https://electrical.codidact.com/categories/26/tags/2900.rssNew Posts Tagged 'component' - Electrical EngineeringElectrical Engineering - Codidact2024-03-10T19:32:41Zhttps://electrical.codidact.com/posts/291023MOSFET drain current ringing in saturation regionkadamrohan16https://electrical.codidact.com/users/562022024-03-10T07:51:17Z2024-03-10T19:32:41Z<p>I benchtested below 0.7A constant current source circuit and observed few cycles of oscillation on drain current. With the help of bode plot analysis , I have managed to reduce the oscillations ...https://electrical.codidact.com/posts/291003Matched transistorsChupacabrashttps://electrical.codidact.com/users/530332024-03-06T09:56:30Z2024-03-06T10:48:15Z<p>There are circuits that require matched transistors. Whether BJTs or FETs.<br>
Like current mirrors, logarithmic amplifiers, etc.. There are some examples:<br>
<a href="https://www.youtube.com...https://electrical.codidact.com/posts/290591High voltage transformer designjonathan_the_seagullhttps://electrical.codidact.com/users/550272024-01-19T05:28:21Z2024-01-22T11:30:46Z<p>Suppose I have a planar PCB transformer. The primary and secondary coils are printed on different PCBs. The core is inserted through these PCBs to link the two coils. The primary is at a low vol...https://electrical.codidact.com/posts/290448Transformer design for a Series Resonant Converterjonathan_the_seagullhttps://electrical.codidact.com/users/550272023-12-16T14:21:23Z2023-12-19T18:43:41Z<p>I am determining the Area-Product of the core required for a transformer to be used within a series resonant converter. The specifications are as follows:</p>
<ul>
<li>Switching frequency = 40...https://electrical.codidact.com/posts/290166Can I make an AC inductor (reactor) rated 75mH 40A from a 3-phase induction motor?Fabio Baronehttps://electrical.codidact.com/users/682442023-11-04T02:26:02Z2023-12-12T08:53:12Z<p>For my test bench I need an inductor (aka "reactor") that meets the requirements below. I have tried to purchase it outright as a made-up item, or the parts to make it (core and windings), but h...https://electrical.codidact.com/posts/290284Ceramic capacitor "memory" effect?Olin Lathrophttps://electrical.codidact.com/users/363962023-11-24T17:44:07Z2023-12-02T15:44:00Z<p>I have run into an interesting phenomenon related to ceramic capacitors. This question is part of the effort to understand the issue, and eventually work around it. But first, some background ...https://electrical.codidact.com/posts/290324What fabrication process is being used for jellybean partsdekkerhttps://electrical.codidact.com/users/538322023-11-30T17:04:33Z2023-12-02T14:35:49Z<p>I want to know why the top-of-the-line CPUs and GPUs from
Intel, NVIDIA, and AMD are all bragging about the fabrication process (7nm and 5nm) and trying to be consistently smaller. At the same ...https://electrical.codidact.com/posts/289797derating MLCC ripple current for transient current spikeskellogshttps://electrical.codidact.com/users/603992023-09-24T10:42:31Z2023-10-06T23:47:20Z<p>This graph - MLCC temperature rise vs ripple current RMS & frequency</p>
<p><img alt="Image_alt_text" src="https://electrical.codidact.com/uploads/by7ol4n57tsdnyh4q8lchyx1fl8d"></p>
<p>If ...https://electrical.codidact.com/posts/289688Burned Source Driver - Noise Spikes from Relay Coilmrbeanhttps://electrical.codidact.com/users/654962023-09-14T01:03:00Z2023-09-15T16:35:56Z<p>I am trying to figure out what is causing an <a href="https://www.allegromicro.com/~/media/Files/Datasheets/A2981-2-Datasheet.ashx">Allegro A2982 source driver</a> to burn up.</p>
<p>The source...https://electrical.codidact.com/posts/289570Soft-start circuit behaviourMu3https://electrical.codidact.com/users/530142023-08-31T14:14:37Z2023-09-11T13:52:09Z<p>Let's take a soft-start circuit that looks like this:
