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H: How to find what is eating up current in electronic circuit?
I have 2 exact electronic circuits, with one malfunctioning while the other is functioning. The total current consumed by the malfunctioning circuit is 0.48 A, while the functioning PCB has 0.271 A.
My question is, how can I know which parts in the PCB is... |
H: Simulation of MOSFETs as high-speed switches
I’m trying to simulate high-speed switches (2xSPDT) made of MOSFETs.
The MOSFETs should switch so that while “I2” flows into output, “I1” flows into “U_1” (or vice versa).
I couldn’t interpret the behaviour of the currents flowing into the output. Did I cause an error so... |
H: How to find nature of RLC circuit?
If a resistance value, XL value and XC value are given, how do we determine the nature of the circuit (whether it's capacitive, resistive or inductive)?
The only thing that comes to my mind looking at the 3 given values is the impedance.
Is there any specific formula or any other ... |
H: Why are Li-ion batteries not being used in aircraft but are widely used in electric vehicle market?
This might seem a very naive question. Maybe the comparison of electric vehicle to aircraft is hugely inappropriate. But I couldn't find a clear answer in web search.
Lithium-ion batteries have a high power-to-weight... |
H: Getting electric power to a pivoting front door
I have a front door which I want set up with electronic unlocking. Ive ordered a compatible motor for my system which requires 12v DC plus a separate 12v pulse to operate the mechanism. This all fits inside the door. The problem is how to get power to the motor bec... |
H: Placing the BPF and impedance matching on the output and on the input
I am working on solving a problem, namely I need to add input and output matching to my circuit and I am not sure where I should put them. Additionally, in the circuit I want to use a bandpass filter at 2.4 GHz - should it go before the output ma... |
H: Making duty cycle with CTC mode in AVR without using interrupt
I am writing a program to make an output with a 30% duty cycle and a frequency of 3 kHz using an ATmega32 microcontroller. My controller's frequency is 8 MHz and I am going to decrease it to 1 MHz by using a prescale of 8.
I need to utilize the CTC mode... |
H: Power indicator LED for 230VAC light circuit
I would like to add a (power) indicator light (LED) in box where a 230VAC light is switched on.
The issue I have is that there is no "neutral" line in the switch box (to put the LED over). It only opens or closes the phase line.
To me, the only way would be to put a ligh... |
H: LiSOCl2 battery EOL monitor review
I'm working with a device which will use Lithium thionyl chloride (non-rechargeable) batteries as a backup source; their discharge curve is quite flat and AFAIK you can't tell how is the battery in terms of whether it's good or about to die (EOL) unless you apply a dummy load. The... |
H: Why is voltage and current at a node 0?
I am studying through Kirchoff's current law and following with a multimeter.
As per the law, I could see the current entering and exiting the node is same, 0.17mA. Also the voltage is 2.56 volts.
Voltage before node
Voltage after the node
When I measure the voltage at the... |
H: Thermocouple K Type using a jack plug instead of the normal connector
I have a few thermocouple K Type using the classic two lead connector.
I would like to change that connector to a male jack type like this:
So I can connect it to the female connector that has waterproof cap:
The problem is that the jack conne... |
H: What happens when a capacitor gets a current over its rated current?
An example capacitor is rated 400 V and 5 A.
What would happen to it, if it was given a continuous current at e.g. 50 A?
Would there be Thermal Runaway as would happen with a battery that is fed a continuous current that is too high?
AI: The curre... |
H: Where is the third antenna on this avalanche beacon PCB?
I have been looking at the pictures of the internal circuitry of a Barryvox S avalanche beacon on the FCC ID website. I cannot open mine, since that would void the warranty.
This beacon, as all modern ones, features three antennas aligned with the three axes ... |
H: Finding output power of a three-phase inverter from V and I
I have made a simple three-phase inverter in Simulink. I have the output waveforms for the line-voltage and current as shown below, where the voltage is in plot 1 (I have split the waveforms for clarity) and the current is in plot 2:
This is as I expected... |
H: Help identify IC
This is an LED light from AI, PRIME 16HD model.
