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H: Linearity of power amplifiers
How are power amplifiers linear? Although they have some distortion they are still considered linear.
I tried referencing many materials, but I couldn't find an answer. The characteristics of transistors are non-linear for large signals and hence the output waveform for say a sine wave... |
H: Feedback impact of collector-base shunt resistor in common emitter amp stage
I made this 3 transistor Rf amp which works well at 10 MHz and has 50 ohm output impedance, a gain of 8.2 (18.3 dB) and quiescent curent of 28.6 mA. It consists of a common emitter stage followed by 2 emitter follower stages. (Credit: Nick... |
H: Has the user's guide for the UVM-IEEE-2020 framework been published yet?
I was able to find the User's guide for the UVM-1.1 and UVM-1.2 frameworks, but I haven't been able to find the same document for UVM-IEEE-2020.
There are of course resources posted at the Accellera's site such tutorials and videos that descri... |
H: How is the PASCO microwave receiver realized?
I took a physical lab course where I worked on the microwave PASCO set-up WA-9316.
Having a little background on electronics, I wondered how their microwave receiver works and found a more or less dated schematic. Here's the interesting part:
According to the document... |
H: Capacitor selection with current rating for switching regulator
The example design parameters in the TPS54332 datasheet are as follows:
In the input capacitor selection section, the values confused me.
Selected capacitors parameters are 10uF, ceramic X5R, 25V, 3mΩ ESR, 3A current rating.
But in ceremic capacitors... |
H: What causes a person to get 'blown across' the room in an electric shock?
Recently I came across this article of a man being 'catapulted' across the room: https://news.sky.com/story/desperate-man-was-dead-for-two-minutes-after-being-electrocuted-while-stealing-scrap-to-pay-bills-during-lockdown-12621745
This remind... |
H: Finding transfer function from Bode plot
While I know how to find the transfer function from the response graph, I don't know
how to find it from Bode plot.
What I know about the system:
The system is a second order system
The system has no zeros
According to the Bode plot, I estimate that there is a double pole a... |
H: What is the PE in 4P+PE connector mean?
I'm wiring a valve actuator to a connector for quick-disconnect purposes. The actuator has five wires so I thought of getting a connector that says 4p+PE, however I was told that 5p was needed.
I'm confused because I thought the 5th pin on the 4p+PE connector (the PE, I'm gue... |
H: Using fuse during initial tests?
I've implemented the presented 80W PFC boost pre-regulator in the following application note without using the applied fuse at the input. Surely I will add the fuse to the finalized tested circuit. But it was recommended to me not to use the fuse for early tests because it doesn't p... |
H: Dependent source circuit find voltage
Suppose we have this circuit
simulate this circuit – Schematic created using CircuitLab
How to do nodal analysis for this circuit?
Is it $$5-\frac{5-V_{A}}{2}-V_{A} = 0$$?
or $$5-\frac{5-V_{A}}{2} - 2 \frac{5-V_{A}}{2} = 0$$
EDIT
By
AI: You need to introduce \$I_M\$ into the f... |
H: Is this a "gapped" ferrite transformer/choke?
Here, two "E" cores are bonded together with brown epoxy. There isn't any intentional, visible gap, yet there are three bond points and that must introduce some gap...
How are these considered: gap or no gap?
Edit: There is no visible gap on the outer legs - if you zoo... |
H: Selection of voltage transformer and current transformer for protection in substation
having a 66/11 kV substation, how does one know which voltage transformer and current transformer to use? They secondary side would be connected to a distance relay for monitoring. I know they need to withstand the maximum continu... |
H: Explanation of Analog Input Module
I'm trying to wire this module. I'm just confused as to what the difference is between the two triangles and how would I connect them?
AI: That appears to be internal to the module, likely +24VDC and 0VDC. If so then you should only need to deal with the pinout on the left. |
H: What does a function mean that doesn't have "void", "int", etc in front of it mean?
