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H: Moving Coil Circuit
My wife and I are planning a Robot themed room for our 1st child which is due in May. My goal for his, yep its a boy, room is to make a wider variety of sensors that will hang on the wall that will each display a different input.
For my first sensor I want to build a simple sound measuring devi... |
H: References with explanations of how works CORDIC algorithm for division
Does anyone know any available reference to learn how works CORDIC algorithm to implement a division?
AI: This is an excellent article written by someone on the Parallax forums, called CORDIC For Dummies. Well written and explains things nicely... |
H: How to break out Board to FPC connector
I'm trying to (hopefully) reuse a smartphone LCD and touchscreen controller, among some other components.
The first step is to break out the tiny connectors on the board. It appears to be 2 board to FPC connections. See picture here: https://i.stack.imgur.com/jctIv.jpg (botto... |
H: Measuring Resistance/Impedance with SPICE
How does one measure impedance/resistance using SPICE? I have access to regular SPICE(MacSpice) and HSpice.
The DC current divider circuit at the bottom of this webpage seems to be one method. 0V DC sources are used, and the current through these zero volt sources is meas... |
H: How to check the CAN bus is free or not
I read a lot of stuff regarding CAN bus arbitration, but it didn't answer my questions.
If one node is already transmitting the data on the bus and in between another node wants to initiate the data transfer, how will that "another node" get to know that the bus is busy?
All ... |
H: System Generator: How to configure the CORDIC divider block?
He all, I was wondering how should be the parameters fo the CORDIC divider block in order to get proper results.
In this example I´m trying to get 0.1/0.2 = 0.5 but I don´t get it and I don´t know why?
Please, does anyone know how to do it?
Thank you!!!
E... |
H: Don't understand how these resistors operate in this circuit
When reading a manual on using a PICAXE and an I2C device I saw this diagram.
I can't work how this would behave as wouldn't it make the connection on the lines constantly high due to the connection to the power rail, so never goes low. I understand that... |
H: Particular JTAG to program/debug MCUs from different companies or architectures
Althougth I never used one, I know JTAG is a standardized way to program and debug MCUs. But I see a lot of JTAG from various companies. Can I use a particular JTAG to program/debug MCUs from different companies and with diferent archit... |
H: How to affix graphic LCD to PCB?
I'd like to mount a small (2.5") graphic LCD or OLED display on a PCB. I believe it should look something like this:
I've seen this done (links to pics) on my LM3S6965 development kit, on my TI Evalbot, and on this Sparkfun breakout board. All of those images show a pane of glass... |
H: Is this a good way to power my camera?
I have a Canon SX210 IS which has not a connector to use a external power supply. So I wanted to connect "my" power source to the pins the battery usually touches.
In the back of my camera, it says 4.2 V but the battery has 3.7 (model NB-L5).
Right now, I have in my hands a vo... |
H: Deciphering Mux/Demux/Switch Nomenclature: AxB:C?
I'm looking through Digikey's Interface - Switches, Multiplexers, Demultiplexers section (and, thanks to W5VO, the Logic - Signal Switches, Multiplexers, Decoders section as well), and I'm having trouble deciphering what circuit/topology I need.
I've got a process... |
H: Why can't a multimeter measure its own current and voltage?
Well I finally obtained another multimeter, so now I have a Mastech MS8226T and a Ben Electronic M92A. I decided to measure at which voltages would the low battery warning appear and how much current each of them consumes.
So here's my setup: Power supply... |
H: Do I have a ground loop or another problem?
Okay, I know this is an electronics Q&A site, and this question is mildly computer related. But I've got this problem with my VGA monitor, a graphics card and a computer. The problem is the video output is blurred in one direction quite badly. This looks very similar to a... |
H: Image processing on PAL/NTSC
I want to process a PAL or NTSC video signal and pick up colors, like green, orange, blue and red. Is there any way to decode RGB from NTSC/PAL easily, and then detect these colours? I'm looking for a small and cheap solution. The end goal is to build up an array of pixels matching a co... |
H: Calculating the amount of torque needed to turn shutter
I'm working to design a motor to control a mechanical shutter. After considering some other possibilities I have decided to try using a stepper-type micro motor. We're using a shutter from Edmond optical. I'd like to pair it with one of the Micromo stepper mot... |
H: System Generator: How to configure the CORDIC divider block. Understanding the block parameters
I have some dudes about the block parameters of the CORDIC DIVIDER.