I have identified the IC that seems to be burned; it looks like it's some kind of voltage regulator. I think the markings are: BN0D 18.
Maybe someone can identify it. I googled for it and obviously couldn't find anything. I sent a question to AI su... |
H: Finding Phase Angle
How would I go about finding the phase angle at different times?
For example at 50 Hz with a full cycle time of 20 ms I know at 10 ms the phase angle would be 180°.
What calculation could I use to find the phase angle based on how many milliseconds I am into the cycle?
AI: Assuming at t=0 you ha... |
H: Can a push button with a single click using an Arduino have more than one function?
I've tried to google this and failed, but I am trying to figure out if I can use a momentary push button and some controller like an Arduino UNO (which I have) to activate two LED lights, one after the other. My example, say I push ... |
H: Possible problems of AC energy metering using rectified waveforms
I'm building an energy metering circuit with discrete parts and precision is not a big deal in this case. One friend had the idea of rectifying both the voltage and current waveforms before sampling them with a MCU. His idea is the following: we put ... |
H: Possible fixes to a power supply thermals issue
The question applies to a buck converter design on my board:
Here is a 3D view of this section:
Layout of this section:
L1:
L2:
Layer 3 is power and layer 4 is again a full ground plane.
Here is the Webbench link to the design i was trying to follow:
https://weben... |
H: Can I connect a DC-DC step-up converter to a DC-DC step-down converter in series?
My problem is I need 3A at 5V from an 18650 cell.
I bought a DC-DC converter that should do that, but they are garbage specifically the XL6009 it seems that they'd prefer to operate in high voltage vs. low. They come around 40V stock ... |
H: How do appliances change their resistance when voltage changes?
Assuming all connections are DC (avoiding any RMS, phase, and impedance calculations), if the power of an appliance is constant, and I change my country from a 240 V to 120 V one, my appliance will draw more current in the 120V country.
For that would ... |
H: I2C seems to work but all register reads return 0s
I'm debugging an audio codec WM8962B via I2C. I wrote basic code for a manual I2C read operation of a given register. I'm using PSoC 5LP to do it.
The 7bit slave address is 0x1A and I'm trying to read the device ID [CUST_ID] and [CHIP_REV] to make sure my interface... |
H: Would there be any safety issues if the input voltage on the primary coil is bigger than what the rated voltage is?
I have a neon sign transformer that converts 120 V to 12 kV which is the rated voltage. Using the 1:100 ratio would it be safe to have the input voltage be 140 V converted to 14 kV when the specified ... |
H: Are USB cables active circuits?
I always assumed a USB cable between two devices is just a collection of wires. I recently saw some pictures when shopping for cables indicating they have internal circuitry.
Could someone clarify if USB3.0 cables are only wiring or is there an active device within the A end?
AI: Dep... |
H: How to calculate the GDDR5 Capacity from this table?
How to get 4Gb capacity from this table?
I understand it this way:
(1) total address is 14 + 6 + 4 = 24. each address (atom) is 32bit. So total capacity = 2^24 * 32bits = 512 Mbit.
I am not sure where is the 8x factor missing from the calculation.
Best,
Neo
AI: G... |
H: How to string compare const uint8* in a ESP32 microcontroller chip
I'm sending data from an ionic app (typescript) to an ESP32chip. Data from the app uses protocol buffer format. Here's the code:
this.provisionMgrAction.setAction('stop');
let bytesOfStuff = await this.provisionMgrAction.serializeBinary();
BleClie... |
H: How can a slave device (microcontroller) communicate with a master device (Raspberry Pi) in SPI communication?
I saw several posts for SPI communication where they only explain that if a master wants to communicate with a slave, it will turn the CS/SS line low for the respective slave device.
In my application, the... |
H: What is the function of " *| " operator in Verilog?
What is the function of the "*|" operator in Verilog?
parameter LANES = 4,
parameter CONVERTERS = 4,
parameter SAMPLE_SIZE = 16,
parameter SAMPLES = 1
wire [SAMPLES*SAMPLE_SIZE*(CONVERTERS+(LANES-CONVERTERS%LANES)*|(CON... |
H: Is it possible (and worth it) to store non-const program data in FLASH rather than in RAM?
