All Questions

0
votes
1answer
12 views

Wheatstone Bridge Single-Element Varying

So, this book is saying that when V_B is 10V, R is 100ohms, and delta R is 0.1 ohms, The linearity error is 2.5mV - 2.49875mV = 0.00125mV. I don't quite understand where 2.5mV came from. If I use ...
0
votes
0answers
5 views

High voltage and current

I have a DC motor that needs and works nearly 400v and 20A. I chose FDL100N50 for n-channel mosfet also IXTK40P50P for p-channel mosfet. I connect a 4n35 optocupler for output of every mosfet. Are ...
2
votes
2answers
41 views

Proportional Control Balance Beam

Bit of an unorthodox question I'm sure, but I'm making a balance beam (two rotors on either end of a see saw) with proportional control, and I can't seem to get it to balance at 0. The proportional ...
1
vote
2answers
83 views

Which region is the transistor operating at?

PNP and NPN transistors in the circuit have identical Is values. Based on the PNP transistor is connected to a DC voltage source. k = 1.38064852×10-23 J/K qe = 1.60217662 ×10-19 C Is = 0.69 fA at 17°...
-1
votes
0answers
8 views

Multistage Audio amplifier with gain 175

I need to Design the audio amplifier with following specifications . I am going to design for the first time and I don't know what sort of transistor should be used how should I start . Any tips . ...
0
votes
0answers
5 views

Superposition with dependent sources

If the value of a dependent source (say CCCC) depend on the value of an independent source (say a current source). When setting the current source to 0, would that make the CCCC an open circuit (i.e. ...
0
votes
1answer
11 views

Using internal regulator DVDD pin to power up external devices

I am designing a H-Bridge PCB and using DRV8323 as the driver. This chip has a pin name DVDD which from my understanding, from the below statement, is used to ...
1
vote
1answer
86 views

Alternative wireless technology for passive RFID tags

I am working on a project where I have 3 boxes and a RFID reader (mfrc522) attached at the bottom of each box. I keep my wallet/keys/etc in these boxes and a LCD screen displays what is in each box ...
0
votes
0answers
17 views

RFID UID vs “card number” on cheap chinese cloner

I built an RFID reader using the RC522 with an arduino. It is working great and when I scan the card that came with it it tells me the following: - Card UID: C1 44 53 63 Card SAK: 08 PICCtype: ...
0
votes
1answer
46 views

Word length in a computer system

i am currently reading about memory system in computer architecture. I wanted to know, Is the word length the number of bits input to the ALU?
0
votes
2answers
42 views

How to mount four 6-wire 10V load cells on Arduino or Raspberry Pi?

I want to connect four 6-wire load cells (Tedea Huntleigh Compression & Tension Load Cell 300kg, 15V dc, IP67, product page and datasheet) into an Arduino or Raspberry Pi and get four independent ...
0
votes
0answers
24 views

Equivalent Circuit of Howland current Pump

Why is at norton circuit for Howland current pump the current source is taken as vi/R1 instead of vi/R0? Because the formula for Norton current is IL=In*(Rn/(Rl+Rn))
0
votes
1answer
69 views

Simulating a Buck converter

Im trying to simulate a buck converter done in class to see if this fits what the theory says it would be, It must receive 110 V and send to the load around 60V and 20 A, the circuit is: And with ...
-1
votes
0answers
12 views

Don't able to program ATmega2560

I have developed custom PCB based on ATmega2560 microcontroller. I'm not able to upload code to ATmega2560. I'm using USBasp programmer and ProgISP to upload hex file. Programmer and ProgISP are ...
1
vote
2answers
35 views

On a 3-terminal bench power supply (+, -, GND), are there positive and negative drivers behind each of the terminals?

In a 3-terminal power supply like this, are there individual regulators behind the positive and negative terminals? For example a LM317 on the positive and a LM337 on the negative? If not, what kind ...
-1
votes
1answer
65 views

How is this equation valid?

I am trying to understand the Howland circuit.But how is the following equation formed .Isnt it should be(vi-vo)/R
0
votes
2answers
28 views

How to calculate resistivity from this cell design?