I would like to someone explain me the parameter called "Latency for each processing element".
(See the parameters inside the red rectangle)
I don't und... |
H: Chassis / case for electronics projects
I'm looking for some chassis and cases to put my electronics projects in. My projects tend to involve at least one microcontroller and/or fpga. My boards are often very "verbose" and I put few major features on each board so I often end up with several boards. I would like an... |
H: Looking for a open-source ALU
I am looking for a open ALU to compute several equations like these:
y1 = e^((constant1 - x)^2/(2*x))
y2 = constant2/y1
y3 = y2*constant3 + x*constant4
Where x is the input of my system and y3 is the output.
I would prefer that the ALU supported floating-point operations. Where can... |
H: AGND/AVDD on a chip
I am considering using a chip, but the datasheet is confusing me as it has several distinct power pins.
It has:
PLL_VDD
PLL_GND
AVDD
AGND
DVDD
DGND
DVDD_IO
DGND_IO
This is the chip.
How do I hook up each? Do I connect AVDD straight to DVDD, and what about PLL_VDD, and the ground pins? The sug... |
H: Timing differences with a 27 MHz data clock
I'm considering using a chip which outputs 8-bit data on a 27 MHz clock. The data will go from the chip to a FPGA, a distance of a few cm max. Do I need to be concerned about timing differences between traces on a PCB, and if so, how can I mitigate these? I've often seen ... |
H: What're the benefits of checking electronics in person over the exclusive online stores?
I found a few specialized electronic parts that I am interested in buying from eBay and/or Alibaba. However, knowing that I will be traveling to China soon, I felt checking the purchase in person would lower my risks of getting... |
H: System Generator: How to generate a .bit file?
I am using System Generator and I would like to generate a .bit file in order to load into my FPGA. Does anyone know how to generate a .bit file with SG?
Thank you.
AI: Well, I found the how-to.
Just click on the System Generator token block on the simulink scheme and ... |
H: What's the best cable to transfer audio signal?
Sorry if this is the wrong place but I'm interested in a scientific and electrical explanation and not some HiFi voodoo magic.
I guess you all have seen the discussions about expensive audio cables and "improved" sound quality.
My question is, what's the best cable fo... |
H: Build ATMEGA16 Board
First of all, I'm a newbie regarding electronics&robotics so please bear with me.
I have been working as a programmer for a few years but I just got interested in playing with microcontrollers.
Can anyone recommend a book/tutorial for building a development board based on ATMEGA16-16PI
.
As of... |
H: Using motors with arduino without external hardware
I have three small motors, and I know you should use a motor shield or driver when working with the arduino, but would it be safe to use these with the arduino by themselves without a shield? And if so, what would be the best way to work with them and control thei... |
H: Multi node bus options
I want a master node consisting of a TI Stellaris Cortex M3 core connected to what can be up to 32 slave nodes of TI MSP430 (or possibly more Stellaris slave nodes). These will be maximally 0.5 meters between master to most distant slave. Bit rates of around 0.5-1mbps will be needed. What kin... |
H: What cable do I need to connect rows of male header pins together
I have a Jaguar motor controller that has a set of 5 inset male header pins to connect an encoder. The encoder has only loose wires coming out.
What type of connector should I be buying to solder/crimp onto the end of these?
Also, there're a couple o... |
H: Power Supply Rejection Ratio for Battery Powered Systems
Analog Devices just brought out several LDO regulators claiming double the power supply rejection ratio of competing devices, and targeting these devices at battery powered devices.
However, I thought that batteries were quite noiseless, as opposed to poweri... |
H: Extra negative battery cable when charging outside car?