I'm the situation that my program stack variables take 24kB, and global variables take 27kB. My MCU's SRAM is only 40kB.
Would it be possible to store part of the data anywhere else? For example, in FLASH memory.
AI: Since ma... |
H: How many times can a register bit be changed in AVR?
I am writing a program for an ATmega328P.
I have a while loop inside which I am enabling the UART receiver complete interrupt flag using the command UCSR0B |= (1 << RXCIE0).
In some conditions, the while loop will execute infinite times. Does setting the receive... |
H: USB Power Inside of Freezer / Fridge
Background of the project:
I am doing my own DIY Keezer (keg freezer) which basically turns a chest freezer into a fridge that will hold kegs with the assistance of a temperature controller. The temperature controller plugs into the wall, the freezer plugs into that, and the tem... |
H: Can step down transformers malfunction in such a way that they become live?
I know a few things about electronics, but transformers are still an unknown for me. I know AC to DC converters use them to isolate live voltage from the DC output, or at least I think that's what they're used for.
Dumbed down, the transfor... |
H: How to implement a ground loop isolator in an audio circuit that connects to USB and line out of a laptop?
I'm working on an audio interface that utilises a microcontroller and a CS42448 audio codec. When receiving USB power and receiving audio from a laptop, there is a ground loop. Otherwise, it works fine (like w... |
H: LTspice - Staircase saturation transformer
I am trying to simulate on a full bridge converter a staircase saturation transformer. I was thinking by adding a very little resistor on one leg of the full brigdge converter, it will in any case saturate the transformer. It would have shown that what ever the magneic mat... |
H: Christmas lights in series with one broken bulb
I read this about Christmas mini-lights in series: "When one bulb's filament breaks, current stops flowing, so the remaining lights go out, and the full 120V appear across the broken filament. This means that even though the bulbs are designed to operate at 2V, they h... |
H: Best way to "cut" a connection on a pcb
Imagine you have some traces on a PCB, that connect from point A to point B.
I would like to have control over that connection. I want to be able to enable/disable the connection from a distance (microcontroller included).
What is the best way to enable/disable the connection... |
H: Can I use this US extension cord in Europe?
Long story short: I need an extension cord to charge my EV when the standard charger does not reach the socket. I spent hours researching what options I have and most review websites I found were US-based. The most highly recommended extension cord was this bad boy:
https... |
H: About power dissipation of capacitors and inductors & I-V phase difference
For instance, The Art of Electronics (by Horowitz & Hill) states that
ideal capacitors cannot dissipate power, even though current can flow through them, because the voltage and current are 90° out of phase.
This reasoning has always baffl... |
H: Bipolar stepper motor doesn't spin but vibrates
I got a problem with controlling a bipolar stepper motor. It doesn't spin but vibrates.
Here is the schematic of my stepper driver:
DVDD supplies 5v DC.
Here is the wiring map from the motor's specification:
here are the motor and how I wired it up to my PCB:
Ther... |
H: Interpreting spec sheets for an inverting op amp
I'm interesting in putting together an inverting op amp to take a signal voltage from 10 V to 0.01 V (Gain = -60 dB). By signal voltage I mean the current input and output will be low (e.g., <1 mA).
Searching suppliers, I haven't found an op amp where their gain plot... |
H: Why can't I use a 12 V DC power supply, voltage divided to get a 9 V drop across a resistor, to power a 9 V DC motor?
I have a 12 V DC power supply and a 9 V DC motor available to me. I want to use the 12 V power supply to power the 9 V motor, and I expected I could do this with voltage division.
I built this circu... |
H: Simulating a single ended to differential circuit not working as intended
I am trying to simulate the circuit recommended in this TI article.
However, my simulations are not matching what is expected. What I am doing wrong?
