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H: High-current analog switch
I'm looking for an SPST analog switch (or alternative device) capable of handling >=150mA (5VDC) across its switch, controllable by a logic-high signal. I've been looking on digikey, and haven't had much luck finding anything capable of handling more than 25mA (it's also been tough as the... |
H: use minimum number of NAND gates to realize this boolean expression
How should I proceed to find the minimum number of 2 input NAND gates to realize this boolean expression. I am allowed to use both complemented and non-complemented inputs.
$$F = X.Y + Y.Z + \overline{X}.\overline{Y}.\overline{Z}$$
AI: You can walk... |
H: Self Biased Current Reference
I'm studying this circuit:
The author of my book says that the purpose of this circuit, called "Self Biased Current Reference", is to generate a current almost independently of the supply voltage. He also says that, if M3 and M4 are perfectly equal, than I1=Iref. Then it follows that:... |
H: Data transfer from/to memory
Consider an interface (between a memory and a processor, or between a memory and an ASIC, or similar situations) in which there is a data bus of 8 bit. Suppose I want read a 16 bit data from memory, and that it is stored in two memory's cells of 8 bit.
Which is the part of data that w... |
H: View RTL/netlist/schematic with Icarus Verilog
I am learning Verilog and using Icarus Verilog for compilation and simulation. Is it possible to visualizate result somehow as a schematic, RTL etc?
AI: Unfortunately Icarus doesn’t seem to have an up-to-date synthesis flow, which you would need to visualize your RTL a... |
H: USB type c receptacle plug in detection
How does usb device with type-c receptacle detects, that plug (just bare usb type-c plug, without cable, and resistors) is attached?
Does USB specification describe this possibility?
I know, that my phone(sm-520f) somehow detects plug insertion, because I'm able to read MUIC ... |
H: Question about a CMOS operational amplifier
I'm studying CMOS op-amps. At the very beginning of the chapter, the author of my book says:
"obtaining low output impedance can be problematic. Nevertheless, the typical use that we make of op-amps in integrated systems does not lead to a strict request for low output im... |
H: 3 Resistor Voltage Divider Formula
I'm trying to analyze this circuit and spend almost 2 days to make a formula for it but I don't get it , anyone know what it's called or how can I make formula for it ?
I want to calculate I1,I2,I3 currents but their rotation change at certain points .I used the mesh currents met... |
H: Breadboard and XOR gate not working
simulate this circuit – Schematic created using CircuitLab
70I am trying to make a circuit in which the switches will determine the outputs for the xor gate however when i used the switches it is giving me the opposite outputs. For example, a 1 & 1 should give a 0 but i am gett... |
H: Arduino AREF pin
In Arduino UNO R3 official schematic the AREF pin is not connected to anything:
While in most online Arduino schematics (such as this one) it's connected to a 100nf capacitor and then to the ground, the other two differences are a 100nf capacitor between VCC pin 7 and GND pin 8 and a 10uH inductor... |
H: How should i charge 3 lithium ion batteries?
I'm new to battery charging and I was wondering. What is the best way to charge and manage 3 18650 cell batteries? The load is about an amp and I have a 3.7 amp power supply to charge them. I'd like to be able to charge the batteries and also power my device.
I plan on u... |
H: Where should I put a 3.3V Voltage Regulator?
I've stumbled across lots of schematics and one thing that I find is almost never consistent is where a certain regulator should go. I'm going to be using the LM1117 series. Should the 3.3V regulator go on the output of the 5V regulator, or should it be seperate from the... |
H: Why reverse connected MOSFET start to turn on at Vgs
The circuit shown below is implemented using two AO3400 N-MOSFETs.
AO4300 datasheet here.
The right-hand MOSFET is connected with normal polarity (Vds is positive),
while the left-hand MOSFET is connected with reverse polarity (Vds is negative).
The graph at ... |
H: Multi valued Relay Ratings
I am not much experienced using relays. Earlier I used any relay with any setup just for the purpose of building something. But now I wish to make efficient and safer projects. For that purpose I was studying about the ratings associated with the relays .
This relay from Goodsky was havi... |
H: When placing a new line it doesn't get assigned a net, how to fix it in Altium?
I had this working well before, but now, every time i'm placing a new line from a component, it never gets assigned the net.
