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H: 555 NOISE BUTTON/ OP AMP
I have this circuit from the image below that I am designing myself.
part of this circuit is cut so 2 78xx is present.
This circuit is being designed and tested in parts.
This part of the circuit has to work basically by amplifying the signal from the electret microphone, as it will also wo... |
H: Decoupling Capacitors: What happens to the DC on the cap once noise is introduced and it shorts?
simulate this circuit – Schematic created using CircuitLab
I've been using decoupling caps for a while now and I understand their purpose in keeping DC signals clean since capacitors allow high frequency signals throug... |
H: Transformer switch off spike
From Wikipedia:
When a transformer, electromagnet, or other inductive load is switched
off, the inductor increases the voltage across the switch or breaker
and cause extended arcing. When a transformer is switched off on its
primary side, inductive kick produces a voltage spike o... |
H: Why is actual SOC of a battery actually higher than what is displayed
So I read a document today which said that a higher SOC level (around 20%) is displayed as 0% to the user in vehicles, thus reducing the total capacity of the battery.
My question is that why is that done? Why do we limit the depth of discharge? ... |
H: Car battery voltage readings different with no load - normal?
Typical car battery, 12V. While connected to the car, It read 12.38V on my multimeter. Using the absolutely same multimeter, I measured it once I disconnected it from the car - voltage went to 12.56V. This is in the span of 5 minutes. First measure was t... |
H: Number of independent KVL and KCL
I know that the number of KTL and KCL is related to the number of nodes \$N\$. For KCL there are \$N-1\$ equations while for the KTL there are \$L-(N-1)=L-N+1\$ equations. However I didn't understand how calculate \$L\$. Is it the number of elements in the circuit ? Is it the numbe... |
H: How does an LC network enable a shoot through state for an inverter
I was researching about inverters when I came across the Z source inverter. The Z source inverter is unique in a sense that it enables a shoot-through or a short circuit condition by closing any two switches of the same leg. This would not be possi... |
H: AVR: Why doesn't my if statement yield TRUE?
int i=0;
DDRD = 0xff;
PORTC = 0xff;
while (1)
{
if(PINC5 == 1)
{...}
I have been trying to figure out why the comparison of PC5 pin of PORTC with 1 yields False everytime. I have activated the "pull up" resistor for every pins of Port C. But still, when I co... |
H: Why is reading the 3T1C DRAM cell not destructive?
Could anyone help explain how the above 3T1C DRAM cell works? T means transistor and C means capacitor. Why is reading it not destructive?
AI: During a read T1 is off and T3 is on.
Then T2 controls the read line from the charge on the capacitor. Since it’s gate ... |
H: How is the propagation delay of a logic gate affected by the amount of inputs (fan in)?
I was trying to find out what parameters affects propagation delay and how.
When trying to discover if somehow the propagation delay could increase with the increment in the amount of inputs in a gate, I found this paragraph in ... |
H: Simple circuit to power a 4HP 180 V DC motor
Overview
I'm trying to make a cheap simple circuit to power and control the speed of the motor. It's going to drive a pulley and be used as simple woodsaw.
Problems
Running the motor without a resistor makes it lose control going too fast and smelling like burnt even ... |
H: Push button for different actions in every press?
I'm trying to learn some electronics and I have something in mind that I don't know if it is possible to achieve.
I've worked before with micro-controllers (Arduino, etc) and I know I would be able to do this with code, but I would like to know if this is possible w... |
H: Offset Voltage at Op Amp Inverting Terminal
I'm using ADA4350 as a transimpedance amplifier with various gains for feedback paths (30 ohms,3k,300k and 3 mega ohms respectively). When I give a constant current source of about 23mA as input to it, the Inverting terminal of the op amp at the first stage gets an offset... |
H: Current going into the positive pole of a battery while discharging a capacitor
Please bear with me if this is a fundamental question.
Let's suppose we have an RC circuit, charging a capacitor up to the voltage of a battery of 9V. The capacitor is currently at 9V, we switch the 9V battery with a 3.3V one.