If you go to: http://www.battery-chargers.com/charging_instructions.htm
...Under "Operating Instructions" part "B: Charging battery outside of vehicle", it says you have to attach an extra jumper cable to the negative battery post, that is then clamped to the ... |
H: Difference between BGA and LGA
I have come across a chip which is only available in LGA. I wouldn't touch BGA, but what about LGA? How possible is it to design for one with little experience? Are there any gotchas? I'm planning to reflow solder these using a hot plate.
AI: LGA is similar to BGA, but without the sol... |
H: How to get TinyCAD to output correct netlist when using hierarchical design?
I've got a design (PIC microcontroller that uses transistors to turn on banks of LEDs). I have 2 instances of the LED array, so I made a hierarchical design - I have a separate schematic for the LED array, and I put 2 instances of it into ... |
H: Roland Microcube modification, need a hand
My Roland cube has stopped working, the guitar input connector for the main channel has been faulty for a while but now its gone completely. I opened it up and it looks like the connector is badly damaged.
I want to take the connector from the clean/line in channel at the ... |
H: IR-near visible light detection
I want to detect light near 10 micrometer wavelength. It seems like photodiodes are mainly targeted for 1 micrometer range. Is there any detector/sensor for 10 micrometer wavelength ?
AI: Certainly there are microbolometers for this spectral range. They are called PIR sensor and are ... |
H: USB ESD protection
I am using a microcontroller (PIC32) with a USB interface. The USB interface will be often exposed to human body ESD discharges. Should I protect against these, and if so, how?
AI: USB pins need protection from ESD. Here is one solution using TVS devices. |
H: ADC input circuitry and source impedance
I'm using a maxim ADC in my application from this family: http://datasheets.maxim-ic.com/en/ds/MAX1304-MAX1314.pdf
The devices have relatively low input impedance. If you look at Figure 5 in the above datasheet, on page 19, you can see the equivalent input circuit. My ADC is... |
H: How do constant current power supplies work?
How do constant current power supplies work? For example I have a power supply that is constant voltage that can supply up to 5A and I have a 12V motor that takes ~500mA so I crank up the supply to 12v and my motor pulls ~500mA from the supply. But how does this work for... |
H: what is an average CPH speed for hand SMD assembly?
What would be the average speed (an experienced) person would assemble surface mount components on to a PCB? Assuming they have desk that is correctly set up (pick and place station) and the PCB has solder paste already applied.
Reason for the question:
Pick and ... |
H: reading raw data from a cdrom
Can you point me some technical resources on how cdrom works and is it possible or lets say how easy to make a diy cdrom ? I am interested in reading and processing raw data from cd, not using a chip to decode EFM etc.
AI: Maybe you will get direct links in other answers. I'd suggest g... |
H: T-trigger: minimum transistor count
I am playing around with real implementation of basic logic schemes from transistors.
Could you suggest any compact implementations of T-trigger? Obviously, classic "CMOS" way eats way too many.
Other nonlinear elements are allowed (like tunnel diodes), diodes and other component... |
H: What kind of spade connector is this?
I need to replace a plug on a mains powered device. It uses a specialised connector (to make it difficult for hobbyists, I guess) so I want to replace it with a standard mains plug. Unfortunately the cable connects to the PCB using some kind of spade/Faston connector, but the... |
H: Is there a text or markup standard for describing a Bill of Materials?
I'm an electronics newbie, and recently purchased empty PCBs for GoodFET and Ubertooth.
While trying to put together an order for all the parts in the bill of materials, I realized I'd very much like to have a computer parseable format I could d... |
H: How should I route SPI lines?
In my schematic, I have 4 SPI devices to hook together. I am going to operate the SPI up to 8MHz. Should I be concerned with installing damping resistors? source termination resistors? Should I route them in a star formation, or in a serial fashion? Does adding lots of vias hurt the si... |
H: What makes a particular platform suitable or unsuitable for production use?
Let's assume that the cost of goods is an insignificant factor. If a company lacks a team to produce a custom board for a particular product, but has success with an off-the shelf development platform like Arduino / Netduino / mbed, what s... |
H: What is the purpose of an IO shield on a computer case?
