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H: Why is the soldering surface of this pogo pin slightly rounded?
I was curious as to why the bottom of these SMT pogo pins are slightly rounded. Wouldn't it cause them to fall over before they are reflowed ? It seems that a completly flat bottom would make sense like most SMD pads.
AI: The curved bottom will allow f... |
H: disagreement between theoretical calculation and measurement of upper cutoff frequency of a circuit based on RG58 coaxial cable
For a 100 meters RG58 coaxial cable, according to the datasheet, the capacitance of the cable is 10 nF and the inductance is of 25 µH approximately. A sinusoidal voltage is applied at the ... |
H: 1A load with 3 1,5V@2950mAh AA Alcaline batteries
I have a system that is powered with 3 AA Alcaline batteries Varta Industrial Pro (1,5V@2950mAh).
The batteries are connected to a this 3V3 LDO that supplies power to a MCU. I have taken a minimum dropout of 150mV (so LDO would work down to 3V45).
The MCU system wil... |
H: Current source schematics. What's the difference?
I have two current source schematics. They are nearly identical and one could be transformed to another by moving componets and voltage sources around. Both are set to 1 mA output.
But the left one doesn't work. The right one works perfectly. Why?
AI: This is real... |
H: What is this white box in a battery pack?
I have an O2 Hurricane canless air system that seems not to charge anymore. I was a bit surprised because it hasn't been through much use or many charging cycles, and customer support was non-responsive, so I decided to take it apart and see if I could at least make it work... |
H: Troubleshooting Switch Mode Power Supply
I am trying to troubleshoot switch mode power supply from HP workstation. I have done visual inspection and didnt find any anomalies on the capacitors. I reckon that the culprit might be the fuse as there is absolutely no light nor fan movement when the power supply is conne... |
H: Understanding voltage drop
Meanwhile in quarantine I been trying to learn about electronics. I am still not able to understand the voltage drop when it comes to long wires. My goal is to be able to send a 5v signal over a very long wire. I have read a lot about Ohm's law, done a lot of exercises and I am still conf... |
H: What micro-controllers are suitable for a closed-loop DC Motor?
I am working on a small experiment on a closed loop DC motor for speed control.
The DC motor is separately excited and fed through a DC chopper.
I would like to know what are the best micro-controllers best suitable for this project?
AI: Assuming a bru... |
H: Hall sensor confusion with unipolar and bipolar as well as magnetic induction sensitivity
I want to create a simple bicycle computer that shows my speed and RPM.
I'm thinking of using a TLE4905L or TLE4906L (which I think is more sensitive) - both unipolar.
Now I'm a bit confused about unipolar vs bipolar.
When my ... |
H: Understanding TVS diodes in this application
From this Reference Design you can see they use two TVS diodes at the gate of the first FET to clamp voltages greater than 500V. They do the same in this other Reference Design.
So basically my question is: TVS diodes do not regulate compared to Zeners, so can this appro... |
H: Can you turn on a light bulb using only one of the two wires of the wall outlet?
Instead of trying crazy things I would rather ask. I am asking this for purposes of learning.
So I have learned that if the voltage is high you can get electrocuted by touching only one side of the wall outlet. That is because the pote... |
H: Am I using the right resistors with these MOSFETs for an ESP8266 controlled LED strip?
this is my first question here. I hope I don't mess it up.
I made a WiFi controlled LED strip about a year ago. The LED strip is one of the "dumb" (no individual pixel control) 12V ones and I used a Wemos Mini to control it. Now,... |
H: How much power can a 7805 voltage regulator dissipate without a heatsink?
I am using a LM7805 linear voltage regulator.
Vin is 12 V
Vout is 5 V (regulated)
My load is currently 100 mA. Without a heatsink, it's pretty hot.
Could i use a large heatsink to regulate 5 A?
Or what is the maximum output current with a he... |
H: Parallel Resonance circuit Q factor formula Clarification
I'm confused with the formula of Q factor in parallel resonance because in other books its different
is it okay to be like this ?