Because ... |
H: PMOS unexpectedly passing current with capacitor on drain
I am designing a circuit to get a pulse when a switch opens. When the voltage source V1 is connected, the switch SW1 starts closed. I want Vout to briefly go high when SW1 opens. The circuit I designed looks like this:
simulate this circuit – Schematic crea... |
H: How to calculate the equivalent conductance of a circuit
I have the following circuit and I'm asked to calculate the equivalent conductance at the ends of the circuit.
The textbook gives the following solution: \$G_{eq}=\frac{1-\beta}{R}\$.
My question is: why does the generator have its own resistance?
AI: The ... |
H: switching regulator output filtering
I am designing and building a power supply with TPS54531 switching regulators from TI. I am double LC filtering the output. The 5 volt PH output pin feeds a 9.2uH inductor, then to a 47uF ceramic capacitor then through a 0.47uH inductor and finally to a 15uF ceramic capacitor ... |
H: How to calculate susceptance of an inductor in series with a resistor
Given the following part of a circuit, I have to find the susceptance.
I know that the susceptance is \$B=-\frac{1}{reactance}\$.
I know that the resistor does not have a reactance, however, my textbook's solution is \$ B=-\frac{wL}{R^2+(wL)^2} ... |
H: Deriving the small signal model of this transistor
Given that the current equation for a graphene transistor is given by equation (1) I'm trying to find the small signal model of the transistor.
$$(1)\space \space i_D(V_{GS},V_{DS})=\frac{W}{L}μ(C_{ox}V_{GS}+a)V_{DS}\\
i_G=0$$
Small signal models were always given ... |
H: Trouble starting a Constant Temperature Anemometer
I made a Constant Temperature Anemometer using this and this as reference. However, I'm having trouble in making it work properly. To get the circuit started I need the emitter voltage (Bridge Top) to be negative but can't seem to get it. No papers nor discussions ... |
H: Wired GFCI vs. 40v 5a battery use near spa
My wife has recently taken to running a cord out near our pool to watch TV. She's very careful, but I was thinking of doing what I can to make it safer, since the outlet in question is NOT a GFCI outlet (It's a standard US 110v outlet).
One obvious solution is an inline G... |
H: Desoldering a through hole capacitor with weird terminals
Apologies in advance if this is the wrong place to post this question.
So I've just RGB modded an old CRT TV, and now I'm trying to replace a series of capacitors to hopefully fix some screen geometry issues, and I've run into a little road block on a few o... |
H: Make a Latching double pole single throw relay, using electronic components
I am latching a DPST relay. So I made a prototype using some transistors(ex. BC547) to enabling and disabling the latching. But I want to know whats the correct way of doing it. I have both 12V and 24V relays. And make a complete isolation ... |
H: Exact meaning of the issue mentioned on Errata document
I am using PIC18F67K40. When I went through the Errata datasheet I found out that I am using A3 revision Device.
There is an item number 5.1
Can somebody explain to me what is the exact meaning of this?
I have added snap below
AI: This would only affect you if... |
H: Electronic Circuit Breaker
I want to protect from short circuit by using a miniature circuit breaker. But this has to be manually turn ON, when ever it is turned OFF. So I was thinking to make a electronic circuit breaker which cuts the power supply when ever there is a short circuit. And able to read the state of ... |
H: Measuring continuity on a car battery while connected - damage?
If you were to put both leads on negative and positive terminals on car battery while connected and have the meter on continuity (the one which beeps), what happens and can it fry/ruin the electronics in a car?
AI: It's unlikely to do the car electroni... |
H: Simple circuit with resistors in series/parallel
Given the following circuit, I would like to find the time constant \$\tau \$. I know that at \$t\rightarrow \infty\$, the capacitor acts as an open circuit, so no current flows in it. In an RC circuit, \$\tau=R\cdot C\$, so R in this case would be \$R_1 + R_2\$.
Ho... |
H: Circuit/schematic review ATMEGA328P
Could someone suggest a place where I could request people to look over my schematic/board design?
If this is the place, here it is: https://easyeda.com/be.mihai22/project-hawk
EDIT:
As I see people started looking at this, here's what my thing looks like:
The three diagrams ... |
H: Spectrum of LEDs
How monochromatic is the light from LEDs? I want a set of light sources which will emit light of different wavelengths, as narrow a spectrum as practical.