<img alt="Soft-start circuit schematic" src="https://electrical.codidact.com/uploads/qalzx8onve1xu7zsttlcc6xs2fsp"></p>
<p>To my understan...https://electrical.codidact.com/posts/289528Power switches and automotive load dump, unclampedkellogshttps://electrical.codidact.com/users/603992023-08-24T11:47:32Z2023-08-29T00:00:36Z<p>Power switches used in automotive are usually rated to withstand clamped load dump events, of the 35 - 40 V peak variety. AFAICT there are two main clamping mechanisms - first one for the logic ...https://electrical.codidact.com/posts/284253Capacitance gain using conductive core for inductorsMissMulanhttps://electrical.codidact.com/users/541072021-09-19T15:48:32Z2023-08-13T19:06:55Z<p>I have learnt that if we have 2 parallel conductive plates and we seperate them the capacitance is increased if we put a good conductor between the plates.</p>
<p>Now the resonant frequency of ...https://electrical.codidact.com/posts/287532How to calculate the voltage of a coil?deleted user#2022-12-04T13:52:15Z2023-08-12T15:24:05Z<p>Hi guys, I need to calculate the voltage that will center the magnetic field of a coil. The coil gonna be used in an induction heater thank you.</p>
<p><img alt="coil" src="https://electrical.c...https://electrical.codidact.com/posts/286032Case temperature of MOSFETCarlhttps://electrical.codidact.com/users/542882022-02-25T17:54:04Z2023-08-12T15:18:28Z<p><strong>Homework problem</strong></p>
<blockquote>
<p>A MOSFET has a power dissipation of $P_{d} = 10\text{W}$. The MOSFET is mounted on a heatsink. There is an isolation pad between the MOSFE...https://electrical.codidact.com/posts/285024How does a transistor maintain a constant current?Circuit fantasisthttps://electrical.codidact.com/users/534902021-12-01T16:44:00Z2023-08-12T13:29:01Z<p>In contrast to <a href="https://electrical.codidact.com/posts/284995">diodes</a> that maintain a relatively constant voltage when the current through them varies, a fundamental property of all t...https://electrical.codidact.com/posts/285107Why does the collector current depend linearly on the base current?Circuit fantasisthttps://electrical.codidact.com/users/534902021-12-05T15:36:40Z2023-08-12T13:25:38Z<p>It is well known that there is a linear relationship between the BJT collector and base current (Ic = beta x Ib). It would be interesting to explain it in an intuitive way. The power of such a "...https://electrical.codidact.com/posts/286944Power amplifier for remote controllerStefanhttps://electrical.codidact.com/users/567482022-09-01T16:03:23Z2023-08-12T12:13:10Z<p>I'm designing remote controller based on NRF24L01 and STM32. I want to use SMA antenna. My question is regarding power amplifier (PA). When is it necessary to use one? The range I'm aiming for i...https://electrical.codidact.com/posts/277846Current Flow in the OFF Time of a Switching Power Supplyjm567https://electrical.codidact.com/users/532992020-09-01T01:13:05Z2023-08-12T11:41:45Z<p>I am having a difficult time picturing the flow of current and the role of the capacitor during the OFF time of a buck converter. Here is my understanding so far. During the ON time the magnetic...https://electrical.codidact.com/posts/282127Contactor control - Higher voltage PWM2kindhttps://electrical.codidact.com/users/534692021-06-09T21:10:11Z2023-08-12T11:41:05Z<p>I have a battery pack that consists of 18650 battery cells(14 cells in series max.). Hence, the voltage of the battery pack will be between 35V and 60V(to be on the safe side)</p>
<p>I am desig...https://electrical.codidact.com/posts/285849Flyback transformer for Vout > Vin2kindhttps://electrical.codidact.com/users/534692022-02-06T19:26:16Z2023-08-12T11:36:48Z<p>This question is asked in an addition to <a href="https://electrical.codidact.com/posts/276436">https://electrical.codidact.com/posts/276436</a></p>