I am following a programming build in Arduino and I came across this code here:
ISR(PCINT2_vect) {
hall3state = digitalRead(hall3);
NextStep();
}
ISR(ADC_vect) {
int x = ADCH; // read 8 bit value from ADC
OCR1B = map(x,0,255,1... |
H: MOSFET Driver Base and Gate resistors and other input stage for PWM motor control
I have the below basic pwm circuit for speed controller of a 12V ~10A motor -
I have seen this circuit but am unsure of how to select base or gate resistors. These should be to protect the gate from voltage spikes as far as I underst... |
H: LVDS voltage levels
LVDS terminology can be a bit confusing when noted that Vcm typically is 1.2V and Vd 350mV. Does this mean 350mV as in +/-350mV so (Vin+ - Vin-) is (2*350mV) or overall swing (peak to peak of a signal) is 350mV?
For example, in this diagram the typical swing is (+/-250mV-400mV) between the inpu... |
H: Some questions regarding measuring current using ACS712
I'm using an ACS712 0-5A current sensor to measure the input current to a boost converter for the implementation of MPPT algorithm. To do so, I need to connect the ACS712 chip in series with a PV voltage source. There are two questions I have regarding this.
... |
H: Turn an LED on/off LED with a flip-flop counter
I want to make a 7x7 LED matrix which begins to turn on the first one LED to the last and then turns off the way back (spiral matrix.) I'm trying to turn the LEDs on/off by using signal created by flip flop counter.
I have a MOD 15 synchronous counter using JK FFs an... |
H: Does anyone know what CJMCU on breakout boards means?
I have recently been looking at a lot of breakout boards and noticed they have CJMCU in their description and even printed on them.
Initially I thought it may be an acronym and then thought it may be a brand but I have not been able to find any information at al... |
H: What are the differences between these ferrite cores?
The ER, EC, and ETD ferrite cores are presented in a datasheet but visually I don't see any difference between them. The search results also say the same thing.
AI: EC and ETD are almost identical. ER is slightly different.
EC and ETD (ETD means economic transfo... |
H: Understanding the specs of an electronic ballast (UV-Tubes)
I got lost on the topic of selecting the right electronic ballast for 4 UV-tubes (Cosmolux S pink 15W). I have learned about magnetic ballasts and starters, about electronic ballasts and connecting them in series or parallel (or not).
Currently I am using ... |
H: Designing bandpass filter for audio amplifier
I am a 3rd year engineering student currently working on a project where I need to basically make an ultrasensitive metal detector.
Basically, I need to create an alternating magnetic field by connecting an audio amplifier (which is also connected to a function generato... |
H: Coupling 2 buck converter's output to increase output current
I'm quite new working with step-back converters, and I have to use them in the project I'm currently working. My board will have 24V/5A source input, and I want to step-down this tension to 12V, 5V and 3.3V.
The main voltage for the board will be 3.3 (th... |
H: Confused about chip antenna schematic and copper/GND from examples
I want to use a TDK chip antenna (ANT016008LCS2442MA1) on my board. There are two (design notes datasheet) technical documents, but they contain little useful infromation.
My questions are:
Ft-x and Mt components, are these supposed to be capacitor... |
H: Do I need back EMF protection for a small brushless cooling fan?
I am designing a PCB, and I want to add cooling to the project. To accomplish this I have added a connector for small (40mm x 40mm) brushless cooling fan that will draw off an existing 12V supply from a DC/DC SMPS.
Do I need to add any back EMF protec... |
H: Is there such thing as an inline ideal diode?
Probably a stupid question but I could not find an answer on the web.
I was looking for a diode to protect a 36V battery from a short circuit on the charging port. The best I could find (SB560-E3/54 and similar) have around 0.5V forward drop. That is a lot of heat at 2A... |
H: What kind of LEDs are used in this lamp?
I have many of these lamps in my home.
They are sold as being LED lamps, but I do not know the proper name of this particular type.
Once I had one with the glass bulb broken and removed I got curious and measured the resistance of a stripe: to my surprise all four were open... |
H: Which connector is this three connections inline XS 20 marking
I can't find the connector type of this part found on alibaba for which I need its mate.
I have it in front to me. body is 300mil width and about 200mil thick.
Pin spacing 2.5mm (NOT 100mil!!!!)
There is a marking of XS 20 on the side of the connector.
