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H: Will EMI strongly affect my sensor reading
I'm using an Arduino to read analog values from my sensor running at 5V using a voltage divider. The sensor contains a force resistive sheet where the resistance of the sheet decreases as force is applied on it, and the sensor is used to determine whether someone has stepp... |
H: Ground isolation
I am looking at ways to isolate my board and supply ground. I am feeding my board with a 40V dc power source. Now, the ground return of my board should not be connected to the battery return is the suggestion from the customer. Now, to isolate the ground I know we can use a transformer. But transfo... |
H: Why altering open loop gain is necessary in amplifier's frequency compensation..?
The text says that "the amplifier requires compensation because its basic open loop gain is still higher at frequency where internal phase shift are reaching 180 degrees..This turn negative feedback to positive at higher frequencies ... |
H: 2nd order Sallen-Key Bandpass filter design in Matlab
I'm trying to design a Sallen-Key BPF within Matlab. With the documentation found on ti: http://www.ti.com/lit/ml/sloa088/sloa088.pdf, I studied and understood the basic.
As for the design: The center frequency of my BPF is 40kHz. Q-factor and gain at center fr... |
H: Power of a capacitor when is connected to a battery
According to definition of power ( current times voltage) since there is no change in charge, the power stored in a capacitor connected to a DC voltage is zero. Since energy is power times time, Energy stored is Zero too. But we know in a transient period the capa... |
H: Difference between ADUM6403 and ADUM6403ARIZ?
I bought ADUM6403ARIZ and I am thinking how it might fit ADUM6403.
I am thinking the differences between the two chips
ADUM6403
ADUM6403ARIZ
ADUM6400ARIZ should be equivalent to ADUM6403, but not sure how equivalent is ADUM6403 to ADUM6403ARIZ.
Manual here.
There ar... |
H: Arduino does not receives response over RS-485
I am using arduino uno to communicate with my industrial drive. I am using juan bester library for RS485 communication.
Now here's what's happening:
When I open serial monitor in my arduino after uploading the sketch. I can't see the RX light flash on my arduino. Tx r... |
H: Cable rating - What is the max amp for a 1.5-1.75mm cable?
I have a new hob (magnetic induction plate). It requires 7200W/32A.
The power grid's voltage is 230V (Europe).
I have already installed a thick cable and I want to use it (it would be difficult to change it). But I don't know its diameter (and at the momen... |
H: register transfer
I am trying to understand RTL(Register-Transfer level) systems and in particular the implementation of the control subsystem by means of sequential execution graphs. I don't understand how to implement a construct like this:
if x>=x_ref
(do something)
else
(do something else)
end
I think that I ... |
H: Need gate driver for MOSFET (IRF540) and microcontroller
I'm trying to use a STM32F100RBT6B microcontroller to turn on a n-channel MOSFET (IRF540) to switch on a voltage of 24V to an electrical magnet.
I understand I would need a gate driver between the microcontroller and the MOSFET. I know the NMOS Qgs is 10nC a... |
H: Output voltage function (circuit-analysis)
What will the function of the output voltage be?
My work, and am I right?:
$$\text{V}_{\text{out}}(t)=\frac{\text{R}_9\text{V}_{\text{in}}(t)}{\text{R}_{10}}+\frac{1}{\text{R}_{11}\text{C}_1}\int\text{V}_{\text{in}}(t)\space\text{d}t+\text{R}_{12}\text{C}_2\cdot\frac{\par... |
H: Retrofit a Hi-Fi remote with a RF 433 MHz module
In the past I used a remote for a AIWA Hi-Fi to control a AVR processor and circuit I custom made. I used an infrared receiver from Vishay (tuned on the 38 kHz) to demodulate the signal, then fed to the AVR (custom board, not Arduino).
The remote I have uses NEC prot... |
H: What AC-to-DC adapter would I need to power two of these battery (3V) powered door contacts at once?
I'm new to electrical wiring. I understand circuits, soldering, and basic wiring in parallel / series but calculating and understanding draw, resistance, etc. is new to me.
That being said, I have two of these htt... |
H: Is this STM32F based CAN bus circuit ok?
