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H: Changing gate turn off voltage of SiC MOSFET from 0V to -4V
The design of sic gate driver circuit is designed to work at 0 V as gate turn off voltage. Due to some undamped ringing at turn off, I want to change the gate turn off voltage at -2 or -4V which is generally recommended by all manufacturers to avoid false... |
H: H11L1M optocoupler is inverting
I'd like to protect a serial connection with a H11L1M (I can easily get some at work and it works from 3 to 16 V).
The problem is this optocoupler is inverting and has the following truth table:
Input
Output
H
L
L
H
Is it possible to drive the LED from the anode? I mean... |
H: Design Suggestions for an Optocoupler Relay Module
I have designed this module to operate with input voltages of 5V and 3.3V (common in most MCUs). Additionally, I have equipped it with an optocoupler to isolate the MCU from the power section of the circuit.
I wanted to know if you have any design or optimization ... |
H: Reading 4-20 mA industrial pressure sensor
I am trying to read an industrial pressure sensor (datasheet) with range 0-10 bar and output 4-20 mA, with an Arduino Opta RS485, powered from an external 12 VDC source.
Leaving the sensor in the air, not connected in any process pipe (-> 1 bar) and using a 470 Ω resistor... |
H: Name of this 4-pin fan connector
I have a 40mm fan with a connector that has standard breadboard pin spacing. I would like to connect it to what I thought was a relatively standard fan connector that has wider spacing (and thicker pins).
In the image below, the fan is wired to the connector on top; I'd like to conn... |
H: Monopole antenna with coil design
(Note: I'm a beginner in antenna theory)
When browsing for low cost antennas online, there seems to be class of monopole antennas that have a coil or two built into the monopole, and are advertised to be suitable for operation in the GHz range despite being 200~300 mm in length.
Fo... |
H: How to determine voltage level of the ultrasonic transducer?
I am designing the generator for an ultrasonic transducer for a cleaning system and I am not sure how to set the output voltage level.
I measured the voltage level of the existing products, peak voltage was around 150V ~ 200V.
When I searched for informa... |
H: Op-amp - Lead compensator design
I would be very happy if anyone can help me find answer regarding to questions below:
The lead compensator is added to the system to increase the phase margin.
1'st picture is related to the uncompensated loop gain-phase graph.
2'nd picture is the summary of the lead compensator. Po... |
H: Determining current magnitude
Here is problem 3.9 from Hayt "Engineering Circuit Analysis".
I reduced it to single voltage source, keeping direction of current the same as indicated by arrow.
simulate this circuit – Schematic created using CircuitLab
Solving it gives me current of 54A, while answer is -54A.What a... |
H: Which power source is good for my project?
I want to create an inverter LED light source. I would be using 2 COB LED lights rated at 4 volt DC, 8 watt. My idea is that when the phase is connected, I want the light to glow and at the same time charge the battery. When the phase is not available I want the bulb to us... |
H: Why are smoothing capacitors useful/why do they work
Okay so from my understanding and looking at the equation for the impedance a capacitor has, the high frequency signals would be relatively easy to be sunk to ground (if the capacitor was grounded) and hence the decoupling caps near ICs. So (I think) from that pe... |
H: MOSFETs stabilizing current in coils keeps burning, how to protect them?
I am trying to stabilize the current in coils in my experiment. For that I am using a circuit as in the picture:
First section is a fast switch. It is also galvanically isolated from the TTL signal with opto-coupler (not in the picture)
Secon... |
H: Buck Converter - C_OSS charging up loss
Consider the following synchronous buck converter:
where Q1 is the high-side and Q2 the low-side
(https://fscdn.rohm.com/en/products/databook/applinote/ic/power/switching_regulator/buck_converter_efficiency_app-e.pdf)
When the high side Q1 device turns on, it will charge up... |
H: Earth for custom POE+ board design
after getting the center tap pins for poe, I have an example schematic to design an EARTH ground. I have the understanding that that would be our Earth in AC over cabinet. That would remove our value for doing this entire poe design, as we only want the ethernet line coming into t... |
H: Buck Converter - Coss Loss
From: https://fscdn.rohm.com/en/products/databook/applinote/ic/power/switching_regulator/buck_converter_efficiency_app-e.pdf
Can someone explain why the high-side MOSFET causes a loss due to its C_OSS. The charge from the C_OSS flows to the load, so why is it considered a loss?