... |
H: Buck Converter - Output Current Ripple
I have a follow up question to this question posted here
Why dc component I must flow entirely through the load resistance R in buck converter?
I know now that the DC component of the inductor current flows to the resistor, creating a DC voltage V.
The AC component of the indu... |
H: Optimizing Peltier water cooler set up
Application
20 gallon aquarium cooler
Ambient temp: ~22C
Tank target temp: ~17C
Tank houses an axolotl and needs to be kept at cooler temperatures then currently in the basement.
Current Peltier Set Up:
(Top to Bottom):
80x80x38mm fan running at 5700 RPMs and 76CFM
80x80x20... |
H: Specify and connect one power supply for two applications
I have a 1980s chess computer to which I have added a Raspberry Pi 2 Zero to provide display and speech capability via a Python. It all works via serial messages and the only electrical connection between the two is an RS232 to USB adapter.
The chess compute... |
H: 5V Input and Output interfacing with 3.3V GPIO
I have a device (a motor drive) with 5V logic. My controller is 3.3V.
I draw the two circuits. The right sides are fixed in the device.
I have some exact questions about calculations.
-Q - What to look when selection a transistor for this applications? Some rule of thu... |
H: How to calculate the current through the LEDs/the collector current in the BJT circuit
For this exercise I have to calculate the voltage Vce and the current through the LEDs. The LEDs have a knee voltage of 2 V, the transistor has one of 0.7 V. Beta has been given as very big.
To start I calculated the Vce simply ... |
H: Op-amp boost pedal tonal noise
I am working on a boost pedal, but I can't seem to find the cause of a humming noise in the circuit.
I tried bigger caps for C5 and C6, but it didn't solve the issue.
For power I use an 18V model train power supply (it's the only supply I have now.) I divide it for the TL072. The 6V ... |
H: How to design a circuit that will trigger after a specific delay once a push button is pressed
I wanted to make a circuit in which a push button is pressed once and then the system should wait for a small period of 10 seconds and then give an output pulse of a second. I am looking for a cheap alternative by using a... |
H: finding replacement for resistor labeled as fuse in schematic
I am trying to find a replacement for what appears to be a burned resistor in a power supply unit. It appears to be labeled as "F3" on the PCB which is the designation for a fuse. As far as the reason for the resistor blowing up, based on other testing ... |
H: What is this solar path light component?
Just for fun and curiosity, I decided to reverse engineer an old, cheap solar path light. It's a fairly simple circuit, but there's a component I can't find any information on. It has transistor-style package with four leads. The markings are 6608A H13006. A Google search yi... |
H: How to properly start an induction motor using a variable frequency drive?
I've seen on several websites that a variable frequency drive (VFD) can be used as a starter for induction motors, but didn't find any details calculation on what should be the starting frequency.
In a typical delta-star starter, the start ... |
H: In-Amp Common Mode Rejection With Unbalanced Device Impedance
I am using an instrumentation amplifier (AD8220) to interface a pH probe. The pH probe produces a +/-414mV signal with large output impedance (>100MOhm). AD8220 has very low input bias current (~10pA) and low offset voltage (~500uV).
When I simulate wit... |
H: +/- 12v supply for AD8421
I need +/- 12 Vdc power supply for AD8421 from 5 Vdc. Can I use LT3582 (with output +/-12 Vdc; 85 mA) to supply the AD8421?
Thanks.
AI: It can supply the +/-12 without an MCU to set it up if you get the LT3582EUD-12. Assuming you can actually find any in stock. Otherwise, looks like you'd ... |
H: Automatic voltage selection using SPDT relay
I'm working on a design with two voltage inputs and I need to give priority to one of the two inputs when both are plugged simultaneously. Both must also work individually.
the first input (V1) is from a battery (12VDC)
the second input (V2) is from an AC/DC powersupply... |
H: Simulating a four transistor audio amplifier circuit in LTspice
I'm designing a four transistor audio amplifier circuit.
I simulated it in LTspice. I replaced the BC547 with a TIP142 and the BC557 with a TIP147.
Collector
Base
Emitter
When run mode V out is not amplified.
,
What is the problem here?