AI: Your differential inputs are not at the same DC input and the output is clipping, trying... |
H: Finding a pass-through demultiplexer with latch/register on output
I'm currently working on an Arduino project with lots of digital IO (21 outputs, 8 inputs) and no analog IO. This is more than the number of digital pins on an Arduino Nano, so I started looking at muxes to expand the number of output pins. I quickl... |
H: Spanning the voltage gap between microprocessor and P-MOSFET
I need to control a high-side FET from an STM-8, to enable solar charging of 2x18650. The only pins I have left are PD4 and PD5 which are true open drain outputs: that would be perfect if I could use them to drive the P-MOSFET directly, but the pin voltag... |
H: Do 1MHz 3.3V through-hole oscillators exist?
I'm beginning my first MCU project and I'm having trouble finding a suitable oscillator. I want to run an ATtiny261 at very low power. It will be lighting up different combinations of LEDs based on look-up tables, indexed by analog sensor ranges. The data sheet advises u... |
H: Circuit type that uses three operational-amplifiers
I was given a problem-based learning assignment that told me to find and explain the *circuit that consists of 2 or more LM741 op-amps. Based on my research, I only managed to find a "three op-amp instrumentation amplifier." That's a circuit structure that can amp... |
H: Question regarding wiring setup for a battery balancer
Given this schematics (it is a battery balancer for 6 x 12V lead-acid battery, wired so we have a 24V system).
Can someone please explain me why the inner black wires (the ones connecting + to -, so we link the batteries in series) are connected between them?
... |
H: Why doesn't the voltmeter show the charging voltage when connected to a solar controller's battery connection?
My understanding is, for charging to occur, a solar charge controller needs to output at a higher voltage than the battery's voltage.
If so, why, when you test the battery connection of a solar charge cont... |
H: DRV8801 H-Bridge : need for freewheeling diodes?
I'm designing a PCB using a DRV8801PWP.
However, I'm a bit unsure if I need to add freewheeling diodes myself or not.
In the typical applications, they don't show them, but I didn't found either an explicit mention that I don't need them.
Some information that might ... |
H: Turn on an LED using opposite sides of 2 different batteries
I know this is a very beginner question but I'm not even sure what to lookup to learn about its details, so here it goes.
Why won't this turn the LED on? does't the current flow from positive to negative?
Why can't positive side of a battery move to the n... |
H: Downconversion using frequency divider vs. mixer
Let's say you have a 1 GHz signal that you want to receive and demodulate. I am familiar with the superheterodyne receiver, where an LO of 1 GHz is mixed with the RF signal, and the output is then used.
On the other hand, it seems that we can also use a frequency div... |
H: PCB tracks as wide as possible or just as wide as needed?
what is the best practice regarding the width of PCB tracks?
There are of course a few hard constraints :
wide enough to keep voltage drop acceptable
wide enough to prevent excessive heating
at least as wide as the minimal width allowed by the manufacturer/... |
H: Pull output down if either of multiple pins are pulled down
(Sorry in case I used the wrong terminology, let me explain.)
Context
I have a relay board I'm controlling. It has 8 relays, and 8 low level triggering pins for control.
7 of the relays I want to control separately from each other, while the 8th should tri... |
H: HP 8568B J1 Connector identification
Can anyone identify these 4 individual RF connectors? I think it's some sort of RP-SMB, but it could be something more foreign. I would need to buy 4 cables to connect up the spectrum analyzer.
Digging through ebay, the expected connector looks like this:
The original cable is... |
H: SMD "power" resistors : what constraints on PCB layout
I'm looking for current sens resistors. As those are rather big (and beeing for now the limiting element for my PCB size), I would like to stop using over-rated one and take some with "just" the power rating needed.
So I was wondering what exactly the powerrati... |
H: The sign on each voltage is the polarity of the terminal encountered first as we travel around the loop?
I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 2.4 Kirchhoff's Laws says the following:
Kirchhoff's voltage law (KVL) states... |
H: How does this offset and gain amplifier work
The circuit below is meant to scale and offset Vin to Vout:
In the actual application Vin is a battery voltage (4 to 5.5V ish) and Vref is a fixed regulated voltage derived from it (3.3V). The op-amp is supplied from the same voltage as Vref, and Vout goes to the input... |
H: 7 segment display input inverted
I was going through the tutorial in https://www.101computing.net/bbc-microbit-counter-using-a-7-segment-display/ using a 7-segment display I got from an electronics shop about 10 years ago. Everything works except that the signals are inverted.