How wide are the spectrums of typical LEDs?
AI: You will be getting a narrow band, many LEDs have width of about 20 nm at 50% down from the peak... |
H: What is the actual purpose of having a copper foil layer in PCB?
Out of several layers that make up a PCB, one of them is a layer of copper foil (see image below), What purpose does this layer serve to the PCB?
Also, some PCBs have just one copper foil layer on either sides of the substrate and some other PCBs ... |
H: How can 22 awg cable over 100cm deliver 3A
I wonder how 22 AWG cable e.g. USB-A to DC power jack with 100 cm length can deliver 3A.
Why am I asking -> Using this calculator (I hope its correct) by entering values 2% drop, 1 meter, 5V, 3A gives me output 16 AWG. And I am looking for right cable to get.
What I need ... |
H: Generating a current between 0 - 250 mA for a load up to 40 ohms
I'm trying to use a howland current source to generate stable current for a load which is =<40 ohms. The load does not need to be connected to groud. I can work with a DAC to supply the Vin (V3 in the figure), which would help me control the load curr... |
H: Small electronic project kit
I ordered this electronics project kit which consists of a small PCB. You have to solder the components onto the board.
The components are:
Two 510 ohm resistors (green, brown, brown)
Two 33k ohm resistors (orange, orange, orange)
Two transistors
Two electrolytic capacitors
Two LEDs... |
H: Stall torque for servo
My understanding of stall torque is that it's the amount of torque produced by the servo when the output is stationary. Suppose the stall torque of a servo was 10kg-cm. It can lift the a 10kg load at 0.9cm but not at 1.1cm. But does it mean it'll actually drop the load at any distance greater... |
H: What would it take to add Bluetooth capability to a digital (musical) keyboard?
I am completely new to electrical engineering. I have a software background and have an interest in tinkering with hardware.
I'm wondering what knowledge/engineering skill/equipment is required to add Bluetooth capability to an existing... |
H: What is a Current Source?
In EveryCircuit, they have a component called a "Current Source". For example, here is a circuit I've created with a 2A current source:
Is there a such thing as a 'current source' in the real world, or is this an abstract component that helps one regulate current (for example, without hav... |
H: How to find the time constant of a RC circuit with dependent sources
Given the following circuit, I would like to calculate the time constant \$ \tau \$.
I know that in an RC circuit \$\tau=R_{eq}\cdot C \$.
I've also found out that \$\frac{d v_{c}}{d t}=-\frac{2-\alpha}{R C} v_{c}(t)+\frac{E(1-\alpha)}{R C}\$, ... |
H: Why doesn't a short-circuit immediate consume all voltage?
If we assume a short circuit, with zero resistance (not even within the battery), would this 'infinite current' deplete all voltage within the battery? For example, if I "short" a 9V alkaline battery, it will run for about an hour (though the wire gets pret... |
H: How to determine what wire size to use
I feel like I have gone down a rabbit hole and came out knowing nothing. I understand this is a really basic question. My son and I are building a simple RC. It is using 4 1.5v (AAA) batteries in series. So if what I have gathered is correct that is 6v. What I cannot seem to f... |
H: How to find the critical gain K from the root locus
I am going through Ogata's Discrete-Time Control Systems and working out the following problem found on Page 262.
The problem states:
Draw root locus diagrams in the \$z\$ plane for the system shown in Figure 4-45 for the
following three sampling periods: \$T =... |
H: Discharging a capacitor without a resistor
Is the following circuit considered un-safe? That is, can a capacitor be discharged with a bare wire connecting the two terminals, or should some resistance be applied? Why or why not?
Additionally, what are the more common ways used to discharge a capacitor?
AI: It's pot... |
H: Controlling Multiple I/O Devices
How to manage multiple Input(Sensors like Temperature, Humidity, etc..) and output(like motors, relays, etc..) devices connected to a micro controller(Arduino UNO). There are more I/O devices present than the I/O Pins. I am thinking to use demultiplexer for controlling the outputs a... |
H: Why do we need interleaved memory?