What purpose does the IO shield on computers serve? I have been reading a lot of articles (mostly forums) on the internet and can't seem to find a definitive answer.
AI: I/O shield:
1) Shield to keep electro-magnetic radiation inside of the case
2) Dust Co... |
H: Is there a way to protect RS-232 Transceiver IC from static death
My company sells devices many devices that use RS-232 line transceivers like the MAX232 chip. In many cases our users run their RS-232 cables in the range of 30 to 50 feet to connect our device to their PC. Over the years we have seen many boards com... |
H: If mobile phones have to go through such extensive FCC/CE/EMI testing, why do they interfere with my radio?
It seems that to sell a GSM mobile phone, companies like Apple, Motorola, Sony Ericsson and many others invest a considerable amount of money in EMI testing them. Yet they still interfere with my stereo, radi... |
H: Would pictured circuit be good enough to power ATmega162?
I've read the datasheet and the application notes elated to AVR Hardware Design Considerations and EMI. From them and various Internet sources I came up with pictured design for power supply circuit for ATmega162. AVR would be connected after C3. Right now, ... |
H: What wire do I need to carry 30 A for 18"?
I have an 11.1v lithium polymer battery pack which has 1300 mAh capacity and has a 20 C rating. Therefore I figure the maximum amperage the battery can supply is 26 A. (C * mAh / 10001) To be safe, I figure the wiring I use with it should be able to handle 30 A in case a h... |
H: How to connect decoupling capacitor when VCC/GND pins aren't close
I'm making a board which will host an ATmega 162 microcontroller in PDIP package. Unfortunately, VCC and GND pins are diagonally arranged. From what I've read, the capacitors should be as close to the pins as possible for maximum effect.
Right now... |
H: Seeking cheap RFID reader / writer
What I do not want is one of those RFID readers which attaches to serial or USB port and writes its input to stdin.
I am looking for cheap & nasty RFID reader which I can query over serial or USB; a bonus is if it is also an RFID writer but doesn't add too much cost.
Coding someth... |
H: FOSS ModBus libraries/VCl?
I'm looking for FOSS (for commercial use) VCL components for Delphi or libraries for Visual Basic/C/C++/C# ... basically, just something to abstract the h/w for development, although a h/w simulator might be useful for testing.
Does anyone know what is available?
AI: Take a look at MODBUS... |
H: Are discrete MOSFETs ESD sensitive?
CMOS inputs on microcontrollers and other ICs can be damaged by ESD discharges. Can the gate of a big discrete MOSFET (2N7000, IRF9530, etc.) be damaged by ESD discharges?
AI: Yes. I've used MOSFETs which had a conductive rubber band around the pins to protect the gate(s) by shor... |
H: Heating an object with a circuit
I would like to make a circuit that can heat up an object to a very high temperature, similar to an electric griddle or coffee cup warmer. What kind of heating elements do they typically use and where can I buy them? They should be pretty easy to power with 120VAC right? I just need... |
H: IC Design Resources
Looking for some resources on the design of Integrated Circuit Designs as they can contain a range of components. I am interested in how they can produce diodes and resistors on the dies in the ICs. Are there any free resources available?
AI: If you're looking for a free IC design book available... |
H: FPGA board for implementing wireless video
I want to build a FPGA based prototype for uncompressed video over wireless connection with one box being transmitter and other a receiver (to display). The transceiver speed for HD video (1080) is 3-4Gbps. But it would need an expensive FPGA board. I am thinking of VGA ... |
H: Very low stacking height PCB connector
I need to stack two PCBs together, but the stacking height is extremely critical. In terms of board-to-board connectors, the best I could come up with was SAMTEC GFZ series.
What other solutions can be recommended to stack two different PCBs? I need to have very low stacking h... |
H: Very low frequency (<1Hz) high pass filter design
I want to design a very low frequency (<1Hz) high pass filter. I was thinking of using a 2 pole sallen-key opamp design with a pair of r's and c's. Is there anything special I need to consider when choosing component values/types. It looks as though the caps will... |
H: What's the best tool to design casings/boxes?