A. This is from the Electronics Tutorial Website
A. This is from a book
AI: I'm confused with the formula of Q factor in paral... |
H: STM32F030P6 MCU returning high even when no voltage is measured on the pin
I am trying to make a custom PCB based on stm32f030p6 MCU. one of the requirements is to read a pin's value (digitally i.e. high or low).
for this purpose I am using stm32CubeIDE, and to read the pin's value, its first initialised as below:
... |
H: Where to connect GND on keyboard multiplexer circuit?
Hi all,
I'm making a project to read my old calculator's keyboard with an arduino and I've decided to design a new PCB and change it with the original one, as it's easier than trying to hook into the old circuit.
I'm working in EasyEDA and it's nearly done, but... |
H: Power recirculation rig using rectifiers and BLDC motors
I am currently trying to set up a rig to test my 3d printed gears under different torques and motor speeds. The power input side is going to be the BLDC motor, driven by a hobby ESC (BLHeli_32), powered by a generic AC to 12V PSU. On the braking side of the g... |
H: What is the thermistor sensitivity?
Here it is written:
Some references use the negative temperature coefficient (NTC) a to describe the sensitivity of a thermistor alpha = -B/T².
and here it is
The B constant expresses a degree of thermistor sensitivity (change rate of its resistance) to temperature changes.
... |
H: How to wire a two pin bridge rectifier
I have this bridge rectifier (Image below). https://www.deantechnology.com/products/hvhp10k
How do I wire this? I know how to wire four pin bridge rectifiers but how do I wire this two pin rectifier?
AI: A rectifier doesn't necessarily have to be of the bridge type. In fact, "... |
H: How can I design the BJT based inverter question given in description?
QUES: Design a BJT based inverter operated from a 1.5 V supply.With the input connected to the 1.5 V supply through a resistance equal to RC, the total power dissipation should be 1 mW and forced β should be 10. Use VBE = 0.7 V and VCEsat = 0.2... |
H: Why use bigger resistors for LED?
I have a diode where forward voltage is 3.5V and forward current is 25 mA. I supply it with 5V so I calculate a value of resistor in the following way:
R = (5V - 3.5V)/25mA = 60 Ohm
However I see that most times bigger resistors are used, like 220 Ohm or 330 Ohm. Why is it better t... |
H: Design R C snubber for flyback converter
I have a DC/DC flyback converter and I need to design a snubber.
I already know the diode to use I just need to design the R and C value. Now, I have simulated my circuit and tweaking values on C and R I came out with C=680uF and R=2.2kOhm; the problem is they are simulated ... |
H: Does a Mcp23s17 output pin keep the value after being unselected?
I'm designing a SPI based communiations circuit between Raspberry Pi4+B as a master and (n x 8) GPIO expander modules, as slaves. Concretely we have selected an MCP23S17 GPIO expander: Datasheet
By the moment I will try if the system is able to write... |
H: An equivalent resistance with a short
simulate this circuit – Schematic created using CircuitLab
This schematic is giving me trouble because of the connecting wire shown in red. What is the equivalent resistance of the circuit, as seen from the blue terminals?
AI: As it is clear that R1 is short circuited by that ... |
H: Second order all-pass filter input impedance
I have a question about the second order all-pass filter input impedance when ω = ∞ and ω = 0 and I would appreciate if you could help me to understand the logic.
When ω = 0, all capacitors can be seen as open circuit, because we are at DC level. In this case I expect t... |
H: Is a 2N3906 an appropriate replacement for a BC158(B) in audio amp circuit?
On a long but educational process repairing a vintage German stereo. I have identified a failed (shorted) PNP transistor in the power amp section. (Schematic with highlight is below.) The part on the actual board is a BC158B; the schematic ... |
H: Hardware-Software synchonization with clock in a microcontroller
From what I understand, there is a clock in a micro-controller, and every little task is executed at a clock pulse.
Can two or more actions be performed simultaneously (In the same clock pulse)?