In the Net field it is always "No Net", which forces me to manually place the name of the net everytime.
How ... |
H: How much current does this read?
How much current is flowing here?
AI: The left most position is 0 for currents, the right most if the range value,
So for the 500mA range you would be looking at the lower black range and times any reading by 10,
So in this case, you would be reading 120mA |
H: Finding a Fourier series of a Burst Fired sine wave having consecutive 2 cycles on & 2 cycles off?
I have been trying to find the solution of the following problem but with no luck.
I have a system that generates a waveform of sinusoidal type with the only difference being that this wave has 2 cycles on, 2 cycles o... |
H: 60A current drain on supercapacitors in series?
We have a project to build an RC car from scratch and are only allowed to use NiMH batteries, no LiPo. We're hoping to power the car with an EDF (https://hobbyking.com/en_us/durafly-vampire-v2-rcaf-edf-and-motor.html or similar) which runs at 4s or ~14.8V, 60A. Instea... |
H: What would happen when supplying lower voltage against boost converter?
I'm new in these field. So, help please :)
3 Questions about buck-boost dc-dc converter, the module is: XL6009. I've seen this: Behavior of Boost and Buck Converters
What would happen when supplying higher voltage to boost (step-up) converter,... |
H: Transient current capacity of sacrifical Zener diode
The common wisdom is that Zener diodes are suited for only very low power surge protection because of their low current capacity.
But what about where it was used as a sacrificial device for clamping transient spikes?
Surely there would be a very brief period (ie... |
H: How do solar inverter systems easily add AC power sources together?
I understand DC power more than AC power. I know that given multiple DC power generators, easiest way to sum them is by connecting them in series. In paralel you'd need every generator circuit to protect itself from reverse current coming from othe... |
H: How to control 12 DC motors simultaneously with Arduino Uno?
I am using Arduino Uno.
I need to control 12 dc motors rated voltage 9V and current 150mA.
definitely, I will use MOSFETs and back emf diode for each PWM output.
I need to know whether I can use a 74HC4051 multiplexer to multiplex a single PWM output fr... |
H: What is the difference between DRAM channel and DRAM Rank?
Can someone explain me the terms : DRAM Rank and a DRAM Channel is simple terms.
I went through this PDF and I was not able to understand the DRAM Organisation/architecture on page 3 and page 11. Can someone help me understand those block diagrams.
I have s... |
H: BJT to aid switching a MOSFET
I am trying out the following circuit, I want to use the Arduino so that I can more easily program pulses to drive my load. I was previously using a function generator (FG), but for some reason it won't save my programmed pulses and it's time consuming to have to individually program 1... |
H: How to reduce voltage from shift register to ESP32 MISO pin?
In this circuit I have sensors that are rated for a minimum of 6V connected to a 74HC165 which passes its output to the MISO pin of an ESP32. I was hoping a simple divider to convert the 6V from the shift register to 3.3V for the ESP32 would work ... but... |
H: Interpreting results of a thermal camera - what should I expect to be hot?
I'm not a trained electrician, but I got my hands on a thermal camera to play with. Its existing documentation didn't help me quite understand what's going on when I see a hotspot. What components can I ignore when they get hot? What compone... |
H: Is the purpose of an internal resistor in a practical voltage source to set the maximum possible current that can be drawn?
Going off the example circuit I attached below, is the purpose of an internal resistor to limit the maximum current that the voltage source can output? Since adding any passive component in se... |
H: Why is the LT3080 input voltage limited to 36V?
The LT3080 is a current source based generator, that is, the reference voltage is set by the fixed 10uA flowing through the adjust pin and its external resistor. If so, I don't see (according to their schematic) why they say the input voltage is limited to 36V. Suppos... |
H: Effect of output inductor DCR on switching power supply
I'm not an EE but I'm attempting to gain hobby levels of the skill. So I'm building a DC/DC power supply as an exercise. I built a PCB design for a TI chip (TPS560200) with associated passives based on the information in the datasheet. After sending the PCB... |
H: Generating negative voltage rail using P7805 DC-DC converter
I need to create a negative voltage rail (from positive supply rail), say -5V to keep a P-MOS transistor in ON-state even when the voltage on its [S] source is 0V. So I found this schematic in an answer of another question here, but does this actually wor... |
H: Differential equation for a notch filter RLC circuit
I'm trying to write and solve a differential equation for this simple RLC notch filter and I'm not sure what I'm doing wrong.