When I output 0, LEDs switch on and w... |
H: How does this oscillator work in radio transmitter?
I have a hard time understanding how the oscillator works in this circuit. The oscillator uses varicap diodes V1 to change the frequency of oscillation.
But this circuit is very different from a standard Colpitts oscillator which uses two capacitors and an induct... |
H: Artificial grounds to remove static electricity on a metal frame?
I am a vex robotics student. Our team has an issue where ports on our robot core stop working due to static electricity buildup on the metal frame around the motors. Is it possible to make an artificial ground to suck in static electricity on the met... |
H: Is 3.3 v necessary for basic functionality of any SATA drives ? How to check if a drive uses it?
Am I correct in understanding that no SATA hardrive needs 3.3V for "basic" (identification/read/write) operations?
Should a drive have 3.3V specs written on its front along with 5V and 12V if it uses 3.3V? (I don't rec... |
H: Can \$\Gamma\$ remain complex while calculating return loss?
I'm working on adding .s1p touchstone export support to the xnec2c NEC2 antenna simulator for Linux. I would like the S11 dB values in the .s1p to have both real and imaginary values.
NEC2 calculates Gamma by breaking it into real-valued components \$Z_r\... |
H: Voltage terminology in plain english
The terminology I've seen to describe voltage is confusing. It's like there is no way to accurately state (in one or two words) that voltage is present. For example, in an open circuit, people often say that the entire supply voltage "appears" at the two open conductor ends. ... |
H: How Does an Adjustable Transistor Size CMOS Driver Work?
Background
The source-terminated reflected wave switching scheme is a familiar one. One just needs to add a source-series terminator, which added together with the driver's output impedance equals the line impedance.
I have, however, recently seen the followi... |
H: Why isn't my PN2222A Transistor Working as Expected?
At the moment I am trying to learn how transistors work, so I set up a simple circuit to test my knowledge using a PN2222A transistor.
3 V is from a battery pack containing two AA batteries. 6.6 V is from a somewhat depleted 9 V battery (8.3 V open circuit) that... |
H: Designing IGBT driver: question about datasheet specs
Summary
I'm trying to design a driver for a high voltage, IGBT driver, using an optocoupler for isolation, and have a question about whether this design is compatible with some of the numbers in the datasheet, and whether this is a viable approach.
Background
Fo... |
H: Way of calculating Gain of Yagi-uda antenna at a particular location
Suppose that I have a 9-element Yagi-uda Antenna. My goal is to calculate the gain function of the antenna as function of zenith and azimuth angles, i.e. \$G\left(\theta, \psi\right)\$. As far as I read there is no close formula that I can use.
S... |
H: Are the following boolean expressions correct according to De Morgan's laws?
Are the below boolean expressions correct according to De Morgan's laws?
I am trying to realise a three input NOR gate using a four input NOR gate, but I suspect I did a wrong transform.
\$\:\:\:y=\overline{a+b+c+d}=\overline{a+b+c}\:*\:\... |
H: Identify zeroes of circuit by inspection
In a circuit, we can approximate the poles of the transfer function by calculating the AC Resistance and Capacitance at every node. For every node we get a pole so a change of slope in the Bode plot by -20db/dec. Is there a similar way of approximating the zeroes of the tran... |
H: What's the function of a feedback coil?
I have seen many different high voltage circuits that require high voltage. A few of these circuits use transformers, however I only ever notice a primary and secondary coil. When taking apart a transformer or seeing one online, I almost always see a feedback coil, and I have... |
H: Why do car blinkers seem to synchronize and then diverse from each other?
When I am on the road, the blinkers of other cars seem to sync together for a few clicks and then they diverse again.
Is this just me seeing it wrong - so on fact they never sync - or is there some reason behind it's timing?