For example, assume two lines of code. In line 1 I send ... |
H: Design of class AB output stage
I'm trying to design an audio amplifier output stage to drive a speaker load. I'd like to start with the design of this stage in order to calculate the input impedance to the output stage so that I can proceed to designing a buffer stage with an appropriate output impedance and a gai... |
H: Why don't I need a resistance when testing a light bulb circuit in a breadboard?
I'm making some simulations in Tinkercad and trying different circuits to turn on a light bulb.
Why does an LED need some resistance and a lightbulb does not?
I'm only using a breadboard and a 9V battery.
AI: With LED's, a small increa... |
H: Replace everything in the circuit except the 3 A source by its Thevenin equivalent circuit and use the result to find V1
Replace everything in the circuit except the 3 A source by its
Thevenin equivalent circuit and use the result to find V1.
This is my solution but the teacher said it is wrong and i do not know h... |
H: How are the neat sinc function shaped carriers produced in OFDM?
I am learning about OFDM and QAM.
Every explanation I have read illustrates how the separate carriers are sinc functions that are arranged to overlap in a nice orthogonal way so as to cancel out interference from neighbouring carriers.
The part I do... |
H: I don't understand the outcome of the solution for a circuit with two voltage sources and an inductor
I have solved this circuit problem and I don't really understand the result in terms of power for the two sources.
So for source one, it is clearly generating real and reactive power.
For source two, it is consumi... |
H: Why Wouldn't I Buy A Diode With The Highest Reverse Voltage?
I'm only just beginning to read about diodes. I'm looking at the 1N400x series, where all specs are the same except the reverse voltage (link: https://www.mouser.com/ProductDetail/Diodes-Incorporated/1N4003-T?qs=rGAXPo9uwV0nfQ36LZW%252BLg%3D%3D for exampl... |
H: Assortment of electrical component for beginner
As a newbie in electronics when building projects with Arduino, sensors etc. on PCB I often have a problem with electrical components like capacitor, resistor, diodes, switches etc. For different projects one needs different electrical components with different size. ... |
H: AC coupling of a transistor
So we assume to have proper bias currents flowing in both of the two transistors. What is claimed by books is that a capacitive coupling will not change the bias parameters.
But, we know that a capacitor will charge and hence gain voltage across it. Now this capacitor voltage is applied... |
H: Electrical Motors and Frequency
I was musing about electric motors after seeing one randomly on TV, and there's something I'm must be remembering incorrectly.
It's just a thought experiment, so I'm imagining some theoretical DC electric motor, with a constant RMS current/voltage feeding in, and some constant load o... |
H: How to use MOSFET as an active load resistor?
In the Albert Malvino's "Electronic Principle" book, an active load switch is done by using a MOSFET as an active resistor by connecting the gate to drain(two-terminal device)(figure a)
Two terminal MOSFET act as a pretty big resistor (15V/3mA=5kohm, 10V/1.6mA=6.25kohm... |
H: Isolation Capacitance (Cio)
How I can find a practical value of CIO barrier capacitance (primary to secondary side) in digital isolators?
AI: Actually i want to measure it in a practical way to verify the value
in the datasheet. How and which equipment i should use to measure the
isolation capacitance of digita... |
H: Are there any functional differences between xc16 and C30?
I've recently istalled MPLAB X (free version) and tried to build an existing project which uses C30. C30 seems to have been replaced with xc16 which does indeed build the project but the resulting .hex file cannot be flashed onto a dspic30f6013a.
Where can ... |
H: Power In= Power Out in transformers
In transformers, we prove that the induced voltage per turn is the same in both primary and the secondary coils of the transformers, i:e (Ep/Np)=(Es/Ns). But when it comes to currents, we show that (Ip/Np= - Is/Ns), which should yeld to (Ep x Ip= - Es x Is). This equation should ... |
H: Is it possible to replace the ref pin of AD620A with a fixed voltage?
I am trying to implement the below circuit (from) without ADuC842, I will use Arduino mega2560 ADC.
the circuit generates -5V to 5V rail to rail voltages for ad620a
and they control ref voltage via DAC to adjust offset dynamically.
from the link... |
H: Can FPGAs be emulated on a CPU?