I often tend to build a prototype for a project and if I have something that's good enough I find a case that matches the prototype I've built. However, now I'm trying to do more of the design up front and would like to design the casing up front. The latest projects se... |
H: Soldering Tiny Leads?
I've got some really tiny leads on a USB port that I need to solder to a board.
The local Hackerspace has a microscope that I'm going to see about using this for, but even a soldering iron is gigantic compared to these tiny leads. Does anyone have any tips (pun intended and unintended) for s... |
H: I want to be able to measure weight (typical range of human weight), what sensor can I use?
I've seen this force plate from Vernier and it requires another USB interface device. They have an SDK that will they allow us to communicate with the force plate.
Is there something that I can create on my own that also mea... |
H: Importing an asc PADs file into Eagle
I have a .asc PADS file that defines the footprint for a part I am using. Is there any way I can use this file with Eagle so that I don't have to make the package from scratch?
AI: I don't know of any Eagle user scripts for importing files from PADS. I suspect that your best be... |
H: System Generator: How to make an implementation a mathematical function through a ROM
I want to put in a ROM a vector of values I have in the workspace. Does anyone know how to do it?
Thank you to all possible references, articles or comments.
AI: Use a ROM block (from the memory section of the Xilinx blockset).
It... |
H: How to charge Laptop Li-ion Battery cells manualy?
I have received some Li-ion batteries which were originally used in Asus A2 Laptop battery original one and I would like to know if it is possible to charge each cells independently with some device or just normal universal charger.
I Apologize if i asked in wrong ... |
H: Short circuit protecting a class AB amplifier
I am designing a little class AB amplifier for a small circuit. This circuit is biased such that it has low crossover distortion. Below is a schematic:
As you can see, I have inserted 68 ohm resistors in series with the power supply lines. This is such that when the o... |
H: Measuring temperature of microcontroller and other large ICs
I'm going to be using a microcontroller and SDRAM IC in an enclosure that could, given some environmental variables that I have no control or knowledge of, get too hot for the devices to work properly. Redesigning the enclosure is not an option. However... |
H: Visual logic designer + simulation
in university we had our internal program called HLCCAD - it was very nice, and now I need to do design & debug some digital circuit and wondering what is current state of art software for that kind of things (price is out of consideration for now)?
I.e. I want to visually place ... |
H: Is it safe to keep on using AC adapter with a damaged output capacitor?
I was experimenting with my universal laptop adapter (Meind 100W) and when I switched it to 34V mode (while official max is 24V) the capacitor (25V) popped (the top opened and some white fibers spread over the nearby parts).
The capacitor is gl... |
H: Calculating weights in a particle filter experiment using multiple state variables
I am trying to implement a particle filter for coupling gyro and electronic compass for better measuring device orientation. [related question]
I understand my state vector would contain the absolute angle and turn-rate and my observ... |
H: Why is a capacitor placed in parallel with oscillator output?
I have a circuit board with an oscillator and I'm curious about why there is a capacitor hooked up to the output. The oscillator is a SWO series HCMOS Square Wave output crystal oscillator. The schematic of the oscillator connections is as follows.
... |
H: Darlington Array IC that can sink 1.5A
I am looking for a darlington array IC like the ULN2803a that can sink up to 1.5A. It needs to be in a DIP. Any recommendations? Its needed because i am driving a stepper motor and requires 1.2A per coil. I am controlling the stepper motor from a PIC. So if you have another so... |
H: Power and ground configuration in a schematic
I have a schematic for a commerical circuit board, and I was curious about the following:
1.2V
|
------------------------------------------
| | | | | | |
=10uF =1uF =.1uF =.1uF =.1uF =.1uF =.01uF
| | ... |
H: Need bin or hex file for Pic 16F648A Serial LCD
I have seen some kits and boards for a Serial LCD based on the PIC16F648A.
A have a few of the chips and a few LCDs. I'm not into PIC programming, does anyone have a link to the compiled software I can program my PIC chips with to make my own serial LCD?
AI: Compiled ... |
H: Is it possible to repair a PCB which has suffered a DRC failure?
