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H: What quantity changes when the signal is amplified without changing SNR in this case?
This is a conceptial question and I want o ask via an example in my mind. So I neglect any other factors which are possible for the sake of simplification. Let’s assume an analog signal through a channel can handle 1V variation an... |
H: Powering ETH Controllers
I began working with Ethernet controllers and there is a recurring theme that keeps confusing me.
Currently I am incorporating the KSZ9031RNX into my design. The data sheet calls for digital and analog voltage supplies. My first thought is that I will need to incorporate a DAC in my PM cir... |
H: VCO SN74LS624 - understanding pin out / how to read datasheet?
I have a SN74LS624 chip and I am trying to get it working on a simple breadboard with an oscilloscope.
I have read the datasheet here: http://www.ti.com/lit/ds/symlink/sn54ls629.pdf
I can not understand a few things from the data sheet:
1) The intro par... |
H: quartz crystal - figure of merit
What represents this formula in terms of an RLC series circuit that forms a resonator? It is called figure of merit and it is defined like this:
M = 1/ w*C1*R1
where w = 2*pi*f
AI: Your equation for figure of merit M, AKA the Q of the circuit, is correct as long as you recognize th... |
H: Opto-isolator to read 30V with ESP8266 3V3 input
I've an old board with an output of 30-31V or 0. I need to read these high and low values with an ESP8266 that works at 3V3.
Do you think I can use a PC817 opto-isolator or something similar?
Can you point me to some schematics?
AI: To use an opto-isolator you can u... |
H: Capacitor Numbers, What do these markings mean?
I have this capacitors and I tried learning how to read them but I am still unsure. I believe these are 330uf 16v capacitors but I dont know what the 282 means. Or if I am even correct.
What do these markings mean?
AI: I would agree its a 330uF 16V capacitor.
The 282 ... |
H: Power-supply made of battery+solar cell, ultra low power
In various scientific calculators, we can see that they have "twin" power, basically a mixture of a solar cell and a battery. I would like someone to tell me what kind of circuit usually takes both power sources to power efficiently a small low power MCU for ... |
H: Best way to connect 5V to GND from ESP (3.3V) - transistor or optocoupler?
First of all: I read through some of the suggested topics (i.e. connecting a 5V relay to an ESP), but to my (limited) understanding, this seems not to be the problem I'm trying to solve. If it is, please accept my apologies.
What I'm trying ... |
H: Brushed motor with shorted contacts can still rotate
From what I read here and on the internet I understood that shorting or adding a big load to the contacts of a DC motor will make it very hard to turn as a generator.
I have a 500W brushed DC motor that is considerably hard to turn by hand as is. Upon shorting ... |
H: Power consumption problem in high-voltage power audio amplifier
I have a problem with my power audio amplifier.
I am unfortunately forced (because of the specifications I have been given) to make it work at a dual voltage of +-90V.
Finding the components to do it was not difficult, I built it, I balanced the curren... |
H: How to decide CPOL and CPHA values in SPI configuration
I am working on a slave device for which I have to write a Master configuration.
In the datasheet of the slave, it is mentioned, "The SDO data changes on the falling edge of the SCLK signals. The devices sample the SDI data on the rising edge of SCLK"
Can you ... |
H: Power supply circuit for a PIC16F88 Microchip
I'm coming from the world of software, where I feel quite at home - I spend a lot of time writing code. I do not feel at home in the world of electronics and designing circuits. I really REALLY would like to learn more about electronics and designing circuits. I know I ... |
H: Can long-range radio waves from an RTV tower penetrate thin plastic composite material next to its source?
We are currently developing a conceptual design for the renovation of Croatia's main RTV tower located on 1033 meter tall peak Sljeme at the Medvednica mountain north of Zagreb. The idea is to renovate and reo... |
H: Why does unaligned memory read require extra clock cycles?
I believe I understand how memory reads work with the 8086 processor.
The 8086 has a 20-bit address bus and 16-bit data bus (multiplexed).
The memory module consists of two memory banks, and the LSB of the address bus is used to select which bank to access ... |
H: Is an op amp voltage follower better than one made with discrete (MOS)FETs?