Can FPGAs be emulated on general purpose computers? As per Church-Turing thesis all Turing machines can be emulated on the universal Turing machine. So if the FPGA can emulate processors, can the processors emulate FPGAs?
I am asking this question so I could know if instead of using ... |
H: How can thermal electrical noise be uncorrelated yet appearing at a certain frequency?
Say we look at the thermal noise spectrum of an ideal resistor. Now we know it will behave like $$ \langle U^2 \rangle = 4 \, k_B \, T \,R \,\Delta f $$
We also know that two subsequent voltages are uncorrelated:
$$
\langle U(t... |
H: The choice of method for constructing hardware monitoring and diagnostics
created a weight scale device.
I chose the software method for diagnosing my system. How can I implement it?
X1 is a load cell 5000 grams
DA2 HX711
D1 Atmeaga328
D2 shift register
H1 lcd display
What is the best way to test these items befo... |
H: New soldering iron turns black as soon as it reaches 350C
I can't even tin it as it turns black befor I reach melting temperature. I tried 6 different tips and result is the same - it turns black and solder doesn't stick, I've no Idea what to do at this point also it smokes when reaches about 350C.
Is it just broke... |
H: Can I "sum" internal ADC channels to achieve extra bits resolution?
First of all I am a newbie in electronics.
I am building some weight scale applications using (as seen everywhere) load cells wired to a HX711 ADC and a ESP8266. I am now giving a try to the Texas Instruments CC1312R MCU (datasheet), still work in ... |
H: What is the maximum voltage that the circuit can withstand
Below is my circuit,
ESD Capacitors Specifications :
C0001, C0002, C0003, C0004 = 47nF, 100V, 10%, 0805
I have 2 basic questions :
When a +4kV pulse & 330pF is applied, Does the 12.77V (Q=CV ; Q =4kV * 150pF = 600nC. Voltage at the top node = 600nC / 47n... |
H: Current division with a short
simulate this circuit – Schematic created using CircuitLab
This schematic is a bit difficult for me to understand due to the short (red). What is I3, the current over R3 (indicated with open terminals, in blue)?
AI: Your answer is correct but, in a comment, you write that you're unsur... |
H: Bjt connected as diode
I have a dumb question. My textbook says \$\beta I_B\$ current flows into the collector terminal.
Isn't Collector-Base path shorted by the external wire? Since base and collector regions are semiconductors, they offer very high resistance compared to the external wire path. How can more curre... |
H: Do metals with different electrical conductivities have different succeptibilities to induction?
If you have an inductive levitation coil and you gradually increase the strength of the AC current to the coils, could you fraction off metal powders by levitating each of them separately due to their differing electric... |
H: how to tune wave to obtain a specific harmonic seriers
I wanted to know what is the relationship between a square wave and its harmonics, in other words can i change a square wave features (frequency, duty cycle etc) to obtained a desired fundamental frequency (and its corresponding harmonics)?
Any help would be ap... |
H: Operation of Induction Motors and their Back EMF
I'm trying to reconcile the physical steps that go into the operation of an AC induction motor. Looking online, I either find broad and general explanations that I already know and understand, or very specific and math heavy explanations that get a bit overly detaile... |
H: How to wire AC motor for old fan?
I have a AC motor and it's belong to an old desk fan, unfortunately I missed it's circuit diagram, so it would be great if you could help.
My AC outlet supplies 220V, and the motor comes with a 1.5uF capacitor.
As you can see in this photo, I have 6 wire
Gray and Red are together!... |
H: H Bridge not working on HV
I'm trying to make a 300V H Bridge for an electrostimulator. The circuitry is as posted here, using MOSFET P20NM60GP:
When I tested it with low voltage supply (just for the sake of safe testing), and a 15 Watts 1kOhm resistor I get the output waveform I desire, that is:
However, when I... |
H: Voltage source placement
simulate this circuit – Schematic created using CircuitLab
simulate this circuit
I would like to better understand the meaning of voltage source placement. To me, these two subcircuits seem the same, but I am not sure. Are they the same?
AI: Figure 1 and 2. OP's original circuits.