I am trying to understand the DRAM working paradigm. I just read this article about interleaved memory. It says:
Interleaved memory results in contiguous reads (which are common both
in multimedia and execution of programs) and contiguous writes (which
are used frequently whe... |
H: Generating more energy from a tree
My son is doing a Science Fair project on dc voltage from trees. We are only getting about 1 volt when they are put in series. He's in 6th grade, what is a simple way to increase the voltage ?
AI: Apparently voltage from trees is actually a thing. Who'd have thought.
This study s... |
H: AC line isolation on multi-level PCB design
Due to space limit I had to design the PCB in multi-level form, the top front side of the PCB is AC line and under that is DC capacitors:
Is the 3mm air gap between AC line and DC capacitors enough for isolation? if not should I place a 2mm plexiglass in between them?
Ed... |
H: How can I switch solar panels on and off with a microcontroller?
I have built a li-ion 18650 7S pack as my solar backup. It is being charged by 3*250W solar panels in series (about 105V 8A.)
My charger doesn't have an option to monitor individual cell voltages. It just charges the battery pack to the given voltage... |
H: How to generate 100 A at 20 kHz?
I have interesting problem to overcome and seek some advice. I need to test different hall effect sensors and magnetic cores. I am currently stack at issue of bandwidth. I tested sensors at DC using 10 turn coil and 10 A DC supply. This approach proves challenging at 20 kHz due to p... |
H: I2C level shifting? 2N7002DW
Can someone explain the 2N7002DW? It seems to be a two-way N-MOS (it has two circuits in one).
I have a master device that runs on 5 V and multiple slaves that run at 3.3 V and they communicate via I2C.
Why is this necessary? Why, for example, would it not be possible to use the 3.3 V s... |
H: How is the closed loop transfer function defined for an oscillator?
an electronic oscillator is a device which can generate some signals without input signals. It is an unstable system realized with positive feedback, as shown in the following scheme:
Now I have two questions:
How is the closed loop transfer func... |
H: What is "shadow" configuration space?
In a github project I saw a feature as follows:
Support for writing to custom shadow configuration space.
I know what PCI config space is but what is a "shadow configuration space"? I google'd but could not come across anything that explains it clearly.
Here is the link to th... |
H: Universal operator
XMN(A,B,C,D)=(A XOR B) NAND (C NOR D).
Is XMN is universal operator?
a. yes without constants.
b. yes with 0 constant
c. yes with 1 constant
d. yes with OR gate.
e. no.
What does it means universal operator with OR gate?
Is there a method without hinting variables, for example, with karno map ... |
H: Finding power absorbed by a voltage source
I would like to find the power absorbed by the voltage source B.
I know that \$P=VI=RI^2=(0.5\Omega)\left( \frac{4-E}{1\Omega + 0.5\Omega}\right)^2\$.
What is the "right way" to find it?
Edit: Basically it gives me three options: \$E=1[V], E=0[V], E=-2[V]\$, and I need t... |
H: Why 0R used in voltage lines in series?
I have a question about eval board schematics of STMP1.
I noticed that zero ohm resistors were used in the PMIC reference circuit.
Why these resistors used in series to the power lines? Need I them really?
AI: Why these resistors used as series to the power lines? Need them... |
H: LED lamp - connecting LEDs in parallel
I have a question about LED lamp:
Quantum Board
It has 16 strings of LEDs connected in parallel. Each string consist of 18 LEDs connected in series. It's supplied with constant current source (with max current 2800mA, what is much more than safe current for single LED/led str... |
H: Current sensing relay with delay on break for dust collection system
I am in the process of planning our a new workshop in a single car garage. I have a large 20A Dust Collector that needs to be on its own circuit or else it will trip. I also have a ceiling mounted air cleaner to get any fine particles that get a... |
H: Switching buzzer on and off with two transistors
I want to make a simple water level indicator with tank full alarm as shown in the diagram. What I want to achieve is, when the tank is full to 100% and water is still flowing through the inlet pipe (ie, the pump is on) the buzzer should beep. I have two outputs from... |
H: Should bus transceivers be used for a legacy M68SEC000?
I'm working on designing a simple "retro computer" based on the NXP 68SEC000. The "SEC" variant (by NXP) is essentially a Motorola 68000 with a few differences. Such as the inclusion of A0 and it's a static/CMOS version.