In a sen... |
H: Will capacitors that are connected between GND and Vcc to a CPU impact the capacitance between the same pins on other components?
I am working on a pcb that has to have a CPU with capacitors between its gnd and vcc pins, other components like sensors also have to have capacitors connected to them for whatever rea... |
H: Problem with the output of a synchronous non-inverting buck-boost converter
I found this electronic circuit in an old research, along with the code necessary to operate it. When I applied it in the laboratory, the results were not the same as in the original research, not even close. The voltage on the capacitor is... |
H: Inverting opamp amplifier: frequency response not compatible with LTspice simulation
I have a simple inverting opamp amplifier and I want to study the frequency response of the circuit and finally calculate the frequency band (or cutoff frequency). Unfortunately the model created in LTspice gives very different out... |
H: Should two different DC power supply GNDs be connected to each other on a PCB?
I'm making a small project that drives a few DC motors with H-bridges.
+12V DC will come from one DC power supply (regulated to 10V for motors,) and then +5V will come from another (different) DC power supply for some logic controls.
Sin... |
H: Pulling pin low through PNP BJT?
I'm using a battery charger/buck regulator IC that turns on if the pin named "shphld" is momentarily pulled low, and turns off if the pin named "shpact" is momentarily pulled high. When the IC is on, it outputs regulated voltage on VOUTB. VBAT is always connected to the battery, the... |
H: Pulling Receiver Enable Low for RS-485 Transceiver is being transmitted as a byte in Modbus packet
I am running into an issue where pulling RE low on my Max3441EESA is appearing as an extra byte in my Modbus message. I am currently testing the Modbus capability of my PIC32 MCU with a Modbus slave program on my PC, ... |
H: Less than minimum charge voltage for NiMH battery and extra parts in a "simple" circuit
I was given the job of duplicating a "simple" box that monitors air flow in a duct.
It seemed simple. I dabble in electronics (I design and build industrial control panels, starts, PLCs, HMI, etc.)
I knew the guy who designed an... |
H: How to calculate capacitor size?
I'll apologize in advance as I'm sure this answer is already somewhere on the site. I don't have enough of an electrical background to know the proper terms to search for so I came up empty. I'm looking to install a diesel heater that draws 15A at 12V for about 2 minutes before drop... |
H: Can an output voltage of a simple comparator be higher than the input voltage?
This is a simple comparator circuit that I have built for a school project. However, for some reason, the output voltage tends to be higher than the input voltage of 12 volts(accidentally cut out in the picture, so it looks like 2V). It... |
H: Inductor of twisted pair cable and of a wire
I found two calculators on internet for calculating the self inductance of a wire and an other calculator for calculating the inductance of twisted pair.
Here are the results for the following parameters :
Diameter of wire: 0.2 cm
Length of wire: 100 c... |
H: Reading different CAN bus protocols with one interface
We have a system with multiple CAN bus protocols. All are running at 250 kbit/s. These are NMEA 2000, J1939, and CANopen. These systems do not have to communicate with each other, but I would like to read all their data.
Is it possible to link all these togethe... |
H: Is pad against pad enough for a good connection?
I have two PCBs that I need to connect together with holes or notched pins that I have to solder by hand.
In order to reduce soldering time, I've placed a few 2mm square pads on the bottom PCB and I'm thinking of placing another one on the top PCB, then after connect... |
H: Non-Schottky SiC diodes
Hopefully this isn't too much of a shopping question. I am looking for off-the-shelf silicon carbide P-N junction diodes, but all I can find are Schottky ones. Do P-N version ones even exist commercially?
AI: SiC pn diodes are not commercially manufactured for one simple reason:
They have a ... |
H: Identify this connector and 2.5 mm pin type
Can you identify the connector type, and more important the pins?
I was able to find NPP 2.5 mm pins that look the same, but apparently they are smaller than what I need... I'm attaching some photos for reference, the one on the left is the one I need (bigger one).
AI: My... |
H: Do we need differential routing TX and RX in Ethernet RMII MAC to MAC Connection
I am implementing an Ethernet mac to mac connection between SAMA5D27C-D1G-CU and FS32K148UJT0VLQT micro-controller.