<p>Here is a Flyback converter mentioned the...https://electrical.codidact.com/posts/282585Critically damped oscillation issueMissMulanhttps://electrical.codidact.com/users/541072021-07-07T16:50:49Z2023-08-12T10:24:55Z<p>I have a question about this circuit:(critically damped oscillation)</p>
<p><img alt="SeeMe" src="https://electrical.codidact.com/uploads/bcvK5rTywmz7b7MJYmqBgeV9"></p>
<p>For a critically dam...https://electrical.codidact.com/posts/284017Series RLC circuitMissMulanhttps://electrical.codidact.com/users/541072021-09-06T16:32:24Z2023-08-12T10:24:31Z<p>How to find the equation of current of the RLC circuit after the switch is moved?</p>
<p><img alt="" src="https://electrical.codidact.com/uploads/87iESoUu42B4bQo2FKTogWHp"></p>
<!-- g: js, mdi...https://electrical.codidact.com/posts/284074Parallel RLC circuitMissMulanhttps://electrical.codidact.com/users/541072021-09-08T15:55:22Z2023-08-12T10:24:04Z<p>How to find the equation of voltage of the top common node of R1,L1 and C1 after the switch is moved?</p>
<p><img alt="" src="https://electrical.codidact.com/uploads/TevMpbc9kY6tse4mnkjBN8Cp">...https://electrical.codidact.com/posts/284995How does a diode maintain a constant voltage?Circuit fantasisthttps://electrical.codidact.com/users/534902021-11-26T20:45:14Z2023-08-10T20:25:30Z<p>A fundamental property of all types of diodes (silicon, germanium, Schottky, LEDs, Zener ...) is to maintain a relatively constant voltage when the current through them varies. How do they do th...https://electrical.codidact.com/posts/286434What is this fourth connection in NMOS device?NMOS loverhttps://electrical.codidact.com/users/566092022-05-12T08:25:54Z2023-08-10T17:11:16Z<p>I know that in transistors there is base, collector and emitter, and in FETs there is gate, drain and source, but what is the fourth grounded connection opposite the gate in this NMOS circuit?</...https://electrical.codidact.com/posts/286807Battery protection circuitStefanhttps://electrical.codidact.com/users/567482022-07-27T14:59:38Z2023-08-10T17:10:39Z<p>I am using two 18650 cells in series to power a RC car. Is the voltage goes below 6.2 V, the battery should be disconnected to prevent over discharging the battery. At the same time I want to im...https://electrical.codidact.com/posts/278933Battery backup voltage regulator (an invention story)Circuit fantasisthttps://electrical.codidact.com/users/534902020-11-02T12:16:28Z2023-08-10T12:07:32Z<h2>Goals and objectives</h2>
<p><strong>Motivation.</strong> Inspired that there is a place on the web where simple but clever circuit ideas are encouraged, I decided to share another 1-transisto...https://electrical.codidact.com/posts/279592How to create current sourcesCircuit fantasisthttps://electrical.codidact.com/users/534902020-11-28T10:04:34Z2023-08-10T12:04:04Z<h2>Background</h2>
<p>Constant current sources (simply, <em>current sources</em>) are useful and necessary devices. They are widely used to drive LEDs, charge capacitors and batteries, bias diffe...https://electrical.codidact.com/posts/278989ESD Protection - Differential Amplifier 2kindhttps://electrical.codidact.com/users/534692020-11-06T16:41:23Z2023-08-10T11:59:54Z<p><img alt="Circuit under discussion" src="https://electrical.codidact.com/uploads/sW2MvmGsPEMrtont8Pk3op9y"></p>
<hr>
<p><strong>More about the circuit</strong></p>
<p>The circuit is sensing (...https://electrical.codidact.com/posts/287772How Relay inrush current limiter works?deleted user#2023-01-24T12:23:42Z2023-08-10T11:58:00Z<p>In this circuit below the relay circuit part is acting as an inrush current limiter, but I can't understand how it works since the current is flowing in both conditions where the relay is open o...https://electrical.codidact.com/posts/288440How to change the polarity of an input using a single switch?DeadMousehttps://electrical.codidact.com/users/541412023-06-15T16:59:42Z2023-08-10T11:21:44Z<p>I have an mcu pin and I want to sense a voltage up to 24V to 36V.<br>