Okay, so I was a bit of an idiot while designing my PCB. The specifications of my PCB fab were 6/6 mil trace/space, and the boards did not meet this. So, below is the design for the PCB:
The trace going to C16 (a ground) is way too close to the pad w... |
H: Which potentiometer to chose for LCD screen contrast?
I recently obtained DEM 16217 SYH-PY 2x16 character screen. Here's the datasheet. As far as I can see, its contrast pin should be connected to voltage source over a potentiometer. How do I pick correct resistance of the potentiometer for this use?
AI: I don't th... |
H: Difference between E/SP and I/SP and other variants
First post in Electronics and Robotics... I've been trying to order a DIP PIC off of Microchip (first time going directly off the website) for use with the RFM12, but I dont really know what all the variants are.
I'd like to get http://www.microchipdirect.com/Pro... |
H: Dual slope converter vs. delta-sigma converter?
I'm curious as to why dual-slope analog to digital converters are used in most digital voltmeters, like one of these when a delta-sigma converter like one of these easily exceeds the specifications of any of the other dual-slope converters sold by Microchip, and in fa... |
H: Weird Thermal Reliefs in Eagle PCB
The thermal reliefs of my ground polygon to one of the pads of my footprint are just simply weird! I dont know what causes it? It seems to me that the lines leading up from the polygon to the pads are just too thick and are out of proportion to the pad.
AI: You need to change the ... |
H: Are MOSFETs Sensitive to heat while soldering?
I'm soldering through the hole MOSFETs in to a PCB and I don't have a temperature controlled soldering iron. So will I need to heat sink the legs as I solder them to stop internal damage. I as this as bipolar transistors are damaged from heat.
AI: The difference in the... |
H: Relay vs. Transistor?
Rather basic, I'm afraid, but when would you use a relay, and when would you use a transistor? In a relay the contacts wear out, so why are relays used at all?
AI: Relays are on-off devices. Transistors can have their voltage drop varied.
Relays are far slower than transistors; typically 50ms... |
H: If I'm amplifying a triangle or square wave, does the GBWP of my op-amp need to be higher?
I want to amplify a 4 MHz triangle or square wave by 2 using an op-amp. Do I need an ~8 MHz op amp, or a much higher rated (and more expensive) device to handle the harmonics?
AI: Short Answer- Yes. Minimum 3x the fundamenta... |
H: Powering laptop from 12V sources without inverter
This question has two parts:
1) How inefficient is it to boost 12V to 120V and then back to 12V as in using a traditional car power inverter to power a laptop (i.e. the 12V car battery power is boosted to 120V by a power inverter and then back to 12V by the laptop's... |
H: What's a good spectrum analyzer to learn with?
I'm trying to learn more about building RF circuits and I want to buy a spectrum analyzer. I've looked around on ebay, and a lot of them are really expensive. I'm a student, so I don't have a lot of money to spend on it. What's a good model to buy since I'm just starti... |
H: Getting started with robotics
My brother is a senior in High School. When he visited our college. I've took him to a robotics event (inter college robotics competition). He got to see various bots designed by college students and got mesmerised. Now he too wants to design bots like that.
I told him programming is n... |
H: Motor drivers and kickback diodes
I am considering buying one of the hbridge drivers referenced in the below tutorial, but when I looked at the comments underneath the second hbridges sparkfun page, kickback diodes were referenced and how one of the drivers has internal diodes but the other doesn't. I will be worki... |
H: When a battery is your power source, what is ground?
For the sake of not incorrectly connecting my power supply and damaging my board I'm going to ask a relatively dumb question. Is ground on my board the negative terminal on my battery? Explicitly should I connect the ground to the negative terminal of the battery... |
H: Power brick with a high pitched whine
The powerbrick for my computer emits a high pitched whine. What could be causing the noise? Any way I can stop or reduce it?
AI: Switching power supplies use an inductor which can emit high-frequency noise. You can't do much about it, apart from replacing it. You could try disa... |
H: Can I burn out my multimeter's µA range by using a few mA of current?