So this is my first time moving away from Arduino based projects and I am now planning a project using the STM32F105RBT6.
It is a simple CAN bus analyser with some leds. I may add some extra i/o in the future.
As for the power supply, I plan to have it powered from a 8-30v i... |
H: Regarding STM32f103 bootloader
It is given in STM32 system memory boot mode APP note that bootloader stored in the internal boot system memory is programmed by ST during production.
Does this mean that if I buy a new STM32 microcontroller and want to load my programs into the microntroller I don't have do the initi... |
H: Why alternators are used to generate DC?
Why is it that to generate DC, it's often an alternator that's used? Couldn't commutator rings be added and do without AC-DC conversion?
I'm asking because I wonder how efficient it usually is for a typical RC car motor to be used as a DC generator.
Thanks
AI: For automobile... |
H: Dual mode Bluetooth for transmitting audio and connecting with an App
Hi my name is Raveen Baloo from Singapore. Currently, I'm working on a project, building a case box which has a MCU and a LCD
screen. A removable bluetooth dongle is connected to the case box which will allow users to connect and display a mess... |
H: Conditional Voltage output
I apologize if this is extremely simple, but I am trying to design this:
I input 2 voltages, one is 12 V and the other is on the order of .5V. I want to know if there is something I can set up that will output 12 V if the reading of the smaller voltage is larger than a certain value.
i... |
H: How to Connect USB/Ethernet Shields to Chassis or Digital Grounds
I have a PCB with a few USB and RJ-45 Ethernet connectors on one side. I'm quite confused as to how exactly I'm supposed to be hooking up the SHIELD pins on them though.
This is for a host device that will interface with peripherals. It is provided r... |
H: Could A28A transistor work for controlling Rx/Tx pin?
I want to control a robot with my arduino via RX/TX.
Here is the wiring:
They recommend transistor pnp 2N4403.
Another guy said that a small signal, low power PNP transistor such as 2N2907A could be used.
Howerver, the only pnp transitor that I have is A928A.
ht... |
H: Do I really need an H-Bridge controller in this application?
I'm looking to integrate a latching solenoid in my next project. I found a 5V latching type here: LHLA0531111H
The manufacturer recommends I use an H-bridge to control switching of the solenoid. The have a few schematics here.
Instead of using an H-bri... |
H: Issues related to multiplexed analog signals
I had an idea to transmitte a measured voltage of component X, from multiple slaves to one master device. Each slave's units would use the principle of time division multiplexing to set the data line to the corresponding analog level at a predetermined time and for a pre... |
H: Verilog BitSet Circuit
A specific type of bit-level manipulation consists in setting or clearing one single bit in a multi-bit value, given its index and its new value. This operation can be implemented in hardware by a BitSet circuit with the following interface:
Input x is a 4-bit value representing the original... |
H: Soldering error with wire
I was soldering a magnet wire with a normal copper wire, and while doing that, i burned a small part of the magnet wire, so will this affect the conductance of the wire??
AI: Most likely you burned the insulation, not the copper part of the wire. Be aware that burned insulation no longer ... |
H: Integrating wireless transmitter with old door chime system
The building I live in have an old door-chime system, and I wish send a wireless signal when the door-chime is triggered.
There are multiple push-buttons at different locations connected to the same circuit. The only place I can access my part of the wirin... |
H: Optoisolator, did I connected it right? (Arduino Uno)
Here is my connection for optoisolator,
2 wires, yellow and red are for AC current.
Other 3 in my arduino, orange pin 2, blue ground and red 5V power.
And diagram.
Datasheet for optoisolator:
http://www.vishay.com/docs/83608/h11aa1.pdf
I am using h11aa1 optoi... |
H: 74161N counter isn't counting with clock input
I am trying to get a 74161N 4-bit counter to work. If I connect the clock input to a button to ground, pressing the button increments the counter. Unfortunately due to the physical connection in the button, it will sometimes send out extra pulses causing the counter to... |
H: What does a large capacitor do in small signal analysis?
I keep having to look this up. It seems as though I have yet to find a great way to understand this.
In small signal analysis:
What is the difference between a large and small capacitor?
What are they modeled as?