In MAC to MAC communication PHY TX is connected to RX of MAC and vice versa as shown below.
In Ethernet,the RX and TX ... |
H: Are 24/12 V automotive ECUs 3.3 V under the hood?
My understanding is that MCUs (especially 32 bit ones) typically operate at 3.3 V. I have a 24/12 V, 32 bit automotive ECU (Bosch Rexroth Series 40). I've provided them as an example, but I'm asking generally about all automotive ECUs. Their datasheet includes a blo... |
H: Are all ESP32 GPIO available for use?
After watching many videos I would like to try to make my own ESP32 driven christmas LED display. But a few things aren't clear:
Are all GPIO pins available to me to drive LED's ? (Many video's/articles talk about alternate labels / roles for these pins). How many LED's can on... |
H: What happens if a 5 V 2.4 A supply is connected to a 21 gauge nichromium wire of 0.79 ohms/ft?
If I connect a USB power supply, rated for 2.4 A max. at 5 V, to a 1 ft 21 gauge nichrome hot wire (resistance 0.79 ohms/ft), what would happen?
Would the wire still heat up, but not much, or will my power supply fail?
AI... |
H: Automotive MOSFET active clamping circuit - LC ringing between coil load and MOSFET gate?
I'm trying to design a circuit equivavlent to fully clamped automotive MOSFETs (like the STP62NS04Z) using discreet, cheap and readily available IRFZxx MOSFETS. The goal is to drive a high impedance fuel injector which is equi... |
H: ATX power supply's "Power Good" measurement using oscilloscope
I want to measure the power good time of ATX PSU using an oscilloscope.
As far as I know, normal time for power good is between 100ms to 500ms. and it is measured according to the picture below, starting from PS_ON command.
So I measured PS_ON and powe... |
H: What is the definition of DDR memory latency?
On Corsair's web site, they define memory latency with an equation:
(Real Latency) = CAS Latency x 2000 / Data-rate
My question is what that means in practice. Is this the delay from the time the address is put on the DDR's bus until the first read comes back?
From th... |
H: SPICE Error in LM5117 Model in Microcap-12
I am trying to simulate SNVA829 (constant current constant voltage) schematic given in the application report from TI. I downloaded the spice model from TI site and imported it to microcap. When I tried to run the transient analysis I get the following error (seems it's a ... |
H: What type of surface mount diode is SOT-23 marked "JY L"?
What type of surface mount diode is this, SOT-23 marked "JY L"
AI: The part is most likely a BAV199L dual diode, datasheet here.
The key marking is JY, with L probably being a date code. There are several manufacturers who make this part with a JY code incl... |
H: Do LEDs turn on because of heat?
I was watching one of my seniors soldering a few SMD LEDs on one of his power converters. He touched the iron on the anode of one of the LEDs and it glowed. I think it is because of thermal generation.
Later, I heard him talking about the LED not glowing if a current limiting resist... |
H: Why do I get shocked from my laptop? How do I stop it in my own designs?
Recently, I noticed my MacBook gave me a small shock when it was plugged in and I only touched the very corner of it with my palm. It was fine if I gave it enough contact by resting both palms on the shell. Intrigued, I went to investigate thi... |
H: Resistivity: related to V/I or dV/dI?
The resistivity of Tungsten is given by \$\rho(T) \propto T^{1.209}\$ (from Paul Gluck's Physics Project Lab).
Let's assume that we can ignore the changes in the geometry of the wire due to temperature change.
Does that mean that for a Tungsten filament with applied voltage \$V... |
H: Why memory cell basis is typically "paired inverters" and not "paired forwarders", revisited
I asked over a year ago (link) about why memory cells typically use paired inverters instead of paired buffers. The answer mentioned gain, "this is basically because it's hard to make non-inverting gain elements and easy to... |
H: ELC AL-901 Bench power supply
what is the role of ic-1A, and D2-D3,
if the voltage variation is made by R11-R12, and the current regulation is made by ic-1B
thanks in advance
AI: This is a power supply manufactured by ELC, a French company, still in business in Haute-Savoie. The data-sheet is here.