I want to connect some outputs on the board I'm designing and I don't know whether those outputs will provide a voltage or ...https://electrical.codidact.com/posts/283896Diode like a frequency mixerMissMulanhttps://electrical.codidact.com/users/541072021-09-01T16:43:16Z2023-08-09T21:54:48Z<p>Based on <a href="https://en.wikipedia.org/wiki/Frequency_mixer">this</a> paper on Wiki a diode can be described as a frequency mixer due to the exponential relationship between current and volt...https://electrical.codidact.com/posts/282711Diodes used in mixersMissMulanhttps://electrical.codidact.com/users/541072021-07-17T20:37:48Z2023-08-09T21:52:11Z<p>Suppose we have this circuit which is supposed to be an unbalanced frequency mixer. But how does the diode generate a signal with new frequencies at the output?</p>
<p><img alt="Hi" src="https:...https://electrical.codidact.com/posts/286030How do "O-ring circuit" differ from an "ORing circuit" or "OR-ing circuit", or are they synonyms?DavidCaryhttps://electrical.codidact.com/users/542652022-02-25T08:34:36Z2023-08-09T21:51:04Z<p>I've seen a few different circuits <a href="https://www.monolithicpower.com/en/simplified-usb-type-c-power-management-design-for-portable-devices">(a)</a> <a href="https://www.google.com/books/e...https://electrical.codidact.com/posts/286090Identification of semiconducting electrical componentsMissMulanhttps://electrical.codidact.com/users/541072022-03-10T17:33:35Z2023-08-09T21:48:40Z<p>We identify semiconducting electrical components this way:</p>
<p>The first digit represents the number of pn junctions inside the semiconducting device</p>
<p>The two or more digit number sta...https://electrical.codidact.com/posts/283325Adding resistance to varactor circuitMissMulanhttps://electrical.codidact.com/users/541072021-08-11T20:16:20Z2023-08-09T21:44:52Z<p>If we a varactor and we want to control let's say the resonant frequency of the circuit ,in my schematic we must add R1 correct?Else we create a low resistance path for current to flow not throu...https://electrical.codidact.com/posts/280393What should be considered when picking a flyback diode?Lundinhttps://electrical.codidact.com/users/81762021-01-11T11:25:56Z2023-08-09T21:39:22Z<p>Which are the parameters I should looking for when picking a flyback diode to be placed across a generic coil, such as a relay? That is: a coil with plain on/off functionality, for example a 24V...https://electrical.codidact.com/posts/276882Is it possible to use two zener diodes in series back to back to replace a diac?coquelicothttps://electrical.codidact.com/users/531102020-07-22T12:48:47Z2023-08-09T21:30:50Z<p>I've accidentally burnt my dimmer with a short. It is a common dimmer with a triac/diac/pot of the simplest configuration (the triac is a BTA16). After replacing the triac, this still does not w...https://electrical.codidact.com/posts/276649How do I calculate and manipulate the inductance and capacitance of outputs to a connector on a PCB?Hawk2020https://electrical.codidact.com/users/530652020-07-07T23:48:23Z2023-08-09T21:26:51Z<p>I am designing a PCB that has to have class 1 div 1 associated apparatus (only the outputs to the sensor) certification. Essentially, I am using a boost converter to convert the voltage from a l...https://electrical.codidact.com/posts/276257Chokes, Beads and Inductors in Pi-filterszekehttps://electrical.codidact.com/users/530092020-06-23T19:36:22Z2023-08-09T21:24:09Z<p>I have seen pi-filters using chokes, ferrite-beads, and plain inductors as the L-element
What are the main differences between them? when use one or other?</p>