Technic... |
H: How to combine two resistors with a voltage source
simulate this circuit – Schematic created using CircuitLab
simulate this circuit
Are these two circuits the same? If not, could you please indicate why as well?
AI: When starting out, your brain is easily tricked by the arrangement in which things are drawn rathe... |
H: Precautionary Discharging Capacitor went Terribly Wrong | SMPS
I wanted to check the fuse of SMPS pictured.
In order to safely conduct the procedure I followed the discharging procedure as provided in many tutorial videos i.e (connecting the end of the capacitor using nose plier). The fuse seemed alright but I wh... |
H: Value of resistor and the current in branch with the capacitor
I am trying to learn electronics basics. I have a question asking for the current in the capacitor branch and the value of the resistor that is before the ground
I have used a circuit simulation software to find out that the value of the resistor is 4... |
H: Minimum output current of DC-DC
This question is a result of several bad decisions compounded by rush implementation. It is similar to this question, unfortunately the answers there provide only explanation, not the solution.
I had to add isolation to the UART port on already assembled boards. Luckily, the boards h... |
H: Substituting a capacitor of different capacitance
If a circuit calls for a capacitor with a specific capacitance, what happens if a capacitor with a different capacitance is substituted?
I have a circuit that calls for a 250uF capacitor to power a small speaker. What would happen if I substituted it for a capacitor... |
H: How to find out which process triggered join_any in verilog
I have three tasks running in parallel and the fork joins when one of them gets completed. I would like to know which one was completed first and caused the fork to join. Is there a way to know it?
fork
task1();
task2();
task3();
join_any;
AI: A g... |
H: Centroid from calculated root locus is different to the one from MATLAB
Hi all hope someone can help me here.
My problem involves the transfer function
G(s)=(s+32.8)/((s+2.8)(s+5)(s+27.8) )
As far as im concerned the centroid is calculated using
σ_a= (Ʃpoles - Ʃzeros) / (# of poles - # of zeros)
From my calculat... |
H: Software identification of a DIY (guitarist) CAD application
I know there is a reasonably popular tag for component identification, however I have a question about software identification.
Before I used KiCad (when started with electronics), I used for a while a very simplistic 'CAD' program for perfboard layouts. ... |
H: Compatibility of devices with different voltage thresholds/noise margins/static disciplines
tl;dr included at the bottom.
Suppose we have two logical buffers from different logic families, where buffer A drives buffer B. Buffer A has the following voltage thresholds: \$V_{OH}=8\ V\$, \$V_{IH}=6\ V\$, \$V_{IL}=4\ V... |
H: Displays used in clocks - use with Arduino/ESP32/PIC
I'm working on a project with a micrcontroller and I need a low-power display similar to something shown above. Does anyone know what these particular displays are called and whether or not there exists ESP32/Arduino compatible versions of these?
I thought of e-... |
H: Switching 240V A/C source between two loads with relays
I need to swich a single US 240V (hot-hot-ground) power source between two A/C motors, 20 amps max, with an option of disconnecting both. For this project, design aesthetics is very important and I want to use a 3-position selector switch with 90 degree index.... |
H: How critical is winding a solenoid/electromagnet neatly?
We've all seen the expensive toroidal winding machines on YouTube, and manufactured solenoids are always so neat in construction - as in: Each winding is neatly packed to its previous, without overlapping itself: like "-/////////-"
There's no explicit numeric... |
H: RFID Logger & Battery
I'm a complete novice when it comes to circuitry & electrical engineering. I'm more of a coder. So I really appreciate your input, even if my questions are simple for some.
That being said, I need to power an RFIDLOG & auxillary logger from Priority 1 (http://www.priority1design.com.au/rfidlo... |
H: Opamp driving 24V signal through long wire
I have an opamp working as comparator that creates a 24V pulse signal (appx. 400ms duration) that needs to go through a wire of 10-20m length. Is a normal opamp capable of driving this or is there a certain common circuit to achieve this?