The part that t... |
H: Auxiliary mechanical anti-ESD measures
If a PCBA within a plastic enclosure is prone to malfunctioning due to ESD air discharge in proximity of enclosure seams and openings, but changing the hardware or plastic design is not an option, what could then be steps to minimize the problem?
The typical system refered to ... |
H: Energy reservoir capacitor
How to calculate the appriopriate capacitance for an energy reservoir capacitor that would serve as an alternative IC power supply in case of main power supply failure. Is there a specific formula or a method to identify the right capacitor for the application?
The datasheet specifies a m... |
H: Changing a negatively switch circuit to a positively switched circuit with a PNP transitor
I believe I am trying to do something relatively simple, but I am not versed in this sort of thing. Please forgive any error in terms or diagrams.
I have a turn signal circuit for a motorcycle. There is one positive and one g... |
H: How can I remove DC from an audio signal?
I am trying to "isolate" an audio signal that is transmitted on top of a 24V (DC) power supply voltage.
This construct is used in door intercom systems from TCS.
The audio signal is the speech between the outdoor station/bell and the indoor terminal.
Can some one point me i... |
H: I have built a tube amp but the voltage drop doesn't work as expected
The original schematic had 180 V before the diode rectifier. Multiplied with 1.4 that makes 252 V. I could only get a transformer with 200 V, so I added a voltage drop after the rectifier.
I calculated to get from (measured) 286 V to 252 V(0,085 ... |
H: Using AC/DC transformer to step down voltage or as antenna balun
You can get an AC/DC step-down transformer like this from many electronic items.
There are two things I want to do with it:
Convert 6V or 12V DC to 3V or 4.5V DC, but it's not doing it. With the one I have, the input leads measure 133 ohms, that's n... |
H: How does this circuit work? BAV99 (3.3V for an ADC)
I'm having serious difficulties understanding how this circuit works. It's supposed to be around 10V at my test point with the voltage divider, but when I measure it, I get around 3.3V.
It's not clear to me how a diode can consistently reduce my voltage from 10.5V... |
H: How to reduce 24V to 0V-5V variable through a pot with an output current of 3amp?
I want to build a 5v variable PSU. I found one on ebay but the output current is not good for my application, 10mA.
AI: Getting generic variable supply to go down to 0V on the output is tricky, this is because the feedback is referen... |
H: What does it mean when device needs a voltage drop to function?
Sorry if this is a badly worded question, still learning electronics and don't know specifically what to ask yet.
I'm new to electronics and working on a problem that requires me to find resistor values so that a fan will work with a voltage drop of 5V... |
H: ATSAMD21E18A - Atmel ICE programming error
Recently I have designed my custom PCB board, which includes a SAMD21E18A. Unfortunately, I am having trouble with programming. I am enclosing the schematic (please ignore the quality of the schematic, it is still a work in progress). It should also be noted that all other... |
H: DC-DC Converter output: 6.21 V instead of 5.5 V
I am using a MGDSK10H5,5 in my design for generating 5.5 V. The MGDSK10H5,5 is an isolated DC-DC converter, but I am using it as a non-isolated DC-DC converter; I have shorted input and output grounds of this DC-DC converter.
When I measure the output it's showing 6.2... |
H: USB-C camera wired for USB 2.0 in circuit layout
I'm a bit confused about the USB 2.0 portion of a USB-C pinout.
We have two cameras that operate over USB-C, but they are also compatible with USB 2.0 because we can use them successfully through USB 2.0 when plugged into our laptop.
Our actual flight board will be c... |
H: Cascode BJT amplifier DC analysis assumption
simulate this circuit – Schematic created using CircuitLab
I am working on the DC analysis of a cascode amplifier.
If I assume base current is negligible I get the following equations:
From voltage divider:
Vb1 = (Rb1/Rb1+Rb2+Rb3) * Vcc,
Vb2 = (Rb1+Rb2/Rb1+Rb2+Rb3) * Vc... |
H: What happen when we parallel or series ferrite bead?
If I use ferrite with capacitor as pi network. What happen when I series or parallel the ferrite bead? Which one reject emi better?
I known the ferrite bead is not inductance. It act like resistor at high frequency why dissipate energy as heat.
But think about se... |
H: How to determine an equivalent RC circuit of a black box?