What is a good way to remember it?
Further ... |
H: suggestions for solar charging battery-operated device
My battery-powered wireless device draws about 50mA @ 5V. I’m thinking of powering this off a 12V 7Ah SLA battery that is topped up with a small solar panel (12V, maybe 500mA or so). 12V to 5V will happen with a DC-to-DC converter. Can I just connect a solar pa... |
H: Controlling Two Circuits with One Switch
I'm trying to build a circuit with multiple timers, each with an SPST output relay. I want to connect up my circuit so that if any of the timers reaches their set point, they turn on a beacon. It doesn't matter how many timers reach their set point, as long as one has I wan... |
H: How to analyze this diode circuit for a resistance?
I'm sorry for posting a textbook question, but it does not provide any explanation and I am pulling hair trying to make sense of this.
I tried converting each of the diodes to a 0.7V DC source with positive terminals up. Then I thought I found the equivalent resis... |
H: Trying to understand Battery Chargers
I just started studying about batteries and battery chargers. I have this simple query so please help me out.
I am trying to charge my 3000mah li-ion battery. The battery voltage is around 3.6v and the charger regulates the 5v from the source to 4.2v. I connect the battery to t... |
H: solar power ESP8266 microprocessor circuit to turn off when low voltage
I intend to run an esp8266 microprocessor on only solar panels so it is on during the day and off/disabled during low light conditions that do not supply sufficient power.
Is there a circuit that will hold the esp8266 reset low until voltage is... |
H: What is impedance 'masking' and how it is related to impedance 'matching'?
While reading ECSS-E-ST-20C Standard, I have encountered with a concept named 'impedance mask'. However, I could not find any detailed definition or explanation related to it.
In the corresponding article, it is said that :
"At the point of... |
H: How does buffering in the MCP79410 RTC work?
From the MCP79410 datasheet, p.16:
Doesn't this mean that the data is being buffered when I read the seconds register, then again when I read the minutes register, and so on? This would mean there's no buffering at all. I would expect data to be buffered e.g. when I rea... |
H: What kind of transistors are prone to gate/base floatation?
What kind of transistors are prone to gate/base/etc flotation?
I know for sure that n-channel MOSFETs need a resistor connected to the ground to keep the gate low to obviate chances of flotations. But I don't know about other types of transistors like bjt,... |
H: What is the maximum bitrate supported in the Can Bus?
i began reading about Can Bus for my final year project
i have to send a file to be flashed into the microcontroller using the CAN BUS .
I have found that the maximum bitRate that can be achieved is 1Mb/s but there is a lot of things to consider like the ack. ti... |
H: How to properly describe a Math Equation in Verilog to be synthesizable?
I have not been able to find a book or information in internet, about the correct way to describe a Math Equation in Verilog.
With the correct way I mean for example, how to analyze the equation and to express it, Behavioral? Sequential? How t... |
H: Capacitor for current transformer measurement circuit
I want to measure an AC current with a current transformer and an arduino device. I found on a website (http://www.homautomation.org/2013/09/17/current-monitoring-with-non-invasive-sensor-and-arduino/) that measurement circuit:
My question is, why do I need a c... |
H: Outlet grounding confusion
I don't have much AC knowledge, but I am willing to learn. I've been surfing the web to find out more about outlet grounding. I still want to know more, that is why I am asking this here.
Grounding an outlet means to connect a third wire (apart from hot and neutral) to the earth by some c... |
H: What are the advantages of a synchronous switching regulator?
DC-DC switching converters come in synchronous and non-synchronous varieties. What are the advantages of the synchronous regulators? Are there different advantages for a synchronous buck versus boost regulator? Am I likely to need the same number of exte... |
H: Consistency of thermal heat paste
I want to use thermal paste for improving the thermal resistance between a semiconductor and a cooling element. But when I got it out of the tube, it was party transparent/fluid, and partly white/pasty. Can I nevertheless use it, or should I remove the fluid, or should I rather buy... |
H: 35v reading on 24v transformer
im troubleshooting a 24v ac transformer hooked to two doorbell circuits and on one of them I am getting a 35v reading. What could be causing this?