AI: Most op-amps will effectively ... |
H: Help identifying an encryption accelerator
I believe this was released around 2010. Pin configuration appears to be 8x8
I was able to get it hooked up. Hardware ID:
PCI\VEN_104A&DEV_7007&SUBSYS_00000000&REV_21
Vendor 104A is indeed STMicroelectronics. Thank you!
AI: Help identifying an encryption accelerator... |
H: Mosfet load control - different design compared
i've seen in a forum this design (Circuit 1) to drive a load using mosfet, i'm wondering in which differs from the "well-known" MCU mosfet driven loads like the second one in the image below (Circuit 2)?
What are advantages/drawbacks on using the first design over t... |
H: What will be the effect of adding a 10k load resistor to this circuit?
Background
When ignoring the 10k Resistor:
When Vsupply = 28V, I have worked out that the current through ZD1 = 4.95mA.
When Vsupply = 14V, I have worked out that the current through ZD1 = 4.9mA.
Question
When the 10k resistor is includ... |
H: The potential drop in a pn junction diode
In the picture shown above, I was trying to learn about diode equivalent circuits. I am not being able to understand the direction of Vb taught by the instructor here. The question is-
If the n region has more potential than the p-region, shouldn't the direction of the bat... |
H: Difference between always @ block and @ statement in Verilog
I have not across the statement @(posedge clk) before. I would like to know how this statement is different from the always @(posedge clk) block which I am familiar with.
If I use a sensitivity list in a task for a Finite State Machine synthesis without a... |
H: How to determine regulator's components values?
The final goal is to have an output (u0) of 22 V. The only information given is the uBE value of 0.7 V and the maximum load current of 1 A.
I'm having a hard time determining basically every value involved in this circuit. It would be nice if someone could at least t... |
H: Systemverilog size attributes
Suppose we have a 2d Systemverilog array declared as:
logic x [0:3][7:0] ;
How can we use an attribute to get the width of the first dimension ?
How can we use an attribute to get the width of the second dimension ?
Is there an attribute equivalent to VHDL's "range" attribute ? I.E: ... |
H: Why do x amp rated consumer electronics often come with >> x A rated BS1363 fused plugs?
I often find that consumer electronics from reputable brands come with fused plugs that are rated significantly higher than the actual product.
I would have thought that the ideal fuse would be \$x+\epsilon\$ where \$x\$ is the... |
H: Obtaining 4-4.2V rail from 5V output of LM7805 voltage regulator
I'm creating a numitron clock with 4xIV-9 tubes (seven-segment filament displays) and have decided to illuminate them using shift registers controlled by an arduino. Each segment takes a voltage of 4-4.2V and around 17-20mA of current.
My voltage I ha... |
H: TIVA TM4C123G check clock frequency with oscilloscope
I'm trying to configure system clock in the TIVA TM4C123g board. I'm aware that this clock signal goes to a pin called OSC0 which, according to this, is the pin number 41 (see page 22). According to the same document, that pin is supposed to be in the PCB's U1 m... |
H: How does this old fan regulator circuit work?
I was on the lookout for an old fan regulator. I had heard that its power consumption was constant at all speeds.
I could lay my hands on this 1970 regulator. It appears to be a transformer with rotary switch tap selection.
I am curious to know about its function espec... |
H: Purpose of 1000uF capacitor in input
The board connected to power supply with 50-100m cable. There is C1, 1000uF 50V capacitor on input of board, next to power connector. Schematic of power circuit is below. I think it is for bypass or decoupling. It is really big in physically, so i think the purpose of it and an... |
H: What causes my computer fan to stop briefly before resuming spinning?
I'm building a small fume extractor for soldering.
I have a leftover desktop fan I'll use. I was unsure about the voltage needed, so I hooked it up to my power supply and stepped up the voltage until it started spinning (around 6V but I think mos... |
H: Sensor data transmission without using a microcontroller?
What is the most traditional approach to getting sensor data onto a radio from an embedded device pcb that doesn’t utilize a microcontroller?