Is there any advantage of the following op amp based voltage follower:-
over one made with discrete MOSFET components such as:-
other than component count?
AI: Yes opamps are better. the opamp is two components: the opamp and the bypass c... |
H: Why does 50 Ω termination result in less noise than 1 MΩ termination on the scope reading?
Regarding the following section from the Keysight document "Making Your Best Power Integrity Measurements":
It says that using 50 Ω termination we will see less noise on the scope compared to 1 MΩ.
Can this be explained by m... |
H: Why do fuses burn at a specific current?
We usually specify the maximum current that a conductor (such as a fuse) can handle without burning. But doesn't the conductor really fail when a certain amount of energy/heat has been dissipated in the conductor? Then the conductor is at a too high temperature and burns/mel... |
H: FPGA input capacitance
I want to estimate power consumption of a battery powered digital circuit that has a CPLD (Lattice LCMXO2-256HC). It receives 64 MHz signal into LVDS input and 10 MHz, 2.5V into a schmitt trigger input. Its output is ~50 kHz so I'm not concerned about the output capacitance. So the question i... |
H: Circuit exercise with diodes
So , I found this exercise online :
I am having having a hard time finding the conducting values of the diodes . Will D1 conduct for Vin>=10 and D2 for Vin<=-10? And what will be the value of Vout when both of the diodes don't conduct? (Assume that both of the diodes are ideal ,V2=Vin ... |
H: Help finding voltage between two points
So, how should I proceed to find U_ab (or V_ab)?
I have found I = -0.5mA, U_1=-2.5V, U_2 = -0.5V, U_3 = 2.0V.
How would I even find U_a and U_b separately so I can apply U_ab = U_a - U_b?
Also, does the 10v source receive or deliver power?
AI: Start at point b and walk to p... |
H: Is it misleading to say "holes in semiconductors jump to the other side"?
I'm getting a little confused with the convention of saying that "holes in a semiconductor will move from p-side to n-side and electrons will move the opposite way". I have no trouble with the concept itself, it just seems to me that an elect... |
H: Modification to Arduino 12V Detection Circuit
I'm upgrading the interior lights on an older model vehicle. The plan is to tap into the very simple lighting circuit (always hot with a switch for on-off-door) to detect each scenario. Light switch on, stock lights come on = Arduino does something; Light switch in door... |
H: Weird component in load cell Wheatstone bridge
While trying to repair a cheap digital kitchen scale, I came across this component (see picture below). AFAICT, this is 95% identical to the standard Wheatstone bridge interconnect for combining 4 individual load cells with 3 leads each; the red wires directly lead to ... |
H: How to read this capacitor
https://i.stack.imgur.com/mjF4e.jpg
This is in a 2004 manufactured motherboard, Sanyo brand capacitor
Can anyone help me identify the mf rating and volt. And why it’s written like this
AI: Top right corner, 620uF 6.3V,
Left, 750uF 4V
As to why I read it that way, there are a few hints, f... |
H: Data Bus and High Impedance
Let's consider an interface between a simple microprocessor and a certain memory. For instance, let's assume that the microprocessor drives the address bus, a read signal, a write signal, and that the data bus is a bidirectional signal, which can be driven by the processor or by the memo... |
H: How to correctly set logical high level on a PS/2 port?
I'm trying to make a keyboard emulator on ATmega16A. I'm currently implementing logical low as output-zero, and, since the host(?) is supposed to pull up the line, I send logical high state as input mode of my pins. This lets me easily check that inhibit condi... |
H: D Flip-Flops at MCU IOs
I found below PCB from a machine. It has a MCU for control all inputs and outputs and MCU inputs and outputs go through HCT374 IC to optocouplers that isolate all inputs and outputs.
What is the application of this D Flip-Flops?
AI: The fact that there's a multi-flipflop IC in the path betwe... |
H: Is this an active or a passive circuit?
Is this an active or a passive circuit?
AI: The two 5V sources cancel, lets say you feed in 1V, the right 2 Ohm resistor ends up only seeing a difference of 1V, same if you feed a current in at "I", the offsets do not prevent the current from flowing through this right resis... |
H: Polarity of gas discharge tubes
Do gas discharge tubes used e.g. for surge protection have a polarity, i.e., do they protect in both directions (i.e., depending which wire is hit, or if it is a positive/negative lightnings?