AI: The BC5... |
H: Multimeter resistance measurement
I was doing a short and resistance test in my circuit on testpoints. I was testing the output of a voltage regulator.
When I place the + probe on the power and - probe to ground the meter takes time to find the correct range of resistance until it reaches around 200 kohm, when I re... |
H: Controlling external device by tapping into existing transistor
I'm working on one project where I cannot figure out on how I can control my external device by tapping into some home appliance. Just to note, that I have very limited knowledge of electronics and I learn by practice.
Here is the circuit of my control... |
H: Different behavior of new() constructor
I'm trying to understand a reason for the different results between the usage of the new() constructor in SystemVerilog.
I understood that if once the constructor allocates the memory into the object by new(), then I can use it in a class. I don't need it anymore after constr... |
H: How to implement unity gain buffer with long-tailed pair?
I read that a unity gain buffer can be implemented with an op-amp like in this circuit:
I also read that a long-tailed pair as an op-amp (this might be the wrong part). So according to the buffer circuit above, I believe the circuit using long-tailed pair wi... |
H: determining the Bmax for inductor design
at this moment of this youtube video following graph is presented for selecting the proper maximum flux density.
the considered proper amount of core loss is 100mW/cm^3. is this a general amount for all cores or does it change according to each material datasheet? should it... |
H: What are the advantages of a series emitter follower circuit for power supply?
I saw a power supply made of many series emitter follower circuits.
The input voltage is about maximum 480VAC.
I understand the circuit of single emitter follower power supply concept, but I don't know why many series emitter follower c... |
H: Convert speaker level to microphone level
I have a digital piano without line output (not even earphone output) but I would like to record what I am playing. So I decided to convert the speaker level to mic level so I can record the audio in my smartphone (using the bultin TRRS input of my smartphone).
My piano spe... |
H: Controlling a 12V solenoid lock with 3.3V - IRLZ44N
I would like to drive a solenoid lock from a 3.3 V MCU with a N-channel IRLZ44N MOSFET.
Here are the specs and diagram:
Solenoid Lock: 12 V – 2 A (K02-12V DC 2A Electric Magnetic)
Below is the diagram where:
VCC: 12 V (Korad KA3005D Power Supply)
SV1_CONN: Soleno... |
H: Hacking a trail camera
A quick warning, I have no prior knowledge in electronics. I don't even know if what I'm asking is doable.
Here is the idea. I was given an old refurbished Reconnyx Hyperfire 2 camera trap. The flash doesn't work anymore but the logic seems fine.
I would like to reuse it by bypassing the came... |
H: I2C Hot Swap design and feasibility
I would like to hear if someone has successfully implemented a working connectable/disconnectable I2C interface. I'm working with the back plane (host device) and am looking into implementing a I2C buffer/switch to be able to connect and disconnect a single I2C sensor without han... |
H: Best way to make a system which is both 120 and 220 Volt compatible
I am currently preparing a piece of equipment that needs to run of both USA 120 volt and euro 220 Volt. I am running a 120 volt AC vacuum pump and a 6.3 volt transformer to provide 6.3 volts to a resistive heater. I imagine a switched 220 to 120 vo... |
H: Can a K-type thermocouple measure both air and surface temperatures?
I want to use a K-type thermocouple to measure exhaust gas temperature and surrounding structure temperatures for my micro turbo jet engine.
I read in the comments of How to use MAX6675 thermocouple k type with Arduino video the following:
From w... |
H: Using Jfet as constant current source to drive a BJT
The circuit diagram below shows two simple voltage regulators, one of them is driven by constant current source using a Jfet and the second one also providing a constant current because the voltage is constant.
What is the benefit of using a Jfet in a circuit li... |
H: Resistive current sensor shows reading when I connect it in series with a battery while no current is flowing through it
I need to monitor the charge and discharge current of two 12V lead-acid batteries in series using an INA219 current sensor, and a 0.75 mOhm shunt. At first, I placed the current shunt in the low ... |
H: Why is there current flowing through the resistor R1?
I came across this problem in a book. In the question, one has to determine the current through resistor R1 as a function of the input current, while assuming a constant voltage model for the diode D1 (800mV voltage drop when it turns on.)