I am reading the voltage using a standard (cheapo) non auto-ranging meter set to 200v ac (the lowest setting)
Im not actually measuring a... |
H: What does the circuit look like to switch two lights using two switches into four different states?
At my workplace there's a room with two entrances, each featuring a push button light switch, A and B. There are two ceiling mounted lights, 1 and 2.
Switch A switches both lights on/off. Funny enough, if both lights... |
H: insertion losses
I know that attenuation doesn't change with frequency of signal. However, during my experiment, I found that there is a slight decrease in amplitude of signal when frequency is increased. Can anyone explain its why does it happen?
AI: The attenuator is made from resistors and is intended to have a ... |
H: Sensor Tranfer Function
I've this transfermodel, my controller is a PID-controller and my sensor is this, how can I find the Tranfer Function of the sensor?:
AI: I couldn't find a proper datasheet for the part you listed, but you can figure out the transfer function from a code example on the wiki page here: http:/... |
H: Basic Circuit Analysis using Kirchhoff and Ohm's Laws
So I'm in an introductory circuit analysis class where all we have learned so far are Kirchhoff's and Ohm's Law. I am practicing how to solve these circuits, but for some reason I can't understand this example. I keep getting 3 Amps for \$i_5\$, but it says th... |
H: Will a 110-220v to 12v converter work with a DC 12v 3w LED bulb?
I'm planning to create some wall lights using these LED bulbs. Would I be able to just use any 110-220v to 12v converter to power this at home? I live in the US (120v).
I was thinking of using this converter. Thank you for any help!
AI: All you have t... |
H: Using european telephone cables for own DC power delivery
I have european telephone cables running through my walls to each room, without any connection/socket. Well... we really do not need any hard line telephone connection and I am into DIY projects, so I want to make use of these cables. I thought I could use t... |
H: PCB mount socket for 1mm diameter pin
I have a module that I want to be able to plug into a custom PCB (i.e. not solder directly). The pins of the module are 1mm diameter and would be inserted perpendicular to the custom PCB. What sort of standard sockets exist for this? I have been unsuccessful searching on Digike... |
H: Why is this diode here?
I am building a VU meter. Searching in the Internet and coming up with some things on my own, I ended up with the following circuit
First, there is an amplifier whose role is to give the VU meter the amplitude it needs to work. I put a voltage follower after that stage to isolate the input ... |
H: Replace inverter manual potentiometer with mcp41010
I have an 3 phase ac inverter that uses standard potentiometer for motor speed regulation.
The speed reference voltage is 0-10v and i need to control it using arduino. In MCP41010 datasheet I couldn't find the maximum voltage between the potentiometer pins only ... |
H: half bridge converter weird primary current waveform
I build up a half bridge converter(as illustated in figure), today I measured current of one of the primary switchs(MOSFET), but something seems weird, while I expecting a triangle current shape, the current is measured as illustrated in graph with blue one, by t... |
H: Charging circuit for bulk 1.2v 1200mah ni-cad batteries
I am seeking advice about how to construct a charging circuit for 1.2v 1200mah ni-cad batteries. I have around 60-70 of these batteries and I want to create a bulk charging circuit so I can charge 5 or more (preferably 10 or so) at once while still being able ... |
H: How can I assemble and control two different hands on a watch face?
I want to make a device with two hands that rotate independently of each other, just like the hour and minute hands on a watch. I'm struggling to figure out how to actually design and implement this though.
Both hands should be able to rotate arbit... |
H: How to access the data stored in HDD?
I removed the HDD from my broken labtop to take the data stored in.
This is the HDD:
I don''t know which cable I can use to connect it with my new laptop with USB port .
Could any one explain to me how can I do that?
AI: You can buy a 2.5" USB HDD caddy. They're fairly cheap... |
H: What does the GSM AT+CSQ command output signify?
So the command returns the received signal strength(RSSI) and bit error rate(BER). I see that the RSSI is obtained even if the SIM card is not inserted in the GSM module. So what does RSSI signify?