simulate this circuit – Schematic created using CircuitLab
So first, I apply KVL to (1) the loop source-resistor-capacitor-source and (2... |
H: ORing, cascading and reverse polarity protection for power inputs
I'm trying to design a circuit that could be powered by an USB host OR by a wide voltage range power input. These are my requirements:
the USB rail (VUSB) should be obviously protected from the auxiliary power input (VIN)
VIN should have priority ov... |
H: What is the expression for collector current (Ic) in function of CTR for optocoupler?
I'm just asking about expression for collector current (Ic) of optocoupler in function of CTR because my simulation results doesn't fit with the CTR=Ic/If equation.
Simulating the part CNY17-3 with the characteristics described on... |
H: What does % of Population mean in a datasheet graphic about voltage output
I was checking a 3-axis accelerometer sensor an I found out this one https://www.digikey.it/it/datasheets/analogdevicesinc/analog-devices-inc-adxl335
Reading the datasheet, on page 6 under TYPICAL PERFORMANCE CHARACTERISTICS, all the graphic... |
H: STM32 I2C transmitting no data and cannot change the data that is being transmitted
I am trying to establish a SMBus connection by using STM32 chip. When I try to transmit data to battery (0x0D) I see 0x0B with oscilloscope. When I change the data that is being transmitted to 0x00 or to 0xFF nothing changes. The da... |
H: Measuring veloctiy by detecting objects with an analog sensor
I have a sensor (DRV425) which outputs an analog voltage. The voltage level changes to a lower voltage when the sensor pass an object. Please take a look at the screenshot. It shows the output signal of the sensor after passing 6 objects.
The length of ... |
H: RLC circuit: how to find voltage/current derivatives and derive differential equation
Trying to resolve differential equations for RLC-networks, I'm always stumbling upon the voltage/current derivatives. Here I would like to give two examples from the same textbook and explain my problems.
Please consider the follo... |
H: MOSFET and TVS Voltage requirements for 120V single phase AC circuit
I am designing a circuit that will gate single phase 120V AC through back-to-back N-channel MOSFETs connected as shown below. When passing AC, one MOSFET is on and the body diode in the other is forward biased. The active MOSFET changes for the ... |
H: figure of merit for oscillators
Can someone explain to me what means figure of merit in terms of an oscillator?
There is no explanation online related to this.
AI: A Figure of Merit (FOM), for anything, is a benefit/cost ratio that's found useful to express the 'value' of a particular component. You choose a wanted... |
H: triggered PWM from ADC end of conversion
I am making a full bridge control on D-SMPS and I want to trigger PWM from ADC to keep output voltage constantly stable. I am using STM32f103xx as microcontroller. The problem is that looks like in ST's MCUs does not provide a trigger for PWM from ADC. So how can find the ri... |
H: Heating vacuum tube filament via capacitor
As I understand vacuum tubes (like triode / pentode) usually are designed to be heated with certain current through the filament.
And usually it is about low-voltage and comparatively high-current. E.g. 6.3 V at 300mA.
Schematics I usually find around use transformer to ge... |
H: Fan speed and power consumption
Really basic question that I've struggled with for a while. In low-cost fans, a series of mechanical buttons select fan speed. I assume each button is connected to a specific resistor which limits the current/divides the voltage to the fan motor, depending on how they are arranged.
M... |
H: Op-Amp Non inverting mode
I know how the non-inverting configuration actually looks but I wonder why it can't be identical to the inverting mode (regarding connection of resistors). The feedback is the major issue I can see here but just for mathematical calculation of gain, this modified circuit would still produc... |
H: Determine Correct Capacitor Value
I am just a hobbyist attempting to place some remote battery-powered Arduino sensors around my home and needed a way to save power when the sensor is not taking a reading.
Initially I was using the DeepSleep function, but through more searching I found an example sketch & schematic... |
H: Is it possible to mix split and single-supply circuit sections
I'm making an audio synthesizer which works with single supply. Now I'm interested to include a section that uses dual-supply (a filter using LM13600).