As far as I know, whe... |
H: Why does the LED turn off when I try to measure current?
I have the following circuit:
simulate this circuit – Schematic created using CircuitLab
I'm trying to measure the current in it, which should be
\$\frac{\text{5V}}{\text{220}\Omega} \approx 22 \text{mA}\$
The problem is that, when I put my multimeter in, th... |
H: Multiplication 32x32 Mealy machine using 16x8 multiplier Verilog code
I am trying to implement a multiplication 32x32 Mealy machine using a 16x8 multiplicator in Verilog. I wrote the arithmetic part and the FSM part + a code to connect both and a test bench, but when I am trying to run it in Modelsim, it seems like... |
H: AM demodulation circuit doesn't work
I'm designing AM modulation and demodulation circuits. The AM modulation works fine but when I connected it to the demodulator (I'm using envelope detection) the modulating signal changed to the original message.
Amplitude modulation circuit design:
The modulation output
the f... |
H: What's the purpose of the band-pass filter in an RF transmitter?
What is the purpose of the marked band-pass filter?
AI: The output of an AM (Amplitude Modulating) mixer contains a number of frequency components. These components are 1) the modulating signal. This signal is typically audio frequency, and in the dia... |
H: Why do we need nonlinear electronics for computing?
When I read about photonics, I always see that they can be used for linear transformations (just matrix multiplications), and that this is a limitation that makes them unsuitable for building a complete photonic microprocessor. Why are linear transformations insuf... |
H: Relation between signal mixer and filters
Mixer output shown as red wave:
Can a band-pass filter be used to remove the low frequency shown as a blue sine wave and leave the rest high frequency just like the frequency shown as a green sine wave? If so, which band-pass filter provides the most proper output (most re... |
H: Why is my maths saying that increasing turn count will decrease magnetic field strength in an AC coil?
I’m trying to make a device that can propel rings of conductive material upwards and make them hover, like the one seen in this video at 6:24, albeit on a smaller scale. I got a stepdown transformer to 24-volt AC ... |
H: Can you use a DC brushless motor as a torque motor?
I've got an outrunner brushless DC motor (Flipsky 63100 190KV 5500W if that's relevant). It'll be used to spin normally sometimes, but I also need it at other times to give resistance to motion.
Basically, I'll be running a current through it to spin one direction... |
H: Humming sound when not touching wire
I explained this problem in a video so you can see with your own eyes the problem... touching the GND wire makes the problem go away, however touching the signal wire creates the problem. Even touching the signal wire from the plastic it still creates the problem.
https://photos... |
H: Is it safe to PWM control a consumer smart plug or smart switch?
I was looking at a project that controls the speed of a normal off-the-shelf AC-powered house fan by plugging it up through a consumer smart plug (specifically, the Kasa ones, if that matters) and effectively pulse-width modulating its speed by turnin... |
H: Why is this boost converter circuit outputting a lower voltage than expected?
I'm working on a boost converter board to power an OLED display, specifically a Midas Display MCOT128064SV-WM, off of 5V USB bus power (the VBUS pin on a Raspberry Pi Pico powered via USB).
I referenced this TI WEBENCH design:
I had thi... |
H: What's wrong with level shifter output?
I was trying to understand what wrong about the output of the level shifter, the level shifter is part of my circuit that I trying to bring-up and encountered difficulty in this issue.
This is the circuit:
OE controlled by FPGA, the 5V and 3V voltages works well in other com... |
H: Which edges (h->l or l->h) does this circuit detect?
Which edges (h->l or l->h) does this circuit detect? When I simulate it, the output voltage is constant, so it does not seem like it would detect any edges, which I did not expect.
AI: Edit: Andy aka has pointed out that the outputs of A1, A2 and A3 are always hi... |
H: How does a TTL gate input strain an ALS-TTL gate output, and how does it strain a CMOS gate output?
How does a TTL gate input strain an ALS-TTL gate output, and how does it strain a CMOS gate output?
Or do you maybe know where I can find resources on the topic?