AT+CSQ
+CSQ: 25,6
OK
Also how can we check if the network signals are... |
H: Double CD4017 leds driver 555 clock
The very cool circuit is from here:
http://engmousaalkaabi.blogspot.com/2016/01/81-led-chaser-using-double-ic-4017.html
Here are my few questions regarding it.
1, It has 18 transistors. are they really required for lighting up some small LEDs? I think 9 transistors should work.
... |
H: How to find Magnitude of transfer function
I am trying to read a paper by Butterworth on his filter.
There is a term called filter factor which is said to be the ratio between output emf by input emf.But i am not able to understand the mathematical expression.I want to know weather is it the transfer function as if... |
H: Low noise amplifier
Recently, I got a low noise amplifier (i.e., ZFL-1000LN+ from MiniCircuits, http://194.75.38.69/pdfs/ZFL-1000LN+.pdf) with two wires already soldered in the turrent terminal pins. Today I have been trying to use it, but unfortunately it did not work. I connected the wire soldered in the GND pin ... |
H: Is it possible to directly interface a MEMS ADMP541 microphone over I2S with any Microcontroller?
I have bought a MEMS ADMP541 Evalution kit to record voice samples with arduino controller
MEMS microphone will produce digital o/p , I2S communication protocal
My question is should I directly connect the MEMS micro... |
H: BLDC motor/PMSM parameters at reduced operating voltage
I was thinking about nameplate parameters of BLDC motors/PMSM and wondered what happens to those values if I operate the motor at a lower voltage as rated.
Are my following conclusions correct?
If one reduces the voltage to the half of the nameplate value, Mr... |
H: Designing a Sequence detector
The problem statement is not exactly on synthesizing circuit but in one of the interim steps that I am trying to learn.
Problem Statement.
1) In order to design a sequence detector in Verilog (using structural modeling) I was learning to synthesize digital circuit first and stumbled... |
H: Can I ignore resistor for IR LED?
I have two IR diodes and I want to connect them to my Raspberry Pi. From Pi I have 3.3V voltage. Diodes are TSAL 6200 .
Can I connect them to PNP and my PI without resistor safely with this wiring?
AI: Connecting two diodes in parallel:
No. Don't do this. The maximum voltage for th... |
H: What good is an induction coil in a dimmer switch?
I asked about a dimmer switch, and was told one has an induction coil. What benefit is an induction coil in a dimmer switch?
ZE-02S has induction coil built-in on the circuit board, so it is 5/8" longer than ZE-02.
http://www.ebay.com/itm/ZE-02S-Floor-Lamp-Rotary... |
H: What are the different ways to switch power using a microcontroller (Arduino, Raspberry Pi, BeagleBone, etc.) and what are the pros/cons for each?
I'm using an Arduino to control a 12v water pump for a self-watering plant wall. I'd also like to use the same power supply for both, and probably need surge protection ... |
H: Are there reasons besides audible noise to run a VFD at a higher carrier frequency?
VFDs - variable frequency (motor) drives - output a pulse-width-modulated carrier approximating a sine wave. The carrier frequency is typically variable. I've seen numbers as low as 1 kHz, and as high as 16 kHz. Higher switching fre... |
H: RC Servo Safety
I've been working with a couple of RC Servos lately and I had to ask this.
Is it safe to rotate the servo manually with hand when it is powered off. The servos are made up of metal gear trains and have insane torque ratings (40kg/cm to be specific). This is something that I need in my project, so ho... |
H: How to detect end of avaliable movement of mechanism connected to a stepper motor, without external detectors?
I have access to (not quite working) 3D printer. It has no endstops, no switches that would detect extreme positions of head or table. I know this because I was there when it was assembled. All cables are ... |
H: Wire microswitch so state can be read from Raspberry gpio
I'm trying to check whether a series of valves (described here Can I measure if current is on or off in cable with 24v DC (in a cheap way)) are open or not.
Updated question to be more specific after getting some answers:
If I mount a micro switch, like the ... |
H: Pin Assignment in ispLEVER Classic
I have an ispGAL22LV10C that I'm trying to program. I wrote and synthesized the VHDL in ispLEVER Classic, but I cannot seem to figure out how to create pin assignments. Documentation on this is kind of lacking, how might I go about this? I cannot seem to find this fabled "constrai... |
H: Driving 3V motor, BDX53C
Briefing:
Trying to drive a 3V motor with gearbox, using TM4C. Motor specs are given below.