I'm also reading through the excellen... |
H: Is there a difference between measuring the resistance using a multimeter ohm function and using the voltage / current relation?
I need to measure the electrical resistivity of a concrete sample following the procedure described in ASTM C-1760.
The procedure requires a 60V DC potential to be applied across the con... |
H: Inferred latch occurence in verilog
Implement the following circuit:
Note that this is a latch, so a Quartus warning about having inferred a latch is expected.
This is my implementation
module top_module (
input d,
input ena,
output q);
always @(*)
begin
if(ena==1'b1)
q=d;
else
... |
H: Using a 555 timer and 14-stage binary divider for 2 hour timing circuit
I am researching how to design a timing circuit that will activate a relay with a push button and deactivate the relay after two hours. My understanding is that I can feed the output of a 555 timer to the input of a 14-stage binary divider. The... |
H: What's wrong with this PWM-controlled constant current sink?
T10 gets very hot and starts melting within 30s, even with a heat sink and values way below its rated 15A.
Edit:
I know it is not a true PWM controlled constant current, but that what I can do with the parts that I have access to. As for the current bei... |
H: STM32 f401re power issue?
I get the following error when I try and upload code
Error in initializing ST-LINK device.
Reason: No device found on target.
The voltage is across VCAP1 is 0 which I find a bit odd.
I have alligned the chip as per the data sheet which can be seen in the following photo.
I am quite lost... |
H: When does a transistor turn on
I am having a very hard time understanding when exactly a transistor turns on. For example in the following circuit from Everycircuit:
Why does the transistor turn on when the push button is off, but not when it's on? The only way it seems to make sense to me is that the voltage rel... |
H: Can I somehow control a PSU-powered fan using a 4-pin fan output on the motherboard?
I have a 12V 29.4W 3-wire Delta Electronics fan that I want to power using an EVGA 750 G3 PSU and control via one of the 4-pin fan terminals on an MSI MSI Z390-A PRO ATX LGA1151 motherboard.
Not considering the wattage of the fan... |
H: Does Diode Position Matter in Series?
I've put together this circuit, and (with some help from EE SE) it's working great.
I have it wired like this:
where the diode comes first off the middle transistor pin, and then the motor negative comes next. The motor negative lead and diode are not touching (except that th... |
H: Hypothetically, 6 or more phase line with same mechanical energy?
So I don't understand a concept of mechanical to electrical energy conversion.
Let's assume I have a 3-phase generator and need X amount of mechanical power in order to get 200 Volts Phase-Neutral.
Now suppose I add some windings etc. so that I have... |
H: Op-Amp Oscillation
I'm trying to design an inverting amplifier that has a gain of about ~30. It is required to be a two stage design with the first stage being none inverting and have an input impedance of >=500k. The input frequency would be ~160kHz to 200kHz. Below I've built a preliminary circuit that only has a... |
H: AC to DC power supply questions
I have built the circuit in the diagram below with a couple of minor changes. I desire 3 DC outputs - +12, -12, and +5 volts. So, the changes I made is to use an MC7812BTG for the +12 and an MC7912BTG for the -12. Then I simply added an LM7805CT after the 7812 to get my +5. I made 2 ... |
H: TLP175A High Load alternative
I came across this IC and it is an IC i need, but i would like to controll a heavier AC load with it, 220V 1A but this particular device is for low volatage levels. Is there high load alternative for this IC or a tool that will help me search through the alternatives in future
AI: Is t... |
H: How to find phase shift(angle) between two signals in simulink?
So I'm doing a delta wye transformer in simulink and phase shift between these two signals should be 30 degrees, but how to show that, or calculate it? And how to find angle of each signal?
AI: Use the frequency and period of the wave.
Then the equati... |
H: Smith chart tutorial question
I am looking at a Smith Chart tutorial on the antenna-theory.com website. Unfortunately, I'm confused by one of the examples given...I don't get the same answer, so it's safe to say I'm doing something wrong. I was hoping someone could point me in the right direction.
