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Designing a simple toy dashboard

I would like to make a "car dashboard" simulator as a gift for my kid. Nothing too complicated. Here are my initial thoughts, and I would like to hear your opinions - where I was wrong, what ...
vtomic85's user avatar
  • 109
0 votes
1 answer
44 views

Using MUXs to Address Multiple Devices

I am fairly new to I2C and coding in general as I am currently majoring in electrical engineering. I needed to design a board with multiple MUXs, I am using TCA9548As, that can address interchangeable ...
Beau Raley's user avatar
1 vote
1 answer
117 views

Unknown SMD component - PCB Designation question

I have a board we are trying to repair. We are unable to get any technical documents from the manufacturer, no schematic or BOM for the board. This has multiple switches, think metal dome you press ...
user388256's user avatar
0 votes
1 answer
81 views

What is inside of a typical RF transformer?

I am tempted to decap this 500 MHz transformer, but guessing the internals are typical and well-known by experts here. I don't understand why many companies don't even spec the two windings' DC ...
bobuhito's user avatar
  • 544
1 vote
1 answer
25 views

MII to SGMII to connect ETH Switch is it possible?

I want to connect MCU with parallel MII interfaces to switch ICs with SGMII interfaces in this method : The Eth SW support 8xMDI Channel and 4xSERDES(SGMII,USXGMII,5GBASE-X , ETC). I'm afraid that I ...
Knowledge's user avatar
  • 441
1 vote
2 answers
72 views

Datalogger - Multiple CAN Bus

I have around 15 CAN Bus Interfaces (not connected to each other) sending data on the bus and I want to read all the data and forward to a PC (via USB or Ethernet). I have looked into MCP2515. I will ...
lerner1225's user avatar
2 votes
1 answer
44 views

TL494 step-down converter with CC/CV [closed]

I want to build a universal charger for Li-Ion, LiFePo4, VRLA-AGM, and similar batteries (or just a power supply with CC/CV). I'll designate in advance that the maximum output voltage of the converter ...
minto's user avatar
  • 69
0 votes
1 answer
46 views

Please help me identify this IC - top marking "APKZ LS23"?

Please help me identify this IC - top marking "APKZ LS23"?
HNLinh's user avatar
  • 173
3 votes
3 answers
534 views

Schematic component

I am new and now I am trying to understand some basic schemes. My questions are: Do I understand correctly that the wave in the diagram stands for Ferrite band in this case rated at 100 Ω 100 MHz 4 A ...
Noobie's user avatar
  • 33
0 votes
0 answers
32 views

How to cover thermal vias in design spark pcb

I am trying to cover the vias on my PCB using the solder mask however when I upload the PCB to a manufacturer's website the vias are not covered. I am using DesignSpark PCB software There is a post in ...
James's user avatar
  • 1
0 votes
1 answer
46 views

3500 Watt Inverter current runaway

I have a 3500 watt inverter connected to a 400AH LiFePo4 battery (with 200A BMS) using #2 wire. I connect my RV A/C to this inverter. It will start the A/C and it blows cold air. Initially the DC ...
RHuizar's user avatar
0 votes
0 answers
37 views

PCB track widths for optimized layout for operational amplifiers

When designing a PCB track, its width, length, and stack-up can introduce inherent inductance and capacitance. These parasitic elements can significantly impact the performance of sensitive circuits, ...
Andromeda's user avatar
  • 473
0 votes
1 answer
43 views

LiFEpo4 issues and concern

I have a 200AH LiFEpo4 battery and I bought an inverter, my inverter has 4 output AC socket if I connected the 1st socket to airconditioneer and and the 2nd socket to the charger continue charging ...
LOVE-LIGHT LIFE's user avatar
-2 votes
0 answers
28 views

Question about reputation [migrated]

I'm very new here so I have zero reputation. I created a profile as I needed to in order to make comments/ask questions. I found a post on the exact same question I have but there hasn't been an ...
user388256's user avatar
4 votes
1 answer
349 views

What does this mean in RISC-V opcode table

I want to check my understanding of how the imm[20|10:1|11|19:12] specifies the bit arrangements in the JAL (jump and link) instruction in RISC-V architecture? I ...
David777's user avatar
  • 1,555
1 vote
1 answer
29 views

5 Pin Equivalent of MT-30 Connector [closed]

Normally I connect 2 different harnesses with 3 wires together with MT-30 connector, but I need to add 2 more wires and increase the number of wires to 5. I am looking for a 5 pin equivalent of the MT-...
Bowman's user avatar
  • 349
0 votes
1 answer
50 views

Need help to identify an SSD Voltage regulator

I'm trying to get my data back from my dead SSD, I found a short on the voltage regulator that become very hot when putting the power but I can't identify the part and get the datasheet. Here is a a ...
Nicolas Twisty Pecou's user avatar
0 votes
1 answer
67 views

Where should the base resistor be placed in a PNP switch?