The symbol (see below, from Wikipedia) has a dot that suggests some asymmetry. Electrons sho... |
H: what is this type pulses called?
I was wondering what is this type of pulses is call. Is it a sin wave? I know its the result of sinusoidal pulse modulation. is it considerd a quasi-sin wave?
I would like to know the name to research it more.
AI: I think this pattern is called "wave packet".
https://en.wikipedia.or... |
H: Are there any modern tradeoffs that come with designing more efficient DC-DC switching power converters?
Are there common metrics that usually degrade (ex. ramp time, line/load regulation, low-load efficiency) when pursuing more efficient designs, especially for isolated converters?
If you saw a new isolated high-... |
H: Photodiodes: the "generation" mechanism behind photocurrent
Assume I use a photodiode under zero-bias (that is in photovoltaic mode). How/why can a current flow in this bias condition?
As far as I have understood the working principle of photodiodes, when photons hit the depletion region of the P/N junction, the en... |
H: Ramp compensation for UC1843 and UCC38C44
When we pick up the datasheets of UC1843B-SP and UCC38C44, we notice that they have the same functional block diagram, specially the PWM generator circuit (Error amplifier, current sensing PIN and the comparotor), the error amplifier of both devices goes through a divider b... |
H: different threshold value of 2 inverters
What is the meaning of having 2 series inverters, one with the switching threshold at 1.025 V and the other with the threshold at 0.3V?
What does this difference between the switching levels mean?
The circuit has a sine wave at the input of the inverters and it makes a cloc... |
H: Single Supply Class-A-Amplifier circuit to amplify voltage signal alternating around ground
I have a sensor which outputs a voltage signal alternating a few millivolts around zero volts and want to design a circuit which prepares this signal for processing by a microcontroller like in the picture below:
Now the pr... |
H: Can a 74AHCT IC be a drop-in replacement for 74HCT IC
I have a circuit in which I interface a radio module running on 3.3V indirectly from a 5V supply.
I use a regulator to provide the 3.3V module VCC and the data is exchanged between both circuits through double-inverters (74HCT04).
This setup does work, but I re... |
H: Why does the measured current differ from the calculated current in this circuit?
I have the following schematic:
Now I want to know the (more or less) exact current flow in my circuit. For this I did the following calculations:
I = V / R
I = 5V / 330 Ohm
I = 0.015A = 15mA
So with what I now know I expect approxim... |
H: How does electrocution (fatal) happen?
I'm trying to make my workshop safer but I can't understand how electrocution happens.
For example, one hand is touching to live wire and neutral wire is not touched. If I know right, current flows from live wire to my body and to ground wire or earth but dry human hand's resi... |
H: LED lights on 1.2 V battery
Hello.
I hope this is not too novice question. IKEA got stuck with piles of garden solar lighting (their product no 21777) which they sold for 1€ each.
Looking at the back (large solar panel, 2000 mAh NiMH battery, switch etc.) I took seven home (I wish I had taken 20...). I Took one ... |
H: Why would a Intel 8080 chip be destroyed if +12 V is connected before −5 V?
The Intel 8080 is a classic microprocessor released in 1974, fabricated using an enhancement-mode NMOS process, and shows various unique characteristics related to this process, such as the requirement of a two-phase clock, and three power ... |
H: How safety capacitor replaces optocoupler
I see some phone chargers using safety capacitor (after some research I found its safety capacitor)But not optocoupler to isolate in and out . How safety capacitors replace the optocoupler
AI: It generally does not replace the function of an optocoupler, it's to control EMI... |
H: Power Supply Earth for Bench Testing
I work in a typical electronics lab, with resistive earth mats, ESD straps and isolated DC power supplies to test prototype PCBs. I prefer not to use the power supply earth-ground, and to leave the test setup "floating".
Mobile phones and laptops do it just fine, so why can't my... |
H: How are OTP fuses in ICs implemented?