It's example 2 on... |
H: Value of loop gain for steady state oscillations
I was reading on a book (High-Frequency Oscillator Design for Integrated Transceivers, J. van der Tang, Dieter Kasperkovitz, Arthur H.M. van Roermund) this paragraph about the start-up condition for an oscillator:
Let's consider for instance a common base Colpitts ... |
H: How is the amplitude of an output signal of a binary input determined using a constellation pattern?
I understand using the pattern to find the output line single phase but how is the amplitude determined?
AI: But how is the amplitude determined?
By the length of the line from the origin to each constellation poin... |
H: What is this connector type
Could anybody help to identify this connector type? I know it is kind of old.
AI: Looks like 5-pin 180° DIN connector. |
H: How do we explain the common-mode feedback in an intuitive way?
There are such beautiful circuit ideas that make you hold your breath and admire them silently. Such an idea is the common-mode feedback (CMFB) in fully differential amplifiers. I was not familiar with this idea and started thinking about it when I met... |
H: How to generate desired voltage signal in a circuit?
What I am asking is a design or pulse shaping question.
We learn about analyzing circuits but not designing them in school.
Let's say I have an input signal which is a triangular wave and I want to generate some output signal with some sophisticated shape that ... |
H: How accurate are the crystals on ST's Nucleo boards?
I got myself a cheap ST Nucleo-L053R8 on discount, to play around with a couple ideas.
The main STM32L053R8 only has a low-frequency 32.768 kHz crystal for RTC, but it can also be provided with an 8 MHz clock from the included ST-Link USB programmer. The LF cryst... |
H: What are the pins on this jack connector?
I've bought a PJ-3053 audio jack connector. I purchased it under the impression that it would have a microphone connection, but when I put in a TRRS jack, take a multimeter and measure connections, none of the pins gives a beep with the shield from the jack I plug in. It do... |
H: Are FPGAs used as Cubesat flight computers?
Are FPGAs used as Cubesat flight computers and are there benefits or drawbacks in using them?
AI: Are FPGAs used as Cubesat flight computers and are there benefits or drawbacks in using them ?
Yes, they're used.
Their biggest disadvantage in a satellite is that they are ... |
H: ICSP + FTDI for ATMega328P
I want to have this "debug" header with 10 pins (I could probably get away with 9) and I am wondering if the DTR pin is ok to be filtered by a capacitor for ICSP.
This is how I am sourcing these pins:
Note the capacitor in magenta. Will that affect the RST line for ICSP?
Why? Why not?
A... |
H: Verilog: use calculated variable as length or index of another variable
I need to expand and truncate variables a lot in my Verilog project. The issue is that the constraints for these operations are dynamically generated.
Example:
function sometruncation;
input a, b, Z;
integer x;
begin
x = a + b;
so... |
H: Capacitor in series with transistor base
I am fairly new to electronics and just had a quick question. I saw the following suggestion for a one shot trigger to wake up an ESP from for example a PIR sensor with one shot trigger and to read the data on another pin:
I do not understand how current can reach the base ... |
H: What is the maximum voltage for MPPT/PWM to charge a X volt battery?
I currently have a PWM 12/24v (auto commute) with ~18V as input and a 12V battery in the output.
I wanted to switch to 24V battery and I thought about going ~36v solar panel. (18V * 2)
Then I saw online some examples of putting more in series for ... |
H: Elenco Digital/Analog Trainer XK-700K Output voltage off
A week ago, I was given a project by my professor to do part of it and then give it to another student. After soldering the power supply section of it and testing the resistances/voltages, I get a voltage of -10.11V as an output of a -20V voltage regulator(L... |
H: Design my own footprint or find one?
I am designing a PCB based around the STM32H7 MCU, which is a LQFP144 package. I'm designing in Altium and was using the Altium vault to find components.
I noticed my specific MCU isn't on there, but other variations e.g. STM32F7 with a package size LQFP144 are.
Just starting o... |
H: Can capacitors be used to make a low-impedance ECL termination voltage?
I am trying to develop a circuit in which an RF sinusoid is put into the input of the ADCMP552 PECL output comparator and then the PECL output (square wave ish) is input to the MC100EP140 phase frequency detector, ideally as LV negative ECL. I... |
H: Is placing the ground in this small signal model wrong?