I've been given information about a "black box" device that I know is made of a simple combination of resistors and capacitors, and I've been asked to determine an equivalent circuit. I took an "Electrical Engineering for Non-EE Engineering Majors" class ma... |
H: Leaving the plug attached to the socket
It would be really helpful for me to leave the USB plug (the "brick") plugged into the power socket.
I would not connect the cable, which could potentially short if it touched a conductor, but only the brick itself, so I would plug the cable in each time I need to charge my p... |
H: Is it possible for this kind of solid state relay to drive high side?
I require a solid state relay to be able to switch high side, but also has low on-resistance.
G3VM has low on-resistance but it's application diagram shows exclusively low-side switch.
Question:
what is this configuration of FETs called ?
Sinc... |
H: I don't understand dimming on 3 quadrant TRIACs
Can someone help me understand how dimming works on 3-quadrant triacs? I understand they are great because they have higher reliability and don't need snubbers. What I don't understand is how 0-100% dimming can work if you can never operate in quadrant IV.
Ok so on a ... |
H: Why do speed sensors fail so often?
The typical vehicle speed sensor (variable reluctance sensor) is a very basic device which essentially amounts to a coil of wire wrapped around a permanent magnet.
Simple, yes, but very reliable? Apparently not so these days...
Years ago, I worked on some ancient airport CAT (cas... |
H: Can I divide a MIPI Clock between two MIPI CSI Cameras?
So, I'm facing this problem I have encountered while building a pcb.
I need to mount two MIPI CSI cameras (2 data lanes each) onto a chip that has 4 MIPI data lanes. The thing is, the chip only has 1 MIPI-Clock and each camera need its own Clock, how could I f... |
H: How enable for latch converts to clock in flip flop
Latch has enable signal and we cascade latches to make flip flops. How enable for latch converts to clock in flip flop.
I mean how and why enable driven latches form edge triggered flip flops. Why Flip flops are not enable driven, but are edge triggered?
AI: The l... |
H: Why is it not possible to measure PCB trace characteristic impedance using a multimeter?
I was looking into StackExchange posts for PCB trace impedance measurement.
How to measure trace impedance?
This posts clearly explains what the methods to be used for trace impedance measurement are.
I searched in many places ... |
H: How to configure / construct a CMOS sensor to act on changing signals only?
You all probably know how a CMOS sensor works, at least in general. In short, it consists of a lot of pixels (photodiode plus amplifier and so on), and each pixel is read out individually (different to CCD).
I have two questions now, a main... |
H: Inductive kick back
I have simulated two circuits, the switches are open in the beginning and closed and opened after that, because of back EMF the FET has high voltage on VDS for a moment. But one config has 63V as max voltage but the other one is just 6.8V. Why does this happen?
AI: So the plots show Vds.
When t... |
H: Which flyback diode for magnetic buzzer
I am a novice, and I'm playing around with SMD magnetic buzzers. For instance, the CUI CMT-322-65-SMT-TR.
In the datasheet they recommend something like this:
After some Googling I learnt the diode is a flyback diode, which prevents the transistor from being damaged when pow... |
H: ESC's Brushless Motor PSU and Maximum Torque
I am looking to purchase DC 12V 83.3A 1000W Power Supply and will use 4 brushless motors A2212 1400KV Brushless Motor. I have checked the Motors and they require 11.1 V and Load Current: 19.0A Power:210W. The ESC's will be 30a bi directional.
From my understanding the po... |
H: Switch to ground using transistor
I am building an AVR-based diagnostic device for my old Mitsubishi car.
To perform diagnostics you must short pin 1 (diag) with pin 4 (ground) on the car diagnostics connector to start a session; no problem with a paper clip.
But do I do this with a transistor controlled by an AVR ... |
H: Are two 2oz copper layers the same thing as one 4oz copper layer?
Let's say I want to use 4oz copper, but the PCB fabrication house does not have that capability.
Can I just use two 2oz copper layers, and route both of them to the same place?