I was wondering how/which area and distance values are calculated for a concentric 2 electrode conductivity sensor (below) when trying to calculate the bulk resistivity of a fluid. The blue is the ...
2
votes
1answer
17 views

AXI4 communication over Chip2Chip and Aurora

I am trying to exercise the communication between AXI4 master and slaves over the Chip2Chip IP core. When I have a master in one design and the slaves in the other, everything works fine - I properly ...
0
votes
1answer
86 views

Help me to understand VOOC fast charging for lithium ion batteries?

I know common VOOC charger have fast charging rate of 18W(9V/2A). But how it possible even current is only 2A. I mean 2A current have only stored charge 2000mAh(2A*1h). How changing voltage can charge ...
0
votes
0answers
49 views

Why do not we just decrease the voltage?

why do not we just decrease the voltage instead of pulling down a resistor to ground the `68k Ω' I don't know much about this so I'm just learning since the op-Amp LM324 is just checking V1 and V2 ...
0
votes
2answers
90 views

Multiple Voltages Needed - Can I Simply Cascade Power Supplies?

Electronics novice here... I hope this is a reasonable thing to ask here. I haven't "tried" anything because I'm not really having a problem. I'm just looking for guidance before I start. I am ...
0
votes
0answers
11 views

why L298N driving the motors properly on battery but not on adapter?

I am using Arduino, l298n, adapter(12v,2A) to drive the motor 12v,200rpm when I test the L298N by simply making high and low using jumpers the motor works fine but when I connect the jumper to the ...
1
vote
0answers
28 views

LTM8073 integrated DC-DC buck converter issues

I have a board with two LTM8073 "silent switcher µModule regulators" by Analog Devices/Linear Technology being used to provide two separate power supplies. This is a 10-layer dual-sided board that was ...
0
votes
0answers
12 views

Plotting bode plot, how the starting gain is in negative?

For function; \$H(jw)=10jw/((1+jw/2)*(1+jw/10)\$ To find starting gain, i did, \$20log(10)\$ which equals 20, but in matlab, it shows ...
2
votes
4answers
396 views

Conductivity sensor AC frequency

I'm trying to figure out how to determine what frequency an electrodeless conductivity sensor needs for accurate measurement. An inductive sensor consists of two wire-wound metal toroids encased in a ...
0
votes
1answer
64 views

Is my op amp nodal voltages correct?

I wondering if my assumptions are correct. For the circuit attached I assumed that Va is equal to Vb and which will be equal to Vc since the difference input voltage must be equal to zero.
0
votes
0answers
17 views

Allowing different inputs without needing to alter gain every time; a situation for a pre-amp?

The goal I am attempting to make a small diy bookshelf speaker system using 2 16ohm, 25 watt speakers and a 2x25 watt class d amplifier board. If it matters, the amplifier board is a class d amplifier....
3
votes
1answer
82 views

How do select capacitor for 400A surge currents?

I have a 220nF capacitor in a series with my surge protection circuit. As can be seen from my spice simulation, the capacitor gets a surge of current passing through it under fault conditions, and ...
0
votes
0answers
17 views

Reusing speakers from an old laptop: how to amplify them?

I would like to reuse two pair of speakers got from an old ASUS 1201T laptop. Since I don't know the specifications of the speakers, I looked in the datasheet of the Realtek ALC269 sound card and ...
1
vote
1answer
31 views

Shape of a core for use in a solenoid

I am currently designing an electromagnetic accelerator meant to accelerate a spherical nickel-plated NdFeB (neodymium) projectile along a circular tube, in a similar manner to a particle accelerator. ...
0
votes
0answers
36 views

Resistive Divider

In a nutshell, the book says However, I don't see how that's true. If I re-draw that resistive sensing part as follows: Surely, isn't it just Why do I have a minus instead of a +? EDIT: I just ...
3
votes
1answer
101 views

Moving brute-force search to FPGA

I am currently working on a scientific hobby project about computing the error detection capabilities of CRCs. Unfortunately the C++ code used for such computations has up to years of run time on ...
2
votes
1answer
88 views

Single supply op amp with input attenuator

I'm designing a guitar headphone amplifier that uses a single supply op-amp as the output stage to the headphones. I'm using a potentiometer after the final JFET stage and before the op-amps as a ...
0
votes
4answers
2k views

Is the 555 timer accurate and uniform enough for a metronome?