First tried with 2N2222A, later plugged motor directly in to LF33ABV voltage regulator. On both setups, motor was quite weak and wasn't moving properly even under small loads. I guess it was becaus... |
H: LTSPICE Bridge Rectifier - Odd Output
I'm trying to simulate a simple full wave rectifier in LTSPICE. The output I am getting is not what I am expecting. In the picture below, the green line is the voltage output from the + terminal of the sine wave, the blue line is the - terminal of the sine wave and the red line... |
H: Best way to implement outputs pins with leds in a parallel way
What is the best way to implement an output but with also a led, so I can use the output for other purpose (for example a GPIO for a PIC, or a lot of logic gates) but with a led indicador that the output is in high? I want to preserve the enough current... |
H: What is the dual of a diode?
A diode has an exponential I-V curve. To a first approximation, it will pass whatever amount of current is required to keep the voltage across it constant.
Is there a passive component that will (approximately) drop any amount of voltage to maintain a constant current, possibly with a l... |
H: Difference is Bluetooth Smart and Bluetooth audio
My name is Raveen Baloo. I have been doing a lot of research on the types of Bluetooth module. For my project, i do need a bluetooth which will be able to have simple communication with a mobile app, sending over sensor data and do simple command. The bluetooth chip... |
H: VHDL timing question
ENTITY top IS END top;
ARCHITECTURE example OF top IS
SIGNAL w,x,y,z : integer := 0; -- initialised to 0 (zero)
BEGIN
p1 : PROCESS(z)
VARIABLE a : integer := 0; -- initialised to 0 (zero)
BEGIN
a := a + 20;
w <= w + 10;
x <= a + w AFTER 10 ns;
y <= a - w AFTER... |
H: Calibrate without a known good voltage source
I'm traveling and don't have a known exact voltage source. I do have a variety of electronic components such as resistors of various flavors and am wondering if there is some kind of trick to getting a known voltage value against which I could calibrate a DMM ( which wo... |
H: Maximum forward current on ESD diodes
I'm interfacing a dsPIC33EP512MC806 with a set of analog systems. The analog systems manage a battery and have vregs for the digital systems. The analog systems measure the voltage and current consumption of the battery providing feed back to the micro. The current is measured ... |
H: orthogonal singal generator
I am working on a single phase PLL (phase locked loop) and I would like to make a phase shift by using orthogonal signal generator non frequency dependent.
I have found many method like transport delay, inverse park transformation, Hilbert transformation, or Second Order Generalized Inte... |
H: What is the type of memory of a USB Flash drive and on a hard disc?
I know there are different types of memory such as ROMs,DRAMs,SRAMs,etc.
I don't understand what is the type of memory on USB Flash drives that we use so often and on the hard disc of a PC. Can you please explain me?
AI: Spinning disks use magnetis... |
H: How to increase the current in this circuit?
Im trying to build a circuit to send information using IR led, using pulse signals (Im trying to mimic a home appliance remote control).
My leds (datasheet) operate at 1.3V, and their maximum pulse current is rated 200mA
I need a very strong signal and since the "command... |
H: Need to Determine Power Cable For Old Bose Found In Basement
I recently purchased a home, and in the basement is a Bose Lifestyle surround sound system. The 5 speakers all plug into a base unit which I have determined is missing a power cable.
In the unit, there is this:
120V 50/60hz 350W Max
I'm not sure what all... |
H: Voltage divider resistor power disipation
I am trying to create a power supply circuit for the ESP8266, using a voltage divider and a cellphone charger rated at 5V, 1A as power supply.
I have resistors connected like this:
The resistors are rated at 1 - 6 W.
Using an online calculator for power dissipation i get 9... |
H: Vpp for American split-phase 110V AC
I know the 'nominal' voltage of 110/115/120 is both based on Vrms and that stability @ any of those levels is pretty much a fairy tail.
I also know that most rectifiers will output ~130-150V after re-assembling the waveform & filling a comditioning cap.