I would like to understand the difference between placing a base resistor at R2 versus R4 when implementing a PNP switch. It seems there is no difference whether I place a 4.7K resistor at R2 and ...
BOB_Engineer's user avatar
0 votes
0 answers
94 views

Getting 12 V from original 20 V of PSU in Vintage Arcade Cabinet

I have an old Italian Arcade Cabinet which is a clone of Atari Scramble. The game name is Explorer and was made by sidam. I am in the process of adapting this pre jamma cab to jamma so to use a ...
Chris Nuvoli's user avatar
1 vote
3 answers
50 views

How do I generate a trigger signal from a periodic analog signal having varying amplitude [closed]

I have an analog signal detecting a periodic vibration of low frequency (<100Hz) and want to generate a pulse whenever the signal crosses a certain threshold. The challenge is that the amplitude of ...
bosie's user avatar
  • 11
4 votes
2 answers
916 views

Why does IPC 2221 require so much more spacing at elevation?

In the IPC 2221 is a table that specifies the required trace spacing. One thing that I find very surprising is the jump once the elevation is above 3050m. E.g. For an external conductor (uncoated) at ...
Lucas's user avatar
  • 525
0 votes
0 answers
50 views

Design a controller using root locus technique

Given the system described by the transfer function $$P(s)=10/(s^2 +1)$$ Design a controller using root locus technique so that: The closed loop system is of first type and $$|e_1|<=0.01$$ The ...
Gabriele's user avatar
0 votes
0 answers
41 views

How to solve the problem and what is the main problem in DC to DC converter [closed]

I want to make a DC to DC converter using optocoupler BJT and MOSFET. Firstly use RC coupling circuit, then the output goes to MOSFET. in that case everything is alright. But when I add optocoupler ...
Hasibul Hassan Mobin's user avatar
0 votes
1 answer
60 views

Stop Mode 2 (deep sleep) doesn't work with STM32l053R8T6 MCU

I am working with my custom PCB with STM32L053R8T6. My code works just fine when I run it in debug without any stop mode (deep sleep). It enters to the RTC and button interrupts perfectly. However, ...
Nicat Ali's user avatar
2 votes
1 answer
52 views

I am Seeking Help to Adjust DC Motor Simulation Parameters in LTspice for Accurate Current Modeling

I'm relatively new to LTspice and motor diagnostics, but I have managed to build a PWM-MOSFET control circuit for a DC motor. My goal is to simulate this project to evaluate potential ripple currents ...
Mark's user avatar
  • 63
1 vote
1 answer
85 views

How to create a 400 MHz synced clock from 1200 MHz in Verilog?

I'm trying to generate a 400 MHz synced clock from 1200 MHz. ...
Carter's user avatar
  • 619
-1 votes
2 answers
62 views

LTspice simulating varying capacitance in cap-to-voltage simulation [closed]

I am interested in simulating the increasing output voltage and the end of this circuit when the parameter C1, changes according to a list of increasing capacitance values. So far I have managed to ...
Mina's user avatar
  • 11
4 votes
2 answers
213 views

TTL to RS485 converter problems

I have designed a custom PCB that incorporates a circuit for an RS485 to TTL converter. Previously, I successfully used a module (https://protosupplies.com/product/scm-ttl-to-rs-485-interface-module/) ...
priya's user avatar
  • 51
4 votes
1 answer
180 views

Chip identification, SOP-4, "HPTD"

Anyone know what this chip is? The dimensions are approx 4mm by 2.5mm. Also I believe one of the pins is connected to Vout of a voltage regulator. Could it be a voltage detector?
Cillantro's user avatar
  • 129
2 votes
0 answers
33 views

rs485/modbus issue

I am trying to enable modbus RTU communication between 2 inverters. Both are set up with unique IDs, 9600Hz, 1 stop bit, No parity bit. I can communicate with 1 at a time, as shown below in the ...
fruit salad's user avatar
0 votes
0 answers
32 views

please identify this 6 - pins smd with code DBXCLC [closed]

I can't find anything with mach a 6 pin smd chip marked DBXCLC. It shoud be a part of buck converter step down or dc to dc converter with 12Volt output (input 30 - 45 volt). I'm looking for a ...
Antonello Caraceni's user avatar
1 vote
0 answers
29 views

Problem on 5l0380R [closed]

I have a sat recever with this power supply. All rectifier diodes burn and replace them and also 5l0380 R was burned and I change it with a new one but it burn. I checked all components around it and ...
mehryar bushehr's user avatar
-2 votes
1 answer
66 views

Transmitter parasitic drainage [closed]

I have a RF cordless calling/alarm bell which works on batteries. The receiver works with 3x AA batteries and its transmitter works with a 23A (12v) battery. The product works with their function. The ...
Kokachi's user avatar
  • 690
0 votes
0 answers
41 views

Explination for arcing noise coming from protected power tap devices?

