views
What function does the body in a depletion type MOSFET serve?
Wouldn't replacing the body of a depletion mode mosfet with an insulator eliminate the body effect? My best guess is its either an issue of ease of manufacturing, or an issue of surface states ...
- reputation score 202
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404 views
How does a BJT wired as a "negistor" function?
A negistor is a npn BJT with the base unconnected, functioning as a replacement for a tunnel diode in certain oscillator circuits, producing negative differential resistance though the voltage current ...
- reputation score 202
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125 views
How does injection of majority carriers create amplification in point contact transistors?
At 3:30 in this YouTube video, it is claimed that injection of holes from the emitter into the collector causes a current to flow across the reverse biased junction, however I fail to see how this ...
- reputation score 202
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283 views
How does the p region of a thyristor become an n region during gate triggering?
At 5:10 in this video on thyristors, it is said that gate triggering injects electrons into the p region however I fail to see how this could be the case. None of the websites I checked explained why ...
- reputation score 202
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177 views
How are the purest possible audio tones produced?
A pure tone is an idealized audio signal that is perfectly sinusoidal, with a fixed frequency, amplitude, and phase offset.
No physical electronic speaker, tuning fork, etc. can produce an ideal pure ...
- reputation score 55193
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375 views
Threshold voltage equation for a MOSFET
I have encountered the equation of threshold voltage for a MOSFET as
$$ V_{th} = \phi_{ms} + \frac{Q_{ox}}{C_{ox}} + 2\phi_f + \frac{Q_{dep}}{C_{ox}} $$
I understand that the components are as follows:...
- reputation score 61
Score of 16
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Piezoelectric microphone element is activated by green or 405nm UV laser light but not 650nm red light. Why?
I built a high gain amplifier taking its input from a piezoelectric sensor. The sensor is a circular disk of what looks like brass with diameter 15mm where the brass thickness is around 0.14mm. On top ...
- reputation score 537
Score of 1
1 answer
151 views
Hole density of PN junction in reverse bias
I'm trying to calculate the hole density along the length of a simple PN junction in reverse bias, $V_B$. In particular, I would like to compute the minimum density p_min shown in the attached graph.
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- reputation score 1476
Score of 5
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790 views
Question magnetism HDD and CRT TV
If a 2.5" HDD is placed very close (2 cm or 3 cm) to a large 29" CRT TV Power off, could this TV, due to its large and powerful magnets and coils, cause some degradation in the HDD's 2.5&...
- reputation score 89