What I'm not 100% sure on... |
H: How is data transmitted on different media?
Thinking about computers primarily, I'm trying to get my head around how data is transmitted along various transmission media. In particular, I'm getting confused between the use of electromagnetic waves (EM) and voltage (V).
Firstly, am I right in thinking that data can ... |
H: Measuring power, current and voltage
I guess the way that the power consumption in our homes is calculated, is by calculating the amount of power that each appliance in the home is using. Since power is current times voltage, does it mean that the current that is drawn by each appliance is multipled by the voltage ... |
H: Will this OP AMP work for this application?
I designed the following circuit in CircuitLab. My question isn't about the whole thing, but rather about the TL081 Operation Amplifiers that circuitlab uses as a default(data sheet found here).
simulate this circuit – Schematic created using CircuitLab
This design is m... |
H: How camera calculates amount of color per pixel
I don't know where to post this question sorry if it's in wrong section.
I already know how pixels works they are combination of three colors
RED, BLUE and Green. But they should be mixed in different amounts to
create a required color, I wanna ask how camera measures... |
H: repeatedly turning an incandescent light bulb on and off every 20 seconds will cause damage to the bulb?
I have seen similar questions to this one but none of them were asked in the range of seconds only minutes.
I just finished building a incubator for chicken eggs and I am using an incandescent light bulb as sour... |
H: Input circuit to handle both single ended and differential motor encoders
I'm working on a motor controller design that I would like to be as flexible as possible without driving up my BOM cost and board area more than necessary. To that end, I would like to use a single input circuit and connector to handle both s... |
H: VHDL Code for 4x4 Mult: SYNTAX OK BUT ERROR:HDLCompiler:1029
Hello this is my first post here, I have some code that I've written that I'm having trouble with. I was hoping I can get some help.
I'm having some issues with my VHDL code for a 4x4 multiplier.
The schematic I'm using is below:
Running a Syntax check g... |
H: Why does this circuit produce a static noise?
I was just designing this Common emitter transistor amplifier this morning.
simulate this circuit – Schematic created using CircuitLab
I have removed the input in the circuit intentionally. Here are a few words about the circuit:
I constructed initially with only one ... |
H: Eagle create custom size SMD pad for new library part
I am working on new Eagle part in custom library on page 7 of its datasheet there are visible dimension of IC:
The part is SMD and how I create custom pad sizes for this element using Eagle? I've created Polygons:
but Polygon is not (SMD) PAD on a Top Layer.
A... |
H: How does async data transmission actually work?
I think I understand synchronised data transmission between A and B. They share a synchronised clock signal that indicates when the transmitter is sending a bit and the receiver should read the value.
What I don't understand is asynchronised data transmission. I reali... |
H: Estimate the value of an inductor by its steady state response
I have the following circuit:
simulate this circuit – Schematic created using CircuitLab
The duty cycle of each sw is 50% and the frequency is 160kHz, at steady state I end with the following response:
Since I now the value of R I also know the curren... |
H: Writing embedded software w/o hardware
Consider that the hardware team will take 2 months to develop some hardware, but by that time I will need to have the software ready.
My question is that how can I write the software and test it without having the hardware?
Is there any standard/s to be followed? How do you do... |
H: How to wire an AC induction motor
How do I get the ceiling fan motor below wired, and how do I enable speed control?
Our AC outlet supplies 220V, and the motor comes with a 1.5uF capacitor.
I understand I would need an h-bridge controller or something similar?
When measuring the wires, red and brown are connected, ... |
H: Why op amp behave like that?
This is a non-inverting first order low pass filter.
The cut of frequency= 1591.5 Hz
The input frequency = 264.2 Hz
The input voltage = 1.5 Vp-p Sinewave
simulate this circuit – Schematic created using CircuitLab
According to this equation:
Af = 1+ R2 / R1
Af = 2
voltage gain Av at 26... |
H: Question about the "system-block"
We're busy with a project, we are building a 'stabilized duocoper system' with two DC motors, they have to make the 'arm' stable, so when it goes more to the right the left motor has to turn more fast to make the angle zero, so that it stands vertical on the earth.
My question is, ... |
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