One-time programmable (OTP) fuses are common in ICs. How are they typically implemented, on the silicon level? I know that they generally work like larger fuses, i.e. they can be blown but not repaired, but how is this actually accomplished when thousands need to be fit in the ... |
H: LoRa and Manufacturing Technology
Which manufacturing technology do the LoRa (Semtech SX1276) belong to? Is it a CMOS based chip?
AI: Yes, this chip will be based on a CMOS process, it is the only way to make such a chip in an economic way. This chip has a transceiver working up to 1020 MHz which is perfectly possi... |
H: Did I damage my temperature sensor?
The sensor is a DS18B20, I accidentally connected the positive and negative inverted to the sensor and it became very hot then I quickly disconnected the power.
I don't have any other calibrated temperature sensor at hand to check if the temperature reading is correct or not, onl... |
H: Should I get rid of my bias towards active high?
I realise that in all my circuits I consider active-high the "natural" default and active-low a goofy situation that needs to be inverted. I pull down all data and control lines (resets, output enable, input enable, inputs for an ALU or adder...), put inverters all o... |
H: Unkown DIP IC (OP277PA)
I stumbled upon the most uncommon thing. An 8-PIN DIP IC with part number (OP277PA.)
However, the datasheet is nowhere to be found and I've done my research.
Is it possible that it is an OPA277P, or is it its own thing?
Does anybody have a clever way to test if it is a low noise precision op... |
H: Error in Practical Electronics for Inventors?
I’ve been studying this book for digital electronics.
I think that the highlighted values in the operation of the shown AOI gate are not correct and should be 0 instead.
AI: I think you are correct.
From the block diagram of the 74LS54 datasheet, it clearly shows a sing... |
H: Why parallel diodes on the output of a switch-mode?
I am looking at buck-boost converters on the Texas Instruments design tool, and multiple of these topologies have parallel diodes on the output. I cannot see any reason to do this.
Can anyone explain the purpose of paralleling D4 and D2 on the output?
AI: The para... |
H: LM317 to step voltage up
I am sorry for questioning the "law of conservation of energy" first of all.
The expression for the output voltage of the LM317:
Vout=1.25*(1+R2/R1)
contains no any relation to the input voltage. It doesn't care what's the input voltage. It only cares about the two resistors R1 and R2 (in ... |
H: "Increase" of a register in VHDL and hardware synthesis
Suppose you have already defined a register (for instance called "reg") in VHDL, for instance as a vectors of 4 bit.
Now consider the operation: reg <= reg + 0001; it is like reg ++ in C.
My questions are:
1) how can reg store the result of the sum between reg... |
H: Should I connect the computer VBUS line to the 5V line of the board?
I am doing a project that needs USB communication with my microcontroller.
On the board there is already a 5V power supply. I would like to know if it is correct to connect the VBUS line from the computer with the 5V line that already exists on my... |
H: Measuring the external memory power consumption in FPGAs?
I am trying to get a power/energy breakdown of DDR3 and core logic. I used Quartus power analyzer tool to get the power estimates, but I am not sure whether it includes the power consumption of external memory like DDR3, HBM. In general, how do we measure/mo... |
H: Atmega328p ADC - value keeps returning zero when connected
I'm currently try to connect a DS18S20 temperature sensor to the atmega328p. I have wired AVCC and AGRD to the same power rail on my breadboard as normal VCC/GRD and AREF is not connected.
When I try to connect the data pin of the temperature sensor to the ... |
H: How does the quantization error decrease when the input signal is matched to the ADC input?
Assuming a theoretical example imagine that we at first feed a 1V pk-pk noiseless sine to a 10V ADC. And in the second case we feed a 10V pk-pk noiseless sine to that 10V ADC. As far as I understand from other questions, the... |
H: Can I use an h-bridge as a changeover circuit?
I have solar controller which outputs battery voltage when available.
I also have a switching psu as backup.
What I would like to do:
Use an h-bridge, connecting its battery negative terminal to my load and the two motor terminals one to psu negative and the other to ... |
H: How does a computer chip read code, interpret it, and convert it into action?