Edit:
I am discharging a capacitor, and I expect very brief current spike... |
H: Common Mode Noise Attenuation
The question is below:
Your raw sensor signal is 6.5 mV, and you are using an instrumentation amplifier to process it. The amplifier has a CMRR of 80 dB and a differential mode gain of 40 dB. If the RF noise on the leads from the thermocouple sensor to the data logger is 79 mV, what w... |
H: When behavioral simulation of RTL works but synthesis/implimentation do not
I wrote a UART receiver similar to Nandland's example.
To verify that I am receiving and processing data (coming from my PC through Putty), I wrote a design that would correspond certain LEDs to certain keyboard letters based on their ASCII... |
H: Frequency Modulation - Why don't we modulate the carrier by multiplying message signal m(t) directly with f_car?
I am master student of computer science and I have got a problem/question from the domain of communication engineering. So: I'm listening to a lecture that's about Layer 1 stuff, and recently we discusse... |
H: How can water create a good ground reference?
In the 240V Single Phase panel in my home the ground bus is tied to a water line. My concern is water flows via a non-metallic pipe from the artesian well to a holding tank. A copper line connects the tank to a plastic housed membrane filter. After the filter begins a n... |
H: Passivity and Causality of PCB channel
We use S parameters to analyze a PCB channel. Once the S parameters are extracted, what I have seen is SI engineers will check the S parameters obtained are passive and casual.
I have some questions about it.
A PCB channel consists of copper traces. The trace has some resista... |
H: Does the negative voltage regulator emit noise into ground
I am designing an inverting voltage regulator using a LT3758 controller to generate -15 V from a 12 V / 5 V input. This is a non-isolated regulator.
My biggest concern implementing the design is if the regulator is going to inject any noise into GND because... |
H: How to design an EMI Filter for AC/DC PSU
I am designing a single phase MIL-STD-461 AC/DC PSU.
I have the following requirements to the PSU:
It needs to operate with an input voltage from 100Vrms up to 310Vrms.
Operating frequency 45-65 Hz
Current rating of at least 3 Arms (important for choosing inductors and CM ... |
H: Filter noise using MATLAB to include in LTspice
I have measured a voltage, and I need to include the .txt file in my LTSpice simulation. Before doing that, I first want to filter the noise I ended up measuring (see figure below).
How can I do that using MATLAB?
AI: So what you are after is filtering. However, you ... |
H: How to remove floating teardrops after removing the object they were attached to in Altium Designer?
I removed a via and the tracks connected to it after removing the associated net and this left the teardrops in place; impossible to select, and not getting removed with "remove all" in the teardrop tool. I also fou... |
H: Why do I have a sudden current peak when PWMing a valve?
I am driving a proportional solenoid valve with PWM from an MCU as follows:
The voltage of the MCU is 3.3 V. The gain of the amplifier is set to 20 V/V. Because the valve consumes 170 mA when fully opened, the maximum ADC voltage is 1.7 V with a 0.5 ohm resi... |
H: What are the advantages of an instrumentation amplifier over a single op amp amplifier?
Basically, strain gauges are going to be connected to a Wheatstone bridge and the output from the bridge will be amplified by an instrumentation amplifier. But what are the advantages of this over a single op-amp amplifier?
AI: ... |
H: STM32 PDR_ON Pin Internal Power Supervisor Explanation
I want to implement STM32F746NG on my PCB - the one from the STM32F746-DISCO with display and SDRAM, Flash and other peripherals.
The MCU has a PDR_ON pin, which I have never met before. I searched for it and found different threads and STMicroelectronics docum... |
H: Asymmetric sine wave
I've got a signal generator sending a sine wave to a PCB (X3). I closed jumper 19 so I measure D10, a GF1M diode. I measured the voltage over test point 16 (TP16) and the voltage over TP18. I get the following image on an oscilloscope. As expected we see that the voltage over TP16 is rectified ... |
H: How can I make this kind of hole or drill in Altium?
I'm trying to add this component to my design in Altium but I don't understand this kind of "holes" (I suppose it can't be drilled properly.) I can't find any tool in Altium to design this hole. Is there a way to do it?
I have tried to do 2 holes and put on one ... |
H: Will a synchronous circuit have a race condition if not all inputs arrive before the clock rising edge?
Suppose that the circuit has several inputs from an external circuit which do not have an effect until the clock next rise edge due to using synchronous flip-flops. If the external circuit sends several inputs an... |
H: How to derive the transfer function of this op-amp?