AI: The datasheet (here of the SN74ALS04B) tells you h... |
H: Effect of antenna direction on antenna gain
I'm studying antenna theory right now, and I have a question about the effect of antenna direction on antenna gain.
My assumption of the antenna direction is like below:
Since the Rx antenna cannot get the signal from the Tx antenna, I thought receive antenna gain would ... |
H: The structure of the loaded circuit in Thevenin's theorem
If the load in Thevenin's theorem happens to be a circuit instead of a single resistor, must this loaded circut contain only resistors or may it contain also voltage or current sources, etc.?
AI: Let's assume you have any circuit named X which contains volta... |
H: LED on off delay (without an Arduino)
I'm new to electronics but I want to put delay on a circuit without using an Arduino. I do have a Raspberry Pi 4, but I would like to try without using it. When I was looking on the internet I saw people using a capacitor, but they also used an Arduino.
What I want to make as s... |
H: What is the purpose of button like blinking
My father was an electric engineer who passed away 12 years ago. Today I found this component in our house, it works with two LR927 batteries. There is no cable (only a cotton like rope attached to the back panel) or button outside of the thing. If you close the back pane... |
H: How to infer resistor size from the manual of this microcontroller board?
I have STM32's NUCLEO-F302R8 board. The manual is given here. I couldn't find any PCB design file for this board so that I can open it in KiCad, Eagle,etc..
From the manual I couldn't figure out the resistor sizes on the bottom layer for the... |
H: Are antennas specified for a certain frequency?
"LTE 868 MHz Antenna" Why does 868 MHz stand for? Are antennas specified for a certain frequency or is it necessary for something like input type? For example, I want to transmit a 40 MHz RF signal. Can I use an 868 MHz or 2.4 GHz antenna to transmit? Or am I supposed... |
H: Should a 5V wall adapter output 150V pk-pk AC relative to earth?
I've recently bought a wall adapter off amazon which claims to be able to output 5V @ 2A. I tested this adapter by connecting a probe to the +5V output, and WOW! My scope shows a 150V Pk-pk 60 Hz... RC-like curve. In this case I connected the ground ... |
H: For below circuit, the simulation result is not matching with theoretical prediction
Please note that i1(t) is the loop current (in loop analysis method) and not the inductor current.
The answer to above problem is option B, which is derived below
Following principles are used:
Capacitor acts as an open circuit ... |
H: How do MOSFETs in 300-500A ESCs handle the current?
I’m trying to build an elecyronic speed control (ESC) for a boat that requires a massive amount of continuous current flow. I’m trying to also design the ESC my self.
I need to supply 50 V and 300 A to the motor continuously,but when researching MOSFETs, I can’t s... |
H: Do gate level simulations have any utilitly in the current highly complex digital circuit designs?
Gate level simulation involves taking a netlist and annotating it with the delay information from a layout of the circuit. This information can be obtained after the floorplan and layout of circuit has been completed.... |
H: What is the MCU-Pinmode equivalent of a button-press to ground in this scenario?
The more I think about it the more I confuse myself... In the attached circuit if I want to simulate the effect of SW1 (or SW2) closing to ground how do I set the MCU-pin? Connect to Terminal 2 of the SW to one MCU-pin, and via Pinmo... |
H: Microchip CanBus Bootloader J1939 - Multiple devices programmed in parallel
Bonjour,
I have a project where I need a canbus bootloader. The device will be wired on a J1939 bus.
Multiple of my devices can be on the same bus.
Now Microchip gives an application note (AN247) but apparently there were problems with it a... |
H: Flyback converter small-signal model
I am currently designing a flyback converter and I am interested in measuring the stability of the converter (with a Bode plot). I will try to connect an isolation transformer on the feedback loop that inject a small AC signal and measure the transfer function with an FRA.
Howev... |
H: EMC pre-compliance test in the lab
I would like to test the EMI performance of our product in our lab. I have access to a small shield box, a spectrum analyzer.
Should I test the device inside the shield box to isolate external noise?
If I test the test outside the shield box, how should I factor out the ambient n... |
H: Is it true that for asynchronous clock domain crossing, there is always a small chance that data will be lost or corrupted?