For years now there has been a random occurrence that happens with seemingly any power tap device I have with protection circuitry in it where it will make a audible buzzing/arcing sound for a few ...
Jacob Jewett's user avatar
0 votes
1 answer
71 views

Please help me identify this IC - top marking "CEK"?

Please help me identify this IC - top marking "CEK" such as picture below:
HNLinh's user avatar
  • 173
1 vote
1 answer
58 views

How does the leakage inductor distribute over multiple coupled inductors?

I am working in LTspice with a triple coupled magnetic inductor. I chose the factor of coupling to be 90%. L_1 is 1000uH so the uncoupled energy should be 100uH. How does the 100uH energy distribute ...
i33SoDA's user avatar
  • 103
1 vote
1 answer
33 views

Load cycler circuit analysis

Hello I am attempting to build a simple load cycler that will charge and discharge 3.7 V 18650 batteries for a certain number of cycles. I would like to program it to do something like this: I'm not ...
risa's user avatar
  • 11
0 votes
0 answers
39 views

IR2104 driver for 7 A motors

I'm currently working on a driver board for a pair of small FIT0185 motors with a nominal current draw of 0.35 A and a stall current of 7 A. I've opted to make two H bridges using four IR2104 mosfet ...
hdaniu's user avatar
  • 31
0 votes
1 answer
45 views

Buffering Arduino SPI bus using 74AHCT125

My SPI bus has 2 slaves, one is 5V tolerant and is connected normally to the bus, however the second one is only 3V3 tolerant and so I have to level shift it. I have decided to use the 74AHCT125 ...
zoghii's user avatar
  • 177
1 vote
1 answer
69 views

Can anone identify this IC marked `55JT`?

Please help me identify the IC pictured below:
HNLinh's user avatar
  • 173
1 vote
0 answers
42 views

Find v(s) in the circuit below(voltage through the capacitor)

Capacitor initial conditions = 10v, inductor = 2A. Input is the current font.Find voltage through the capacitor I think i got it but i have no clue whether its right or not, would like to know what i ...
Romulo Mendes de Souza's user avatar
-5 votes
0 answers
67 views

URGENT URGENT HELP PLEASE [closed]

I have a question i hava a Dixon 8 channel pro mixer amplifier want to know the diode is a KBU1006 is there a more compatable stronger diode or not I[enter image description here][1]m thinking to by ...
IAN's user avatar
  • 1
0 votes
1 answer
81 views

Can someone identify this electrical connector?

Can someone identify this electrical connector? It's a 2 pin DC connector. It's also "keyed" with a small bump on the flat spot. It's part of a battery charing port of my son "Backfire&...
Rick Ogg's user avatar
1 vote
2 answers
108 views

How can the power of an oscillator be calculated?

I am designing a hartley oscillator and would like to know how much power it consumes. How can I figure out how much power the hartley oscillator consumes mathematically? edit: I meant mathematically ...
xcaliber99's user avatar
0 votes
0 answers
49 views

Options after breaking USB-C jack off of PCB

Hello! Snapped the USB-C jack off of my Logitech MX Keys. I have a background in computer engineering and some experience doing board-level repairs. I do have an SMD hotplate, multiple soldering ...
Mikey's user avatar
  • 1
0 votes
1 answer
46 views

How to calculate the PLL sweep time?

How can I calculate the sweep time of a PLL for a given bandwidth and a frequency span and setted step? Let say: Span 30MHz Bandwidth 30KHz Steps 200KHz Edit: So lets say we want to sweep from a start ...
Tintin's user avatar
  • 75
0 votes
0 answers
54 views

Regarding the voltage in the resonant circuit of a Class F amplifier

When checking the operation, the secondary resonant circuit discharges. When I checked with ADS, I confirmed that the voltage was not high enough to cause a discharge at 150V or less. Regarding the ...
kimura's user avatar
  • 9
0 votes
0 answers
60 views

how do you accurately measure power consumption of a microcontroller?

I am using a microcontroller and would like to know if there is an easy way to determine the total power consumed by it? edit: I am planning to use a microcontroller for sensing an input from a ...
the_circuit's user avatar
0 votes
0 answers
22 views

Digital Dice Roller [closed]

I am working on a project to create a Digital Dice Roller. Below is the suggested component connection to implement the circuit diagram. However, I am confused start as my background is not in ...
Yerfdog's user avatar
-1 votes
0 answers
51 views

Is EVERY time we power on the computer verified that nothing have been tampered via PUF CRP authentication? By which component? Where are CRPs stored? [closed]

Are PUFs used, EVERY time we power on the computer, to verify that nothing have been tampered (by using CRP authentication)? Which element performs this authentication? (bios, secureboot, I don't know)...
allexj's user avatar
  • 53

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