I understand that binary is effectively functioning as a “virtual representation” of low voltage and high voltage. However, I do not understand how the instruction set to MAKE the voltage high or low is being executed. Within a computer, ... |
H: Question about the common mode
After introducing the two-stages op-amp and frequency compensation for this circuit, during lecture the Professor asked us to find as an exercise a possible polarization of the following circuit:
in which by hypothesis Vdd=1.8V and the input dc common mode is 0.9V.
While solving tog... |
H: What connections do I make to this Through hole DC Power connector
I'd like to have one of these on a PCB I'm designing but I'm not completely sure how it works. Can somebody please explain to me how to connect this power jack to my circuit?
AI: Centre pin is, well, the centre pin. Usually this is the positive supp... |
H: Confusion in understanding control system?
I am learning basics of control systems from following link
http://instrumentationandcontrollers.blogspot.com/2010/11/types-of-control-systems.html
It says that automatic washing machine & traffic signal system are example of open loop system. It does not gives detail why?... |
H: PNP linear regulator problem
I am designing a linear step-down regulator using a PNP pass transistor. The output of the regulator is good at no load.
When I connect my regulator to a battery supply, leave it for 2 seconds and then I connect my load (say a 12 V DC motor or a microcontroller), it works good.
But when... |
H: Identify specs of this filter coil and enable independent use of PSUs fed through it?
Shown in the pictures is a power supply and distribution system from an old Fuji Xerox all-in-one copier/printer/binder/etc.
In the image that shows multiple components you will see the components laid out with red arrows indicati... |
H: UTD2025CL oscilloscope - help with these displays
I have some concerns about a UNI-T UTD2025CL oscilloscope:
Why there is more than 1 sine wave in the screenshots? Is that normal? The screenshots show a TL431 regulator output. The coupling is set to AC, the trigger is set to CH1.
While measuring output of a 50Hz... |
H: What is conductor to conductor to shield capacitance?
I am using 6.5 ft (2 meters) BELDEN 9154 shielded twisted pair cable for a sub 1 MHz application and I wanted to make a model of the cable for some simulations. The datasheet of the cable lists two capacitance as shown below:
How to interpret these capacitance... |
H: Is it possible to use PIC10Fxx internal flash to store data between deep sleep?
I want to store a single bit with rare rewrite. It's possible for STM32 without EEPROM, but how about PIC microcontroller?
And is there examples with configuration and code?
AI: What you need to look for is if the processor can perform ... |
H: Question - Change in brightness
I have a circuit with two identical lamps, one battery and one switch (see image). I'm pretty sure that if the switch is closed the lamp marked A would get brighter (due to the power being able to take a path with less resistance than going over the other lamp).
What I'm wondering ab... |
H: Is it possible to use ESP32, BLE4 or BT 2 and WiFi same time?
I am planning to use ESP32 module to transfer data using wifi (ESP32 web server AP)to remote PC and also the same time I need BLE to communicate with a mobile app and get some data to eps32.
so I will be needing to use both wifi connection and ble same t... |
H: How to interpret this IC diagram?
Taken from Practical Electronics for Inventors is the following diagram:
I’m little confused here. The pinout diagram shows pin 1 with \$\bar E_a\$. The functional diagram also shows a bubble with the corresponding pin with the inner label being \$E_a\$. So does that mean that we ... |
H: Capacitive load - Circuit protection
I have a circuit which drives capacitve loads (they vary from around 800pf to 1600pf) and because of circumanstances like air polution and dust it can come to electrical contact to the surroundings or even short circuits.
The circuit uses a MP104 to drive the load and when somet... |
H: Non-reentrant Functions as Macros for utilities used in both Main and Interrupts
When compiling software with xc8 for a PIC which has functions which are called in both interrupts and in the main function the compiler gives an advisory:
non-reentrant function "foo" appears in multiple call graphs and has been dupli... |
H: STM32 HAL vs LL
I'm exploring the world of STM32 microcontrollers. I must say, so far it's a huge puzzle. I find that there are many documents provided by ST, but none of them really teach me anything. And it's really confusing that there is so much information that points me to tools that seem to be superceeded by... |
H: STM32 UART How to receive 9 bit?
I am trying to understand how I can setup the UART peripheral to receive 9 bit data blocks.