AI: Figure 1. Bea... |
H: Choose the cutoff frequency from the sampling rate
I want to use a low pass filter for the input of my ADC, and I would like to choose the most appropriate cut-off frequency based on the sampling rate of the ADC, which is 40 SPS. Is there a simple mathematical relationship or practical rule to evaluate the most app... |
H: Managing high power battery pack voltages
I have a few upcoming projects that will require some higher power battery applications where voltage swing needs to be limited. Both will be powering electric motors.
The first on will be ~1.3-1.5 kW, 24 V motor (7s21700 battery). The second will be a 10 kW, 72 V (20s21700... |
H: MPU6050 losing orientation
I've been playing around with an MPU6050 (GY-521 board) with a Nucleo L476RG.
I think I'm reading the gyroscope correctly, but it seems like the values are only changing when the sensor is moving, and when it stops, the orientation goes back to 0, 0, 0.
Is this normal? I though the sensor... |
H: Deriving headroom for the 34063
I've hit a design dead-end because, after running the numbers for an SP34063A-driven SMPS, it seems it doesn't have enough headroom. This was not described directly in either the OnSemi or TI application notes I worked through, but instead a consequence of timing constraints.
I had i... |
H: Correct way to attach a power cable to this kind of female plug?
I am trying to figure out how to connect AWG16 power cables to the plug shown in the picture. The plug will be a power source (220V 10A) in a plastic enclosure.
Can I just insert the cables into the plug's "rings", twist them and isolate them with an ... |
H: Analog mux with active low enable.I/P and O/P state when enable is High
I am using this mux (74LV4051D,118)from Nxperia for one of my applications.The functional table is given below.
When the Enable is High S0, S1, S2 are don't care, and the switch is off.
May I know when Enable is high,can I assume both I/P (S0-S... |
H: How to interpret internal_ram data section in NXP
In .lcf (linker configuration file) in my project, in SRAM memory there is an internal_ram section:
And in my case this internal_ram section is overlapping .bss, heap, and stack sections after compilation.
Because of that, I wonder what is being stored there if sta... |
H: Operating region for transistor in capacitance multiplier
I want to understand what is the desired operating region for a transistor in a capacitance multiplier circuit being used to remove power supply ripple.
Consider the circuit in the attached image. From what I understand, depending on R1 and R2, for a given s... |
H: Why do we need to connect the load before NPN transistor
I am trying to use transistor as switch and getting confused with the workings.
For a NPN transistor, Collector needs to be connected to +ve and emmiter to -ve.
If we look at the schematics below, in both the diargrams, I am connecting the collector to + and ... |
H: Can a system get immediately to the sinusoidal steady state?
Suppose we have a theoretical LTI causal system with zero initial conditions and we apply a sinusoidal input at t=0. If the system is initially at rest, will the output be equal to H(ω)cos(ωt+Arg(H(w))) for every t>0 or t has to tend to infinity to get th... |
H: Does the effective reluctance of an air gap between two windings increase from circulating air?
If I have an inductor next to another copper coil (I don't exactly know the lingo for a coil receiving power from an inductor), and there is a significant but not large air gap between the two coils, will the reluctance ... |
H: Accuracy of analog multimeters
What accuracy should I expect from an analog multimeter that cost 50$ when measuring resistance?
It's measuring 1.5 kilohm correctly, when measuring a 10 ohm resistor it's about 30% off. I tested it against my digital multimeter. Return it as "broken" or is this what I should expect i... |
H: Why must VOH > VIH and VOL < VIL for a combinational device?
I understand why VOH > VIH and VOL < VIL for a sender/receiver relationship between component A and B. In order for the receiver (component B) to be compatible with the sender (Component A), if VOH of B < VIH of A, then an input voltage between VOH and VI... |
H: LM358P doesnt respond to inputs
I am currently building a Li-ion cell capacity tester. The circuit has two parts, one that charges the cell, and one that discharges it, but I have removed the charging components to make the circuit easier to read (I can add them if needed).
simulate this circuit – Schematic create... |
H: Mathematical function a of an integrator in series with a non inverting op amp
I am trying to understand the circuit given below so I can make a mathematical model of it.