I would like to create a simple metronome using the ICM7555 CMOS RC timer (datasheet), but I am not sure if the pulses will be "uniform enough". The datasheet states "astable timing accuracy" of 2% /...
0
votes
1answer
25 views

8051 Open Drain Operation

While studying I ended up finding this question. Write the value (in hex) of the P1 after the execution of the code below. ...
0
votes
1answer
53 views

Class D Amp headphones grounding circuit

I am having a problem with some of the class d amps I've played with (PAM8302A), and it seems like this article here describes my problem: https://www.edn.com/design/analog/4313726/Add-headphones-to-...
3
votes
1answer
22 views

How to convert a RS-274D gerber to RS-274X

I got from a website some gerber files, I tried to have them printed, but they told me that the format is not supported and I need to convert to RS-274X. I've tried using gerbv to open the gerbers ...
-1
votes
1answer
39 views

Can a stepper motor driver run if powered using a lower voltage than its minimum voltage?

I have a stepper motor driver with input voltage(24-50 V DC) .can I use 12 DC ? what effect will under powering the motor stepper driver have? NOTE: i have stepper motor with 45 kg.cm .in practice, i ...
1
vote
1answer
88 views

Passive probe vs diffential probe

In the image: Channel 1: Drain to source voltage Channel 2: gate to source voltage Channel 3: Switch current Channel 4: Load current The image shows Vds of low side MOSFET at turn on measured with a ...
1
vote
0answers
39 views

Resonance reading Capacitance with 555 Timer in Monostable mode. Sources and cure?

I apologise in advance if this topic has already been discussed here. I am no EE and have have no choice but to ask experts to move my project forward. I am developing a Capacitive Sensor via a ...
2
votes
1answer
51 views

What is the least expensive way to build a three-bit shift register?

I'd like to build a queue of three internal bits as inexpensively as possible. Externally, the queue has two input bits and one output bit. The inputs are (dataIn) and (shift), and the output is (...
0
votes
1answer
38 views

Operating AD5780 EVAL Board Via MicroController

OK, so thanks in advance because I am new here. I am reading the AD57XX drivers here https://wiki.analog.com/resources/tools-software/uc-drivers/renesas/ad5780 and am struggling to understand how to ...
0
votes
0answers
31 views

KVL Issue - Telescopic Casocde Amplifier

Hi, my question is regarding the equation circled in red in the highlighted text above. I can't seem to understand the reasoning behind why all the transistors are included in that equation. My ...
-5
votes
1answer
83 views

explain the working of this circuit

I'm basically trying to understand how this Dc to Dc step-up converter work. please help me.[![dc-dc step-up voltage converter 1v-9v][2]][2] I need to design a DC DC step up converter using bjts. ...
3
votes
1answer
28 views

Atmega168 USART RX Interrupt does not trigger

I have been trying to get the USART RX interrupt trigger working on my ATmega168A using the tutorial here (updating my registers as per the datasheet): Tutorials I have setup the system to use a ...
0
votes
1answer
94 views

Can I use an RC network somehow to allow reading of initial values from jumpers into a micro controller?

I completed a microcontroller project but I want to add a feature where when it starts up, it can read a 4-bit value defined by on-board jumpers (jumper closed = logic low, jumper open = logic high ...
0
votes
1answer
51 views

Photodiode - circuit questions

I am a bit confused on a few things regarding photodiodes. Here are two circuits that I am referring to: or   For the second circuit the capacitor is not of importance. Here are my fundamental ...
1
vote
2answers
85 views

Firmware only runs when I press the reset button

I've created a board using the STM32F405R6T6. I am experiencing some problems: after I program the firmware onto the microcontroller, withdraw the power and reinsert, the firmware only starts to run ...
0
votes
2answers
37 views

Circuit Choices for AmpIifier Input

i have breadboarded a TDA2050 amplifier, using this schematic i get good sound intensity with a half acceptable quality. the down side is the constant noise and humming. i have found a possible ...
0
votes
0answers
22 views

Small 12V DC-Motor Non-Linear Torque vs. Current Curve

I am currently investigating a malfuction on 12V small electric motor. it is performed torque vs. current measurements on a group of samples and some of them are showing non-linear current i.e ...

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