I'm thinking that it could be possible to do it, and I will scale and offset the dual supply part ou... |
H: Consequences of leaving unused inputs of clock buffer floating. Alternative: best practice
I'm using a Si53342-B-GM
Original datasheet download at silabs for the si5334x-series
as a clock buffer.
In some cases I only need to distribute a single clock signal and in some of my cases I only have a single ended input ... |
H: How to use a MOSFET driver directly to drive DC motors with PWM?
I need to control a DC motor runs at 9v with PWM signal 3.3V vpeak.
I found MOSFET driver noninverting MCP1401.
Can this MOSFET be used directly with a Back EMF diode (diode as usual across the motor terminals)?
The motor current rating is 200mA a... |
H: How can we find the value of beta for a transistor to enter in a saturation region?
How can we find the value of beta for a transistor to enter in a saturation region?
For this, the existing value of beta is 50.
AI: If I would answer your question strictly, I would not care about input signal at all.
So you are no... |
H: Is that any best way to measure High side mosfet drain current?
To be specific, I am using 6 MosFETs (for ex. PSMN030-60YS) to drive an inductive load. I want to measure drain current of High-Side MosFETs. The way I am doing right now is by lifting the MosFET mounting base (drain pad) and attaching a small loop as ... |
H: Voltage Multiplier: step by step explanation
I do not understand how this voltage multiplier circuit works:
wherever I have read (also Wikipedia), I have not found a step by step explanation. I do not understand if the voltage drop across the diodes in conduction is negligible or not, and in general I need to unde... |
H: I have to find all the voltages and current in the circuit
I am given Uab=100V
XL=6Ω
XC=3Ω
R=4Ω
This is how I started
X=XL+XC=9Ω
Ztotal=sqrt(R^2+X^2)=9.84Ω
Zab=R+jXL=4+j6=7.21∠56.30
I=Uab/Zab=100/7.21=13.86A
but obviously I made a mistake somewhere
U=I*Ztotal=13.86*9.84=136.3V
Uc=I*Xc=13.86*3=41.58V
UL=I*XL=83.16... |
H: What contacts do the numbers on this DPDT relay refer to?
I’m new to electronics, could someone please list the contacts that belong to each number. e.g. COM1, COM2, NO1 etc.
It’s a Taiss/JTX-2C, MK2P-I DPDT Power Relay with Plug-in Terminal Socket Base, DC 12V Coil, 8 Pin 2NO 2NC (Quality Assurance for 1 Years) DC... |
H: USB3/2 hub cascading (reverse hierarchy)
I want to implement multiple USB ports using one USB3.0 and one USB2.0 hub with four ports each.
The microprocessor I want to implement these ports for has just a single USB3.0 port left (of which the USB3.0 PHYs port is muxed and routed separately through a SerDes. The USB2... |
H: Supplying an MCU from 110 or 220V line
I've been struggling with this for a while : am looking for a way to power an ESP32 microcontroller (at 3.3V, or 2.6-3.6V) from a 220V line.
I am trying to do this using only my home'e electrical wires (no plug, so can't use a USB charger).
The question I'm looking an answer f... |
H: How does one calculate the values of LF1&2 and C93?
I am learning about USB circuitry and one of the example schematics uses this lc low pass filter. I want to understand where these values came from? Thanks in advance. Link to article
AI: tl; dr: The designers didn’t calculate anything really. They likely just fol... |
H: What's the simplest way to calibrate a thermistor?
As a hobbyist who don't have access to lab equipment, it really seems impossible to me to be able to calibrate the thermistor that i have.
Of course there are calibrated temperature sensors like DS18B20, but thermistors specially on slow MCUs like Aruino UNO (compa... |
H: Transistor series regulator heating
Hi friends i am trying step down converter using transistor.
Application:
Micro controller power-supply = 3.3 volt
Input battery supply range = 10 - 13 volt
So i use BD139 for stepping down from 13 to 5v and the using 3.3v regulator.
Circuit works fine and i connected my... |
H: Mosfet Regulator heating issue
Guys i trying to step down voltage using mosfet.
Application:
Input battery supply 40 to 50 volt
Output voltage is 12 volt not more than 500 ma.
