All Questions

0
votes
0answers
41 views

IC for audio amplification of 3W and 4Ohms 2 speakers with Raspberry Pi

I was using a PAM8403 amplifier with Raspberry Pi to run 3W 4Ohms 2 speakers but the sound is low. So I am thinking of building an amplifier circuit. Sound low means when I connected this to mobile ...
1
vote
0answers
90 views

What will be small signal trans resistance gain of shown circuit?

Take beta = 99. I analysed this circuit using first considering this circuit as feedback circuit with shunt-shunt type of feedback and then did the same analysis considering that the circuit is a ...
0
votes
0answers
16 views

Using use the STM32F103C8T6 board with the Arduino [migrated]

last two days I am trying to programm my blue pill with arduino ide, helplessly... Actually, I managed to install simple blink program, but after that, all other attempts ended up with: ...
0
votes
0answers
27 views

USB C Alt Mode Display Port and PD able to share? [on hold]

So I'm trying to figure out if it is possible to share both charging Power Delivery AND the Display Port signal over one USB C cable at the same time? There seems to be a complete lack of adaptors/...
-2
votes
1answer
54 views

STM32 Usart Forwarding [on hold]

Please I cant figure it out this whole week about How to program a usart forwarding function in Atolic for Stm32. The function is like Aduino IDE's "uart2.write(uart1.read());" for Stm32 with Atolic ...
0
votes
0answers
70 views

Convert linear voltage to PWM

I'm trying to convert a linear voltage to a 21kHz PWM signal using passive and active components. Do you have any idea how I can achieve this ? I tought about comparing my linear voltage to a ...
0
votes
0answers
17 views

How to replay back data to a can bus [on hold]

I'm having a text file with log data that has can bus messages. I would like to know a way of transmitting a stream of these CAN bus messages to the CAN board. Unfortunately, I'm using KVASER with ...
-6
votes
0answers
29 views

What is the Formula for calculating current value from analog to digital conveter digital output? [on hold]

Example: I am using 12bit ADC and output value from the ADC is 0x9f. What is the formula to calculate the corresponding analog value for current? Can anybody tell me the right way calculate the value?
0
votes
0answers
36 views

Over Curent protection for multiple consumers

While designing a light fixture I came across an issue. The fixture is powered by a single ACDC unit that generates 24V. The fixture has around 50 LED elements that are connected to the power source. ...
0
votes
4answers
88 views

Volume risk in an electricity market

I have been reading lately about electricity markets and I have stumbled upon the term "volume risk". Volume risk is often used to denote the phenomenon whereby electricity market participants ...
-5
votes
0answers
29 views

qi chargers stop working [on hold]

I have a cheap Qi charger I bought 5 years ago and it still works fine. I have bought two Qi charges from amazon over the last two months for my daughter and both stopped working within weeks. I ...
-5
votes
0answers
87 views

Build error with PIC programming [on hold]

I am self-learning with the help of a book, and whole code comes from that book. The problem appears when I push F11+Shift. There are some messages shown below. Because I am a beginner, I have no ...
0
votes
0answers
35 views

Effects of changing the width of transistors

Looking at the figure attached, I want to understand how does increasing x, affect the noise margin of the gate [i.e. (High noise margin) & (Low Noise Margin)]? Also, how does increasing x affect ...
-2
votes
1answer
34 views

Ubuntu Battery Check [on hold]

Today morning my laptop wasn't turning on but charging light was on.later some how i able to turn on my laptop.Can be this Battery Problem? Bc i put it on charging for hour. Here is stat.
1
vote
0answers
41 views

Li battery charger reference voltage problem

schematic datasheet I have designed a battery charging circuit for a lithium ion battery.When i connect a battery the charging IC seems to do nothing. Only when i use a multimeter probe to measure ...
0
votes
0answers
30 views

Is it possible to assign a value to a signal in a systemverilog assertion? [on hold]

I have two sequences, s1 and s2. I have a property that checks these two sequences. for example, ...
-3
votes
1answer
52 views

How do I reduce amps in a DC circuit? [duplicate]

I'm trying to replace my AC adapter with a battery. The AC adapter output is 12v @ 500mA DC. I can get a 12v battery, but I can't find one that outputs exactly 500mA. I'm trying to power a strip of ...
0
votes
1answer
25 views