The circuit consists of an integrator with a reference (offset) voltage and a non inverting op amp connected in series. All of the parameters ar... |
H: Chip antenna and uFL/SMA connector routing
I created a PCB on which, depending on the mounting variant, I would like to place a Johanson Technology 0868AT43A0020E antenna or a uFL / SMA connector for an external antenna. I have a few questions:
Should I put any element before the matching circuit (C3, L2, C4)?
Sho... |
H: How would I connect my noise source to a circuit in LTSpice?
I have a very basic question about connecting voltage sources to circuits in LTSpice.
I started with the macromodel test fixture for the OP27.
I really like the way the positive and negative rails are defined in the macromodel test fixture. I would like... |
H: Is there a way to keep internal 1.1V of atmega328p always on?
I have an application with Arduino, where some of the analog pins need AVCC as their reference voltage, while another one needs the internal 1.1V as the reference voltage to obtain a measurement with better precision than comparing against 5V.
I just fou... |
H: Stepper motor ABCD versus A+A-B+B-
I am replacing a stepper motor and am checking that the wiring is the same as my old motor. All of the wires are colored the same: black, green, red, blue. But my old motor uses the convention black A+, green A-, red B+, blue B- and includes this diagram.
My new motor includes... |
H: Change Notification Interrupts PIC32
I am attempting to code a program for a PIC32 where pressing the S1 button lights up the LED, and releasing it turns it off, LED2 is also blinking - using interrupts.
The pressing and releasing works, but after pressing the button, LED2 stops blinking and stays on its state. Bel... |
H: Switching voltage regulator - exceeding output voltage limits
I have been designing a digitally adjustable step-down voltage regulator. Mainly because of the availability and price I chose:
MCP1612-ADJI/MS
I followed the datasheet and created the following schematic:
My plan is to use a DAC integrated in the MCU... |
H: Routing traces to and from a 48 pin microcontroller becoming a mess
I have a 48 pin microcontroller with VCC = 5V. I'm becoming worried that I have the traces too close and all the vias and crossing traces may mess with the signals' integrity.
Are there examples and general guidelines to routing traces in such a si... |
H: MOSFET PWM issue
I want to dim an LED and have connected a P-channel MOSFET to switch the high side. I added a N-channel MOSFET as a driver. The schematic is attached below.
I'm applying a PWM sine signal from an STM32.
Problem:
If I measure the voltage on the drain of the N-channel SI2302 to ground, I see that the... |
H: Can a diode bridge be connected to a high input voltage?
I'm trying to rectify an AC current at 220V. Many written tutorials don't mention any transformer before the diode bridge and many video tutorials use transformers that provide an output of 6V or more.
In my understanding, diodes can withstand only very small... |
H: SMD, reflow or hot-air gun?
What are the advantages and disadvantages of using a reflow oven vs a hot air station for prototyping SMD PCB? Do you need an oven or would an air station work?
AI: The advantage of a reflow oven is that it evenly heats everything in a controlled and automated way. Assuming the oven is ... |
H: UTD 2052 oscilloscope: read data from .sav file
I just recently got an oscilloscope and was happy to try it out. Now I have a problem with reading the data. The model I am using is the UTD2052 50 Mhz scope.
I can save the data to a USB drive in the format .SAV (file is in drive link). Now I can't seem to find any s... |
H: Why do you need resistors for components, like ADS1115?
I am trying to design my first own PCB and before I always have used breadboards or Prototyping boards. On them you use smaller PCBs, that come with the components on it, to connect it to you circuit.
When you design your own PCB you integrate the smaller PCB ... |
H: What happens to the permanent magnet flux of this synchronous motor?
Considering a synchronous motor with permanent magnets (1 pair)
If there is a synchronous motor with permanent magnets and I was given the initial permanent magnet flux
Y_mp = e0(at 15 rps) / w (at 15 rps) = 168.3 V / 94.2 rad/s = 1.79 Wb
Y_mp = 1... |
H: 5G and aircraft?
I just read the statement of a company,
"We are frustrated by the FAA’s inability to do what nearly 40
countries have done, which is to safely deploy 5G technology without
disrupting aviation services, and we urge it do so in a timely
manner"
But I don't see any reason to make a rush changing to ... |
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