I am using the ST IDE (STM32 cube IDE) and the Nucleo-F103RB board. I can setup the peripheral in 9bit mode using the STM32 Cube. But the HAL function to transmit/receive data still uses an 8... |
H: Is it possible to control a PWM computer fan with a resistor? If yes, how?
I have a video card that is loud while idle, because the fan curve appears to be set rather aggressively. Unfortunately, this can not be changed via software.
The fan is connected with a regular 4-pin PWM header (black, red, yellow, blue). ... |
H: Simple questions about current flow and superposition
So I was doing this exercise to prepare (not homework, school hasn't even started yet), and I think I got the math and the logic right, but there are a few things that I didn't understand, and since my teachers are on vacation I was hoping you could help. Below ... |
H: Current sensing using XADC
AC701 Schematics
Refer page 40 of the schematics. Here for Vccint- the regulator is switching at 250 kHz.
page 34 has the sensing signal conditioning for that the inst. amp used is INA333 which has BW of 150 kHz, the BW decreases to 35 kHz when gain is set to 10.
They also are using anti-... |
H: Eagle UI: updating silkscreen of library component
I just finished a schematic in the free version of Eagle that contains 20+ 0402 resistors and about a hundred 0805 capacitors.
I switched over to the board layout and found that the footprint of all these passives contains the part value, which I don't want as ther... |
H: Eagle UI: separating hundreds of components that are stacked on top of each other
I finished a complicated schematic in the free version of Eagle, switched over to the board editor and was encountered by this:
In case the image doesn't say it all, there are about 100 components all stacked on top of each other wit... |
H: Displaying different numbers in 4-Digit 7-Segment Display using VHDL
I am trying to display 4 different numbers on my display. Currently I am using a dip switch to input the number and displaying the same number in all of the digits. Now i want to change it and not input it from the dip switch. Instead I want to gi... |
H: Convert ringing frequency to phase margin for LDO stability
Based on ROHM document "Simple Test Method for Estimating the Stability of Linear Regulators", it showed that in page 2/4, the phase margin for Fig.5 Phase Margin = 0 deg, Fig.6 Phase Margin = 9.9 deg and so on.
Simple Test Method for Estimating the Stabil... |
H: Help with understanding the Memory Map of MLX90393
(Using a Raspberry Pi 3 Model B+ and python)
I needed some assistance in understanding the memory map of MLX90393
I've attached the memory map here and you could also find it in the datasheet.
I'm a newbie especially for data processing. The information provided in... |
H: How this close loop control systems work?
I have attached photo of a lecture where a slide is showing a close loop control system(theif repulsion system). But i am confused by the electric eye?how it is working?is the robber/theif so mad that he is carrying an IR source in his hand?(normally a theif is expected to ... |
H: To what pins of the relay do I need to connect a device to be able to control that device ? NO or NC? Why?
I am very bad at electrical things, as I don't understand much of electrical engineering.
I was tasked to design a software that will take some inputs, randomize them and give some outputs to some relays. I di... |
H: How do you connect a coax cable to a homemade bi-quad antenna?
I want to build antennas because I think they're pretty cool. Like invisible photons that pass through matter. But I'm struggling with basics and considering removing my tinfoil hat very soon.
Here is the not working antenna I built: https://buildyourow... |
H: Path analysis D-FLIP-FLOP - what is SET?
I have to calculate the clock paths in a circuit and I have a 2 dual positive-edge-triggered D-TYPE FLIP-FLOP with clear and reset called DFF1 and DFF2.
Data sheet: http://www.ti.com/lit/ds/symlink/sn74lvc74a-q1.pdf
what does it mean: the CLR and SET pins of the two flip-fl... |
H: Current transducer - understanding of turns ratio connection
I'm using a LEM LAH 25-NP current sensor and I don't understand the recommended PCB connections in the table from the datasheet. I understand the first one, but what is with the second and third? What are the input and output pins?