Up until now, we’ve been utilizing a convenient firmware on the radio that accesses discrete GPIO data directly wir... |
H: Thevenin voltage (Voc) with a resistor in the way?
simulate this circuit – Schematic created using CircuitLab
I'm still having trouble with how Thevenin voltages are obtained. Above is an example with designated terminals (red). What if there is a resistor in the way (R3)? Is Voc only R2/(R1+R2)? How can R3 not ma... |
H: 555 timer as a voltage controlled oscillator, duty cycle query
I`m trying to create a square wave generator using a 555 timer but i noticed that due to the pulse width modulation as i vary the control voltage, the duty cycle changes so i was wondering if there is a way to ensure the duty cycle stays to 50% regardel... |
H: Degradation in performance of pump
I recently purchased a Dc pump rated 3 to 6v~ On connectig it with a 9v battery(cheap one) it works well for 5~~minutes continuous after which its performance degrades to a level of it where it's useless I don't understand is there a fault with my 9v battery or the pump,, I did ch... |
H: Transfer function of a second order capacitive accelerometer
In order to find the transfer function of the accelerometer MMA7361L based on the information given in the data sheet 1 I first made a hypothesis that it a second order sensor since it has a resonance frequency
the frequency response would look like thi... |
H: Do PMOS Reverse Input protect on ORed power rail
As the title says, I have a power mux IC and two power inputs. I need them to be protected from reverse voltage input. The power mux I have already comes with a reverse voltage input protection but I need the second input voltage for another IC and its not always the... |
H: Using a DS3231 RTC alarm + MOSFETS to turn on a MCU
I'm using a DS3231 in conjunction with two IRLZ44N MOSFETs to switch power to a MCU when the alarm on the DS3231 triggers. The alarm on the DS3231 pulls the SQW/INT pin to ground and turns on the MCU using the IRLZ44N FETs. When the MCU resets the alarm on the DS3... |
H: Can I replace a 32 A switch with a 32 A MCB?
A switch for a water heater in my apartment is broken (image attached).
It is an "Anchor Roma 32 Amp 1-Way Switch with indicator".
Can I replace it with this or this switch?
Would the installation be similar or the same?
Background:
I am a software engineer; I am not an ... |
H: Oscillator made from an RC network
I would like to understand how the oscillator of this PWM controller works, and what would happen if I do not apply an RC network but directly a PWM signal generated from a microcontroller for example.
It is indicated into the datasheet (https://www.ti.com/lit/ds/symlink/uc3845.... |
H: What is the purpose of this schottky diode reversed across the BJT base resistor?
In a design for the popular "gotek" floppy drive emulator, as per the standard, the outputs from the floppy emulator are open-collector.
An STM32 is used as the processor. This drives a 74HC04, which then drives MMBT2222A NPN transist... |
H: How independent is the output voltage from the load resistor in this linear regulator?
Consider the circuit below:
So we know that the op-amp will try to keep \$V_{+}\$ equal to \$V_{-}\$ (Inverting and non-inverting voltages of the op-amp) . Knowing this we can calculate the output voltage:
$$ V_{+}=15\times \fr... |
H: Superposition of energy
simulate this circuit – Schematic created using CircuitLab
My current understand is, for superposition (V1 and V2 acting alone) to be used in the circuit above to calculate the energy dissipated over a given resistor, the following must apply:
$$\int_{T_1}^{T_2} v_1\cdot v_2 \cdot dt \equiv... |
H: Error while implemeting D_FF from JK_FF in Verilog
I'm designing a D_FF from JK_FF.
The circuit I'm implementing is , as shown in the figure :-
Verilog Module Code :-
`timescale 1ns / 1ps
/* Conversion of a JK Flip Flop to a D Flip Flop
Connections are "J = D" and "K = ~D"
*/
module d_ff_from_jk_ff (q,q... |
H: How do i go about finding the transfer function of this system with two inputs?
This was how i tried to formulate the answer but ive been told its incorrect.
$$R(t)=u(t)$$
$$D(t)=u(t)=1/s$$
$$K=10$$
$$H=1$$
$$G=\frac{K}{s(s+1)(s+2)}
=\frac{K}{s^3+3s^2+2s}
$$
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