Mosfet heating issue due to...
Since the mosfet is dropping voltage 37 volt (50v-13v), if output load consume 500ma. Then power dissipat... |
H: Can't understand what multiplexers do in CPU datapath
I'm currently learning about data path in a CPU and having a hard time understanding the functionality of G,L, H parts in the following image. Why have those parts been used there?
AI: G multiplexer: Selects the second argument to the ALU. Possible values are an... |
H: What AC mains phase information can be deduced from measuring at two distinct devices, connected via ethernet?
I a have a house with 3x20A grid connection. With the usual big loads like washing machines, kitchen. For each socket in the house (many...) I want to determine the phase a wall socket is connected to in a... |
H: MXR Distortion + guitar pedal schematic - meaning of +4.5V
I found this schematic of the "MXR Distortion +" guitar pedal.
I am trying to rebuild it, but I have some doubts about this +4.5V in the bottom left corner.
What does it mean?
I mean, I have only 1 power source: a 9V battery, so how should I add a 4.5V?
So... |
H: Heat output from a 200W electric radiator?
I am looking at installing an electric towel radiator. The heating element is 200W.
Dose that mean that it would both:
Use 200W of electricity.
Provide 200W of heat output to the room.
AI: Yes, electric heaters are basically a resistor.
A resistor converts electric energy... |
H: Current on each winding of a solenoid and wire selection
While I was reading an article about inductors and air core solenoids in general, I came across the term voltage per turn. Until then I thought that all of the windings of a coil are a continuous wire having the same current. But this term made me wonder that... |
H: Why do IR remotes influence AM radios?
When I put my IR remote near any AM radio and push any button on the remote, I can hear a sound from the radio speaker (like beeping). This phenomenon is very weird for me because the radio has no IR receiver inside.
On the other hand, the frequency of the AM radio is more tha... |
H: XT90 with AWG 10 wire?
XT90 plugs support up to 90A continous current and up tp 120A for short bursts.
On the other hand the only allow AWG 10 (5mm²) wires. AWG 10 is rated for ~50A
https://www.engineeringtoolbox.com/wire-gauges-d_419.html
https://www.elektromodellflug.de/hochstrom-st.-bu..html
How is this save? Is... |
H: Fluctuations in 7805 Regulator IC Output
I built an Arduino using ATmega328 on perfboard. To power it, I used an 8V adopter with a 7805 IC. But the ATmega328 IC started to reset randomly. After some efforts I figured out that the problem was not using decoupling capacitors. So I used a 100uF and 10uF electrolytic c... |
H: STM32 cannot reach individual registers and pins as PIC
I used to work with PIC and now I need to use STM32 chip. I was using HAL library but it gave me some problems so now I want to use it without HAL_Library. There are some questions I could not get any answer.
In the datasheet of any PIC there are registers an... |
H: How can I run an STM32L with an unpowered ST-Link connected?
I have an STM32L476RG on a custom board that I have to leave connected to an external ST-Link/V2 so that I can reprogram it without accessing the hardware. I'm also forced to do this via a USB hub due to my limited number of available outputs.
Right now t... |
H: Unexplained amperage spikes
IT guy here - I have a device called a WattBox in one of my networks so I can remotely cycle power on an outlet. It also provides me with alerts when something falls outside set parameters.
I've been getting amperage spike warnings from it - normal draw is ~3.2A, and it'll spike up to 2... |
H: Help me clarify max ratings and microcontroller pins tolerance
I use an Arduino Due which is rated 3.3V as a kind of waveform oscilloscope to display signals on my PC. As I knew I had to scale my signals to 3.3V to avoid damaging the analog pins.
Here is the warning on the Arduino Due specifications page:
Warning:... |
H: Why does `buck` mean `step-down`?
I just read about buck converters and boost converters and buck/boost converters. Great stuff.
But, why is a step-down converter called a buck converter?
I tried to research this myself. According to Google Book search, the phrase buck-boost transformer was in use at least as ear... |
H: Question about feedback in a current reference
I'm studying the following Vbe-based current reference:
The author of my book says:
Observe that the circuit has two feedback paths around the gain stage. One positive, the other negative. Assuming transistors M1 and M2 matched, equal
currents are injected into R a... |
H: Cascaded common emitter amplifier
Im trying to design a cascaded amplifier with 3 common emitter stages.