NMOS find relations between input and output voltage

Can I ask for DC analysis of the circuit to find relations between input and output voltage as shown in the picture ?? I know how to handle with MOSFET but I havent' done anything with NMOS.
0
votes
2answers
36 views

Batteries connection for 3 wheel e-bike

Goodday. I need info on this. If i connect say 3 x 12 volt 28amp batteries in parallel to increase the amp hour that makes it a big 12 volt battery and then connect 2 x 24 volt but lower in amps ...
0
votes
1answer
24 views

AC EMI filter specification

I am looking at the specifications of an EMI filter for single a phase ac application, and I noted that the datasheet specifies an operating frequency from DC-400Hz? Do you have any idea of what this ...
0
votes
1answer
58 views

Where do I start to look for an automatic off feature on a circuit? (Guidance) [on hold]

My child has a light up toy that turns off after 20 minutes and she likes it all night when she’s sleeping. I’m trying to figure out where to start looking among the circuit for the automatic off ...
0
votes
0answers
41 views

CRT TV severe geometry issue [on hold]

I just got a Sony trinitron wega KV-34XBR970. I heard these flatscreen crts were supposed to have geometry issues but this is a bit excessive. It seems to droop down on both sides and all of the edge/...
2
votes
3answers
52 views

Infrared Receiver - Simple questions regarding data sheet and basic electronics

I've purchased a 36 kHz IR receiver (TSOP38436) but I'm still learning about electronics and I'm not sure how to connect this to my micro controller (Arduino). (Also, I'm using 36 kHz instead of the ...
0
votes
0answers
42 views

CRC in CAN Messages

I would like to know the difference between CRC calculation in CAN physical layer vs CRC calculation in the application layer. How does the CRC calculation in these layers affect the ASIL (Automobile ...
0
votes
3answers
87 views

Why does my Inverter overload?

I have a battery pack consisting of 4 10 amp-hour 12 volt batteries wired in parallel. We recently bought a 2000 Watt rated HammerDown power inverter to run a 500 watt window air conditioner. The air ...
0
votes
3answers
145 views

Why are THP 1/2W resistors bigger than 1/4W while 1206 resistors are all equal?

How come THM (through hole mounting) 1/2 W resistors are bigger than their 1/4 W or 1/8 W counterparts, while SMD 1206 1/2 W and 1/8 W resistors are equally sized?
0
votes
1answer
43 views

Lattice Diamond Port 'direction' is unconnected

I am following the tutorial to turn on the LED on the embedded vision development kit found in: C:\lscc\diamond\3.10_x64\docs\tutorial\Diamond_tutorial\Ledtest.v ...
1
vote
2answers
72 views

Design of a low cost/low power Isolated AC/DC SMPS

I am looking to replace a classic 50Hz transformer/rectifier circuit with an SMPS. The input is to be 230VAC (EU) compliant and the output should be 5V/0.2A minimum while 5V/0.5A is a nice to have. ...
0
votes
0answers
32 views

Wemos D1 mini doesn't boot with common ground with PZEM-004t

I'm experimenting with Wemos D1 mini and PZEM-004t to monitor my home electricity, but I'm having a strange issue. I'm trying to supply PZEM-004t independently from a Wemos with a dedicated AC/DC 5V/0....
0
votes
2answers
41 views

Female 4 pin fan header

While male 4 pin fan headers are plentiful (e.g., here), I can't find a female version of it. I see lots of them on fan extension cables, but none that can be soldered to a PCB. Does anyone know a ...
0
votes
0answers
24 views

Where does the (even-mode) interference come from?

I have a question regarding the differential connection of a surface acoustic wave (SAW) delay line element. When I connect the filter asymmetrically, i.e. at each port one half of the interdigital ...
0
votes
1answer
60 views

How to find voltage gain of below analog circuit without using Nodal analysis?

This is a theoretical circuit just made to see that if I can find voltage gain of circuit and it took me much calculations then anticipated to get voltage gain.I just want to find if there is better ...
0
votes
2answers
48 views

Transitioning between 90 and 100 ohm diff pairs using coupling caps?