My multimeter only has one 400mA fuse protecting the µA and mA range (and a 10A fuse protecting the amp range.) Is it possible to damage the microamp range by feeding milliamps through it?
AI: Multimeters use a precision shunt resistor to measure... |
H: I've done breadboards and programming, where is a good place to move on?
I have a decent (equivalent of introductory college level) with circuit design, all on breadboards, as well as programming on a variety of microprocessors and a couple FPGAs. I'm just wondering where would be a good place to go on from here in... |
H: Error output for daisy chain flip flops
I am working to create a daisy chain Flip Flop circuit (following the asynchronous method of connection).
The Q output of a flip flop acts as the clock for the next Flip Flop.
module dff(d,clk,q,qbar,rst);
input d,clk, rst;
output reg q, qbar;
always@(posedge clk)
if(rst) beg... |
H: How does a diode-connected MOS device 'clamp' the voltage
Hi,
I'm having some trouble understanding how the diode-connected device M3 maintains a fixed voltage difference between VDD (source) and node X (drain)? In other words, why is it called a diode?
I know that diode-connected devices are always in saturation ... |
H: How to check whether an IC has gone bad or not?
My Question
I have unfortunately, had an incident with my the 74LS08 (And Gate) IC. When I accidentally powered it incorrectly, the IC started to heat, very quickly. I was powering it using an adapter from a wall socket (5V of input power).
I cannot remember exactly t... |
H: How do modern CPUs treat memory operations?
How does a modern CPU treat memory reads and writes on the hardware level?
With old 8-bit architectures all memory locations are read and written to one byte at a time, but how do modern CPUs that have much wider data buses treat 8-bit memory?
What would a modern CPU like... |
H: W5500 2-layer PCB or 4 layers?
I am in process of hiring a freelancer to develop a PCB which will incorporate Wiznet W5500 ethernet IC.
Some have suggested a 4 layer PCB, but some are saying it is possible in 2 layers.
As the board has many buffer IC's and other connectors which don't require 4 layers.
I am skeptic... |
H: Troubleshooting I2C issues of ESP32-POE-ISO with LAN
i'm trying to read a I2C HTU21D from this breakout (schematics below) temperature and humidity sensor and send data to an mqtt broker.
I'm using PCA9306 in order to use 5V and go "far" (30m) from the main MCU PCB using CAT5E cable and RJ45 connectors.
The MCU ci... |
H: 3-to-2 line encoder (or generally 2^(n-1)-to-n) -- not priority, but telling how many inputs are on?
This is not homework (not taking any classes) although it could be homework. I am wondering what is the easiest implementation using a single TTL chip or gates (fewest chip count) to encode the number of input lines... |
H: High voltage PSU resistors
I've looked at a dead power supply and see transistors, ICs, an optocoupler, etc and have come across what the board says are resistors[ R<#>]. Resistors that I've come across are the typical 3/4/5 band DC ones. I'm guessing these are high voltage resistors though I don't know the real ... |
H: How to strongly fix N-type connector to thick RG cable?
Can someone tell me what kind of solder or conductive hardening paste is used here to fix the inner conductor of the cable to the pin. I tried soldering of the pin to such cables with tin, but this does not stay fixed when applying stronger tension to the RG c... |
H: Making a circuit entirely with 4:1 MUX, 2-input OR gate and NOT gate
I'm stuck on this question for half of a day. Let's say I have this function
That's everything I know about it. Now I must implement it using only 4:1 MUX, 2-input OR gate and NOT gate. I've tried to look at the truth table and create a circuit, ... |
H: How can I generate overflow condition from a 74'283 or 74'181 adder without an output pin of the carry-in of the MSB?
I've been building my own CPU from low level chips, using the 74LS283 adder. And I've been wondering about how to set the overflow flag. Finally I seem to have grasped that the overflow flag is the ... |
H: Can you program an attiny 85 after is soldered to a board?
I'm developing a project that involves an attiny85 that is already soldered and with several components and sensors connected to it (on the PCB)
Can I program the attiny85, with the other components connected to it? Or should I preprogram it before solderin... |
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