As long as the input AC voltage is below about 20mV the amplification is fine, as you can see on AMP1.
But the output of AMP2 is also maximum at 20mV and and goes much below zero. AMP3 is also maximum 20mV.
Th... |
H: Can two 802.11n devices communicate via a coaxial cable?
Coaxial cables with RP-SMA connectors are often used as extensions for external antennas / with software defined radios.
What would happen if I were to connect two access points (wifi chips, via their antenna ports) using a coaxial cable? Would they be able t... |
H: Need help identifying SMD component
This is a board from a Johnny Lightning V-bot, it has these SMD 6 pin components that just have a M03 and a dot on one of the terminals. Does anyone have a datasheet or any idea on how to ask for one to replace it? It helps with switching direction on a motor that transforms the ... |
H: Transistor Gain Values
I am design a transistor switch circuit.
Ic = 1mA-30mA
Ib = 1mA
Vce = 7V-18V
This is the transistor which I am going to use as an NPN Switch
Can someone tell me how to read the Fig 7 graph. In the graph, the gain value is fixed at 20.
But according to my application, Max Ic/Ib = 30. How to ... |
H: Can we calculate the upper bound of needed power from some information from datasheet?
This is a energy harvester product data sheet, and we can know some information below
https://www.powercastco.com/wp-content/uploads/2016/12/P1110B-Datasheet-Rev-4.pdf
1.\$V_{out} \$ current = 100mA
2.\$V_{out} \$ voltage = 4.3V... |
H: MC34063A step up voltage converter
i need change 5v to 12v that it use to supply a device;
for this use MC34063A step up voltage converter;
this site can calculate the parameter.
i have problem all thinks is OK but i have same voltage at output!
how to find my mistake ?
AI: Pin 2 is not grounded so it does not work... |
H: How to build loss-free inverter?
I would like to create an inverter because I would like to have an inverse switch, that is: my circuit should only work when some signal current does NOT flow. This is even mechanic: When a certain switch is NOT set, I want no current to flow at all.
The only idea that I have right ... |
H: Termination of SY cable shield at VFD and 3 phase motor?
I am wiring a single to 3 phase VFD to a 3 phase motor (240V delta). The 3/4HP motor powers a lathe in a domestic setting. Supply voltage is 240V 50Hz.
As per the VFD instructions, I am using shielded cable (SY 3 core plus PE) between the VFD and motor and h... |
H: What does it mean to "swamp" a radio signal?
Context: It frequently happens that when a particular brand of RC transmitter and receiver are too close (within a meter) the two units lose connection. The recommended fix (which works) is to move the two units farther apart, and the explanation usually given is that t... |
H: Why does my Atmega328 clock seem to be off by a factor of 2?
I have an Atmega328 chip I am trying to debug. I have a sketch that blinks an LED and echoes back things received over the RX/TX pins. I am using the "Import Arduino Sketch" feature in Atmel Studio 7. I want to use the internal 8 MHz clock.
The timer seem... |
H: Op-Amp settling time in bits
I was reading through this and was a bit confused. What do they mean by
"took forever to settle to 10-bits (0.1%)"?
How is 10-bits = 0.1%
AI: A 10-bit binary number can take on 210 = 1024 values.
Therefore, if you want something to settle "within 10 bits," you're saying that it needs ... |
H: 74LS181: Maximum output current?
It seems that I fried my 74LS181N ALU, though I'm operating on 4.95v and have a 1k resistor (plus LED) on all output pins. I was sure it could handle those 5mA, but the datasheet suggests an output current of max 0.1 mA.
Im I misreading the datasheet, is it realistic that the ALUs ... |
H: Calculating Capacitance / Rolloff Frequency for Across the Line RFI Supression
I’m in the process of restoring my first All American Five (AA5) tube radio – in this case, a GE Model 115 from the late 1940s. As I’m getting ready to order replacement capacitors for it, one of them (.05uF, 600V rated) sits across the... |
H: Choosing PLL Loop Filter Bandwidth and Phase Margin for Frequency Ramp Generation
I am new to PLLs and am trying to use one to generate a frequency ramp between 5.725 GHz and 5.875 GHz. I have found tools online that help design loop filters for PLLs, and all of these tools require that the user know the desired lo... |
H: Which has less energy loss - AC step up/step down transformers or DC to DC step up/down converters?