I'm building a PCB carrier for an FPGA SoM. The SoM has 100 ohm diff pairs routed for all the high speed IO. I'm implementing USB 3 on the carrier so should be routing 90 ohm diff pairs. What is the ...
0
votes
1answer
49 views

Floating neutral in TN-S or TN-C-S earthing system

Since neutral is bonded to ground at building distribution point in a TN-S or TN-C-S earthing system, could floating neutral happen under the following conditions: Loss of N and/or PE at transformer ...
1
vote
1answer
73 views

what if the two wires of a single twisted pair are different in length?

For example, one wire of a twisted pair is longer than the other wire (imbalance starts from the middle of the twisted pair, everything is balanced before the middle point). What problems will it ...
0
votes
1answer
72 views

Build a circuit so that you can determine the I-V curve of a diode

The question I have is: how can I design a circuit so that I can determine the I-V curve of a diode. I've found this one: But is that a smart circuit or can I find a better one? Thanks for any ...
1
vote
0answers
29 views

EMI filtering on multi-FFC assembly

an aspiring electronics engineer here. I do some electronics design for work and I'd like to know the following: If I have an assembly of a main board, to which an FFC cable connects into a second ...
12
votes
2answers
2k views

Is there a difference between an NFC and RFID chip?

The other day, my friend said that he wants to write an app that uses the NFC chip on a phone to read pet microchips. I told him I was pretty sure that pet microchips don't use NFC, but he said he was ...
0
votes
0answers
27 views

wiring diagram for USB-C to USB-mini cable

I want to create a cable that is USB-C on one end (from a Macbook Pro) and mini-USB on the other (to an external keyboard). Does anyone have a wiring diagram that could help? I read the question ...
0
votes
1answer
63 views

Autotransformer vs Inductive Divider

Which is the advantage of using an autotransformer instead of a simple inductive divider?
2
votes
1answer
57 views

Radar and Standing Waves

I have a doubt about the working principle of a simple Radar. Consider a stationary object, which does not move with respect to our transmitter. We send an electromagnetic wave to it, and it will ...
2
votes
0answers
48 views

Humming and voltage drop on p channel Mosfet

I am designing a high side switch using P-Mosfet to drive a heat element. The Mosfet is driven by PWM from MCU, which in the test is around 40Hz, 10% duty. Here is the schematic I am testing. I am ...
0
votes
1answer
76 views

LM337 voltage regulator outputs different voltage than calculated

I am using an LM337 to keep voltage stable at 3V from a battery supply (4x AAA). I've calculated R1 and R2 from the formula to be 100 Ohms and 140 Ohms respectively: ...
8
votes
1answer
133 views

Big discrepancy between theoretical and actual power through my pulse generator

I am trying to acquire some skills about pulse generation, but that's not easy. I've tried to derive the power dissipated by the input resistor in my pulse generator, but it turns out to be much ...
0
votes
1answer
52 views

Excessive Ground-Loop/Discontinuity?

I am designing PCB2 & PCB3 but PCB1 & PCB4 are set in stone. My constraints are as follows: 1) The PMIC must be the 1st device to become alive. 2) As much as I would love to, I cannot use the ...
-2
votes
0answers
31 views

Differential amplifier basics

I an differential amplifier whether, inputs are out of phase or outputs or out of phase , Please explain I think the inputs must be in phase to get the difference of each other? Thanks in advance
0
votes
1answer
41 views

Lead-acid battery charging fixed current stage specification

This post doesn't question the charging process or its theory. I seek to understand how to read the battery manufacturer's requirement of fixed current stage. They prescribe a current to be held at ...
0
votes
0answers
46 views

PCB Ground Plane on Two Layer High Signal Density Board

To give an overview of the design. I am creating a PCB with a header connection for raspberry pi that will use RPI I2C capabilities and GPIO to control board mounted integrated circuits whose outputs ...
0
votes
2answers
57 views

Cat6 Ethernet connections

I have been trying to create my own CAT6 cable lengths, but have been having problems with achieving a connection. Every diagram that I have seen online doesn't match my wires exactly. I have an ...
0
votes
1answer
33 views

Direct coupling Biasing of Two stage amp

General question. I see a lot of two stage amplifiers with a diff pair input and a cs second stage. In IC design these two stages are always directly coupled ie. the dc bias of the second stage is fed ...

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