So if there is a trace... |
H: Error with Assert statement in Verilog
I have the following assert statement in a for loop, which is within a generate block:
34 assert ((a[j] == 1'b1) || (a[j] == 1'b0))
35 else $error("Input 'a[" + j + "]' is not a digital logic value");
When I try to compile, I get the following error:
Error: file(34): nea... |
H: Create circuit for 12v auto washer pump to 230v mains with push button for art installation
I am creating an interactive art installation in a gallery context using a 12 volts car headlight/windshield washer pump. It basically is a fluid washer pump taken outside of a car into a gallery, activated by the user (or s... |
H: Why does the seven segment display have decimal point at the right?
All the seven segment displays I’ve seen so far have their decimal point to the right of the main digit. Why is this so? A decimal point to the left will be able to represent more possible combinations of numbers.
A single digit display with a deci... |
H: What will happen if I use higher voltage capacitors in an inverter?
We have old textile machines (Riter ring machine) that have an inverter - very large size and it contains 12 capacitors (400 volt, 2200 uF.)
The problem is we have 20 machines and almost every month an inverter explodes and all the capacitors melt.... |
H: PCI card electromechanical specification
I am making an old PCI (5V) form factor card for a product, and am having a hard time finding any sort of reliable drawing showing the official dimensions of the gold fingers, key cutouts, and their relationship to the PCI mounting bracket.
Was there an official PCI specific... |
H: SMB Connector Grounding for S/PDIF Coax
I'm transmitting coax level S/PDIF over an SMB connector, and I'm wondering if the "body" pins (all pins that aren't the center) should be left floating, or if they should be connected to ground.
As I understand it, RCA Coax S/PDIF does expect the ground to be connected, rath... |
H: Analyze op amp circuit
I want to know how to calculate the output of the below op amp. I know this is supposed be an inverting amplifier with offset but I have never seen the connection of the offset to the negative side of op amp.
simulate this circuit – Schematic created using CircuitLab
I have come up with this... |
H: In practical, what really is a memory word in PLC?
I came across some plc code (structured text) being used in an industrial company. When I asked the question, I got a blurry answer. However, what I picked up is that it has something to do with the SCADA and PLC interacting. Although I'm really not sure what exac... |
H: Why is the answer .908 W instead of 9.08?
I tried calculating it on my own and end up questioning why 200k * e^-10 becomes .908 W instead of 9.08 which was what I've calculated
AI: why 200k * e^-10 becomes .908 W instead of 9.08
It does not.
Taking as a base and unevaluated assumption that the equations are accura... |
H: Astable Multivibrator - Kalafuna is burning, not switching
I am having problems with circuit, that I designed.
R1=R2=R3=R4= 680 ohm; C1=C2 = 20nF; R5=R6 = 7,3kohm
Circuit works only when voltage is about 0,5-0,7V and resistors r5/r6 are not connected.
It "should" oscillate at 50Khz.
** R5=R6 Are calculated for hf... |
H: Running an electric motor beyond its ratings
I ordered a 36V 500W brushed DC motor but unfortunately a 24V one came. I'm faced with the dilemma of returning it and waiting for a month before getting a refund, then ordering a new one and waiting about a month again for it to arrive, totaling 3 months of waiting (wit... |
H: Is the following N-FET circuit sufficient to act as a power switch for an IC?
I'm trying to build a circuit which will turn an IC on and off using a MCU signal voltage of 3.3V. This is for a low-power circuit, so every coulomb is critical.
I selected the BSS816NW N-type MOSFET for the job. One can see that Vgs mini... |
H: TM4C123 GPIO_DATA Question
I was watching a tutorial about this MCU (TM4C123 dev board), but I don't understand where they got the memory location address from. All they are doing is switching the built in red LED on the board on and off.
They are setting bit 1 in the GPIODATA register (see attached image of the da... |
H: How can I connect a sensor to two LEDs so that one will work when the sensor's output is HIGH and the other when it's LOW?
(Moved from the Arduino stackexchange)
Let OUT be the sensor's output.
If I connect
LED1 to BAT+ and OUT
LED2 to BAT- and OUT
is this Ok?
Instead of LEDs those could be units that need even ... |
H: Connecting grounds of two LED drivers
I'm using these Mean Well LDD-H DC-DC constant current step-down LED drivers to drive these LEDs.
What I'm seeing is that when the -Vout terminals of the drivers are connected together, both LED strips start being driven in sync (as if the PWM inputs are connected).
If is use a... |
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