In the EE field, AC transformers are constantly talked about. However, I don't hear much of DC to DC converter modules, even though DC is widely used today, mostly in smaller electronics.
Both of these perform simil... |
H: 8/16/32 Bits of microcontrollers
I am new to the field of embedded systems. Recently I was learning about the differences between different bit size (8, 16, 32) microcontrollers. What I found was that the size of bit indicates the memory addressing capacity, data bus and address bus size etc. Every other website ha... |
H: Shielding and Ground Loops - RF panel jacks for GPS
I've been working on a design that requires me to pass an RF signal through a conductive panel. I'm using SMA jacks for that purpose as they're readily available and also available in an isolated configuration like these. The reason I'm using an isolated jack is... |
H: Can copper pour be used as an alternative to large traces?
This is a general question, but if I am designing a PCB that needs a trace width of 110 mil, would I be able to use the copper pour instead of drawing out the large trace? The reason I am asking is for PCB's that have a lot of components that don't allow fo... |
H: What can I use to supply 220V DC to this motor?
I have a small 220VDC motor I would like to drive via a speed controller, so I can continuously adjust the speed. I'm in Australia with 240V mains, and I also have an adjustable 0-220V AC controller. It seems to me the missing piece is a rectifier to take the output f... |
H: Why are delays required in verilog with combinational logic?
I have been getting into FPGA programming and Verilog and have been playing around in EDA playground for a bit creating some simple stuff. Often I need a clock so what I do is generate one on the testbench side using:
for (i = 0; i < 1000; i = i+1)
begin
... |
H: What does quiescent power mean and how I can find how much current the chip consume
I was checking this datasheet about a multiplexer. It says:
This device handles rail-to-rail analog signals and consumes less than
4μW of quiescent power.
Checking the tables below it says that Off-Leakage Current is about a cou... |
H: 3.3V very low power consumption buffer for sensor output
I'm designing a portable Ozone meter with an Arduino that read the data from the sensor and send it via LoRaWAN. I've found out this sensor that seems perfect for what I need.
My device runs at 3.3V and must have very limited current consumption. On the datas... |
H: How the Cerebras across the reticle limits to produce the largest chip,WSE?
How are the connections made on wafer-scale circuits (50,000 mm2 and up), given that the imaging reticle limits are around 600 to 800 mm2?
AI: The "reticle limits" you allude to refer to the area over which the optics can maintain the highe... |
H: Cheap oscilloscope showing 16 MHz square wave
I own a cheap oscilloscope Hantek DSO4102C. It's rated bandwidth is 100 MHz, and sample rate is 1 GSa/s. Some info about the tool can be found here: http://hantek.com/en/ProductDetail_3_4163.html
Now I have an Atmega328P MCU running from an external quartz at 16 MHz, wi... |
H: Verilog code to drive a signal high always
I am learning Verilog fundamentals recently. I want to drive a signal always high using reg. I wrote this and it didn't work.
reg b;
always@*
begin
b <= 1'b1;
end
b is always 'X' in simulation.
In VHDL, I was able to do similar thing:
signal b: ... |
H: LM2902N short circuit
I am using the LM2902 as a voltage follower. I recently discovered one of the wires to the input pin of one of the op amps was crimped In a tight spot and bare wire was touching the ground intermittently.
This was discovered because anytime the sensor was hooked up to op-amp 3 of the IC, its ... |
H: MAX11612 to replace ADS1015
I'm looking to replace an ADC chip from an ADS1015 to a MAX11612. Currently I'm using an Adafruit ADS1015 breakout board, but I need an ADC that is truly bipolar and reads significantly faster (>10kSPS). I think a MAX11612 will do the trick. The AIN voltages will be +/- 7.5 volts (bet... |
H: Why not nickel-plated edge connectors?
The tracks used as an edge connector are gold coated to improve contact with the female connector: bare Cu oxidizes, and also wears out if they are inserted and removed repeatedly. Au cannot be applied directly to Cu, so electroless Ni + immersion Au (ENIG) is used.
Well, the ... |
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