There are several techniques that can be used to transfer data between two asynchronous clock domains. For a few bits, and depending on direction of data between the two clock domains, one cou... |
H: Why isn't my application of KVL working here
Firstly, please note that this is a high school level, physics question, but as this is related to circuits, I feel this is a better place for such a question than PSE.
The image is from byjus and first appeared in jee mains 2020.
The question is to find the approximate... |
H: What is the correct unit to specify throughput of an RTL block?
There does not seem to be an agreed way to calculate throughput for digital circuit design which is confusing. I am talking about front end design i.e RTL coding. The data rate can be represented as number of bits per clock cycle after an initial laten... |
H: What is the function of varistor in this design
Came across this on internet. The description mentioned this module help prevent relay stick to the contact. Please explain why varistor need to be included in the design if it is to connect in parallel to relay contact.
AI: If you are driving an inductive load, and a... |
H: Is there a good way to insulate the backplate of a 7915 voltage regulator?
Didn't realise this when I purchased it, but apparently voltage regulators come in two different housings:
I.e. one that has a metal backplate connected to the input pin and one with a non-conductive backplate. The cooler to which I was pla... |
H: Help identifying possible faulty transformer
I am trying to identify this component removed from a Mean Well PB-120N-27C charger.
In this picture I see two pins (bottom left) connected to two small wires. They are shorted. Same thing for the other side. Could it be a broken internal fuse?
Do you have any suggestio... |
H: For a switching boost regulator, will putting the inductor on the bottom side of the PCB cause issues?
I'm working on a 6-layer PCB with dual-side component placement. To help assembly, I'd like to keep all of the "large" components on the bottom side of the board. One of those large components is the inductor for ... |
H: Shorting the USBLC6 ESD protection pins
I am using USBLC6 IC to USB pins for ESD protection. In the diagram in the datasheet, I see that pins 1-6 and 3-4 are shorting. I also want to shorting these pins on the PCB so that the circuit works without using this USBLC6.
However, in the example pcb layout image on page... |
H: Does it make a difference if I use 8MHz or 16MHz crystal for PIC18F47J53
I'm using a PIC18F47J53 in a project. Because I need to use Full-Speed USB 2.0, I can't use the internal 8MHz oscillator because it's not stable enough (*). Although Microchip has a lot of interesting application notes on Oscillator design (FA... |
H: Can't upload firmware on ESP32-WROOM-32UE with CP2102N
I designed a custom ESP32 board with a CP2102N bridge (schematic attached). I'm using an ESP32-WROOM-32UE. My schematic is based on the ESP32-Devkitc-V4 board from Espressif (schematic attached). When I plug the board to my computer (with VCC connected to a 7.2... |
H: WiFi Module Heating Issue
I salvaged an RTL8188ETV WiFi from an old tablet,
I connected usb wires and used AMS1117 3.3V Regulator, it works fine for some time but heats up and looses connectivity, Regulator is tested to be fine including all connections, it heats up with or without stock antenna, tried with a smal... |
H: Do I need via shielding for the GPS antenna trace?
I'm working on a 4 layer board (signal, GND, PWR, signal). I have a NEO-M8P GPS module and the Hardware integration manual says to connect the antenna with a 50 ohms impedance trace to the connector which I did. I've also been reading and watching videos for best p... |
H: Determining Headers and Connectors
I'm doing my first non-kit electronics project for computer controlled fans for my electronics closet. The person who posted the project said to use JST headers. There are two four pin connectors for two Corsair LM120 fans. There doesn't appear to be a data sheet for the fans so I... |
H: Is it safe to discharge li ion below 2.5v?
I accidentally discharged my samsung inr18650 25r, 20A battery to 1.5V. Is it permanently damaged? I quickly charged it back to 3.7v using 0.5-1A charger but I'm not able to figure out if there is a significant damage to cell or not.
AI: Li-ion cells usually work in the ra... |
H: Why does adding "& 1" to an assign statement produce a completely different synthesis?
I am trying to implement a one-bit full adder in Verilog. Here's my original code:
module add1 ( input a, input b, input cin, output sum, output cout );
assign sum = (a + b + cin) & 1;
assign cout = ((a + b + cin... |
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