For the 1st question, is this a Sallen-Key filter? What criteria must a circuit possess in order for it to classified as a Sallen-Key filter? I searched the internet but found no clear answer.
For finding the frequency: my attempt, see below, defines node voltage... |
H: Impact of Bandwidth Increase on Shannon Capacity
What is the impact of doubling of bandwidth on Shannon Capacity, assuming noise power spectral density and signal power remain the same?
AI: Recall the statement of the Shannon-Hartley Theorem, which gives a theoretical bound on the channel capacity1:
$$C = B \log_2\... |
H: Arduino NANO heating issue
I am trying use a HMI display with arduino NANO. I am powering arduino and hmi display ( topway 5 inch smart display ) with 9 volt adaptor. everyting works fine. but if I plugin the Tx, Rx pins which are coming from rs232 ttl converter (this device) to arduino nano's Rx and Tx pins, ardui... |
H: How important is a PCIE_PEG_TXN pin on a motherboard?
I managed to break the PCIE_PEG_TXN 2 pin on my motherboard according to this pin layout: https://sector.biz.ua/docs/lga-775-1150-1151-1156-1155-1366-2011-pinouts/s1200_1.png I am curious if it is wise to start the computer without this pin. I assume it is for s... |
H: Exporting LTSpice waveform data from Monte Carlo simulation and manipulate it in MATLAB
So I am doing a Monte Carlo Simulation on LTSpice. Then I want to export my data and manipulate it in MATLAB.
Here is a working example file, just with 2 decades each one with 11 points and 6 iterations of Monte Carlo:
Freq. V... |
H: How to safely *temporarily* wire 120v?
I am wondering if there is any device to safely create a wire connection?
More specifically, here is my most recent situation: troubleshooting a noisy 120V electric motor (fireplace blower). The motor had a proprietary 2-wire plug which connected to the fireplace wiring, but u... |
H: Find RL circuit average power when no AC amplitude is given
I am asked to find the average power of this RL circuit, assuming that \$R\$, \$L\$ and the frequency (\$\omega\$) and phase (\$\phi\$, can be zero) are given. But nothing is said about the amplitude \$A\$ of the alternating current source.
I can calculat... |
H: Efficiency of green High Power LED compared to efficient white
Whenever I see color High Power LEDs (for example green 3W on Star) I see disappointing efficiencies:
For 520 nm the theoretical efficiency is 683 lm/W * 0.88 (green) = 601 lm/W. But most are described with 110 lm / 3W (Example)= 37 lm/W which is a conv... |
H: PCB clearance/creepage with dead metal
I have PCB design where there are two pads the may be shorted (manually in assembly) or left as is, depending on the product model. The through hole circular pad is actually for a terminal block. I wanted to maintain ~3mm clearance between CN3 and CN8 since there is at least ... |
H: How to handle the DC charge input on the PCB for a symmetrical 5V magnetic charger cable?
I'm working on a low voltage DC consumer product that specifies using a specific magnetic charge cable on the 5V input instead of a regular USB connector. See image:
We started out assuming the cable wasn't symmetrical and th... |
H: Is it possible to use two DC-DC boost converters in series from separate DC sources?
I was wondering if I could put two DC-DC boost converters in series.
Each of these converters is fed from a DC source which is basically a USB charger of 230VAC to 5VDC/1A.
The voltage output of these converters should have some fi... |
H: LTspice diode bridge rectifier input oscillating
I've made a LTspice model of a diode bridge rectifier, but when I simulate my circuit, the input voltage is oscillating.
Here is my schematic, along with the simulation result of the voltage at node 3 (marked with an arrow.)
When I zoom in on these weird parts, I ca... |
H: Problem with the simulation of two different low-pass filters
I am trying to simulate the circuit below. Why do both low-pass filters show the same behaviour, even though their component values are different?
Edit: How stupid of me. I used the label "In" for the both circuit. That is the why I got same result.
A... |
H: Does CT act as a constant current source for a specific primary current?
I connected several resistors (1, 10, 100, 560 Ω) at the output of a 1000:1 CT (0-100 A measurement). I saw that the secondary current doesn't change for different resistors for a constant primary current. If the current is constant, then I2R ... |
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