There is an example in a text where it shows the small signal model of a circuit.
Below on the left there is a transistor circuit and on the right its small signal equivalent:
I'm a bit confused whether I'm not mistaken about a point since in all editions the... |
H: Are all linear regulators bad at filtering input ripple? (or really as bad as Dave suggests)?
Background
In EEVBlog #1116, Dave discusses a method to remove power supply ripple, and goes on to show (see 5:17 to 6:15) that you cannot count on linear regulators to remove your input ripple. He gave a concrete example ... |
H: Why are there three transistor pairs in a class B power amplifier circuit?
I have a class B amplifier circuit to be done in lab. Why are three pair of transistors used in this? I suppose one is a Darlington pair but what is the requirement of the third one? Also, why is there an unequal mumber of diodes even if an ... |
H: How much does voltage affect the light frequency output of an LED?
I have a large array of LEDs that I need to be true to their datasheet light frequency emission (ex 635 nm.) The LEDs require Vtyp @ 20 mA ranging from 2.2 V to 1.2 V. Some are within 0.1 V of each other.
In the interest of minimizing the number of ... |
H: How to unground microwave transformer
I'm trying to make MOT tesla coil and would like to connect secondary coil in series. The low voltage end of secondary is connected to the body of the transformer. I don't particularly want to disconnect this as it may be useful for some other projects. Is it bad to connect the... |
H: Determining the voltage of 5 phase PMSM motor
As a part of the project, I have to design a 5-Phase PMSM motor, for which want to know the following:
How to determine the voltage ?
What should be the ideal voltage to use this motor in an electric car? Provided the car has 12 battery packs of 12 volts ( i.e 144 V su... |
H: AVR gcrt1.S behavior
So basically i have decompiled unoptimized simple program and saw that it runs through gcrt1.S, and i dived in to assembly language and tried to understand what exactly it does. here is my code and my assumption of what it does
00000034 CLR R1 Clear Register
00000035 OUT 0x3F,R1 ... |
H: Smoothing out current spikes so three-phase machine doesn't exceed site's electrical supply
We are looking at installing a machine at one of our manufacturing sites that draws around 120A at 415V three-phase (we are in the UK) but the maximum current we can draw at our site is 100A before the breakers trip. We have... |
H: DCDC converter in series
I need to convert 5V (main power supply) to +/- 30V. I have two +/-15V DCDC converters and was wondering if I can connect them in series to generate the +30V and -30V rail?
My simple schematic
I tried simulating this circuit using Mplab MINDI, but there are only DC power sources and I am n... |
H: Extension for CCFL tubes
I have an inverter for cold cathode lights powered via a molex connector from a PC power supply, with a PCI/PCI-E slot bracket where is placed an ON/OFF switch, and I would need to use one light at a longer distance, exactly at a distance of 7 and half metres. There is a 2-pin connector lea... |
H: what is I2c address of BNO055?
I made a custom circuit with bno055 it shows i2c address 0x70 is it possible?
I used the Arduino i2c scanner. I am not getting any data aswell
nothing else is connected to Arduino nano board as well,
I am using 5v to 3v3 TTL logic level converter board as well
vdd 3v3
11 and 14 not... |
H: Why is this MOSFET KVL to find VDS not right?
There was an answer provided for this question I'm working on, but it seems that my answer was wrong. The sticky note has was the "correct answer" is supposed to be, but I don't understand why V-minus on the source is not included in that KVL equation.
AI: An ideal curr... |
H: Can I use a 2.4 GHz rated parabolic MIMO antenna for 700 MHz Verizon 4G LTE data?
Can I use a 2.4 GHz rated parabolic MIMO antenna for 700 MHz Verizon 4G LTE data?
It seems 700 MHz are a long ways from the range of a 2.4 GHz antenna, but I have seen people marketing similar looking parabolic antennas that claim the... |
H: Swapping out RJ-45 connector on Differential I2C circuit
I'm trying to use Sparkfun's Differential I2C Breakout circuit into my own design, and I'm looking to replace the RJ-45 connector. It's too big (having a footprint size of 15.24 mm x 15.24 mm), and I have some requirements that I need to meet. The original bo... |
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