<!-- g: js, mdit -->https://electrical.codidact.com/posts/280600Is a BJT 3-transistor Wilson mirror faster than a simple mirror?Pete Whttps://electrical.codidact.com/users/536612021-01-29T14:52:55Z2023-08-09T21:22:13Z<p>My question is trying to understand if there is an effect on the switching time, on both turn-on and turn-off, between the following configurations.</p>
<p>A mirror set up to switch a current, ...https://electrical.codidact.com/posts/281059How building a follower satisfying rather extreme requirements.coquelicothttps://electrical.codidact.com/users/531102021-03-16T08:28:41Z2023-08-09T21:19:44Z<p>What is your best suggestion for building a follower that would ideally satisfy the following spec:</p>
<ul>
<li>frequency: from 100 Hz (or lower) to 1 GHz</li>
<li>input signal impedance: 1 ...https://electrical.codidact.com/posts/286492Thévenins Theorem for Transistor Circuit kadamrohan16https://electrical.codidact.com/users/562022022-05-19T15:32:30Z2023-08-09T21:13:22Z<p>I am calculating the base current of transistor Q1. To simplify the circuit equations, I applied the Thévenin's theorem twice and converted V1, R1 and R2 into Vth and Rth, as shown in the image....https://electrical.codidact.com/posts/286950Technique to reset pulse transformer core quickly kadamrohan16https://electrical.codidact.com/users/562022022-09-02T11:34:41Z2023-08-09T20:46:20Z<p>I am analysing a pulse transformer which is required to transfer below communication protocol pulse from primary to the secondary side. The pulse duration is 32 μs and off time available to rese...https://electrical.codidact.com/posts/285814PNP Darlington pair as a current limiterkadamrohan16https://electrical.codidact.com/users/562022022-02-03T10:01:19Z2023-08-09T20:39:27Z<p>I am trying to analyse what is controlling the load current in the below Darlington configuration.</p>
<ol>
<li>Is it the base current of transistor Q3 which is controlling current through R14...https://electrical.codidact.com/posts/2790163-LED voltage indicator (an inventor's story)Circuit fantasisthttps://electrical.codidact.com/users/534902020-11-08T09:13:20Z2023-08-09T19:04:12Z<h2>Goals and objectives</h2>
<p><strong>Motivation.</strong> Having shown how a <a href="https://electrical.codidact.com/articles/278933">1-transistor circuit</a> can be invented, now I will demo...https://electrical.codidact.com/posts/278341Purpose of emitter resistor in a common collector amplifierjm567https://electrical.codidact.com/users/532992020-10-03T00:59:19Z2023-08-09T18:48:39Z<p>I see a lot of <em><strong>common collector</strong></em> amplifiers with the output taken across an emitter resistor.</p>
<p>What is the purpose of doing it this way instead of connecting your...https://electrical.codidact.com/posts/288874Floating circuitry and diodeskellogshttps://electrical.codidact.com/users/603992023-07-06T13:26:15Z2023-08-09T18:04:54Z<p>In both cases, is the "X" point floating when there is no 12V applied ?</p>
<p><img alt="alt" src="https://electrical.codidact.com/uploads/6h5e5kztn86s7yzlthsspi7semfi"></p>
<!-- g: js, mdit -->https://electrical.codidact.com/posts/286760Modelling tunnel diode relaxation oscillatorMissMulanhttps://electrical.codidact.com/users/541072022-07-20T13:18:55Z2023-08-09T11:33:32Z<p>I have been trying to model this oscillator</p>
<p><img alt="" src="https://electrical.codidact.com/uploads/NzcDCkE2ExtPVQnusohTcBg4"></p>
<p>I was wondering if we can somehow predict the freq...https://electrical.codidact.com/posts/283369Tunnel current equationMissMulanhttps://electrical.codidact.com/users/541072021-08-13T03:55:20Z2023-08-09T11:32:12Z<p>The current through the tunnel diode is:</p>
<p><img alt="hi" src="https://electrical.codidact.com/uploads/X3rZocCeWWRAVZJMqf9EyuqD"></p>
<p>where $I_{f}$ is the current from the Shockley diod...