All Questions

0
votes
1answer
18 views

Circuit to tell Microcontroller when Voltage is Low

I would like to trip an input, similar to a button input to an microcontroller if the input voltage to the circuit/microcontroller is below a certain threshold. I have transistors and some zener ...
0
votes
0answers
6 views

transient protection for 0.5W laser diode switching driver

I'm some way into a project which involves switching 0.5W laser diodes at 100kHz, with a pulse of around 1us in width. I'm having issues with the diodes (which I don't have a datasheet for) failing ...
0
votes
2answers
26 views

Input and Output impedances of Current and Voltage Amplifiers

I read that Voltage Amplifier have high input impedance and low output impedance, and Current Amplifier have low input impedance and high output impedance. If this is true what is reason for this as I ...
0
votes
0answers
25 views

Operational amplifier characteristics [on hold]

What are the differences between the Open and Closed loop gain of an operational amplifier? Also, what is the concept of “feedback resistance” in amplifiers?
0
votes
3answers
25 views

Interrupt generating circuit: 0 ~ +3.3 V

For the purpose of testing a MCU and it's interrupt handling I want to design a circuit to generate interrupts. Ideally I would use a relaxation oscillator, but my supply is constrained to 0V and +3....
0
votes
2answers
20 views

Backup power supply using capacitors to help esp8266 run for 3-4 seconds after power failure

I need to make a circuit with introduction of capacitors in parallel with input supply of esp8266(3.3Vdc) to run it extra 3-4 secs after power failure, Is it possible to gain extra 3-4 secs just ...
0
votes
1answer
15 views

timer interrupt on STM32F303

I'm kind of a newbie so excuse me if this is a beginner's question. tried to find an answer but couldn't find one. I'm working on STM32f3Discovery eval board, with the stm32f303vc on it. The code ...
1
vote
3answers
41 views

Large Power System - Separate Earth Grounds?

I'm a EE working on a scientific instrument that is large in scale, like a building. The structure is all metal and will have many server cabinets and electronics equipment, motors, sensors spread all ...
0
votes
0answers
27 views

Tight Space Pin Remapping for General IC Controller Socket Design (3d Printer Main Board)

I'm currently contemplating a 3d printer main board design... I would like to minimize price and maximize reliability and re usability. Existing boards use a somewhat monolithic architecture; Usually ...
-1
votes
0answers
29 views

I'm drawing up the refrigeration system electrics for my boat [on hold]

I'm drawing up the refrigeration system electrics for my boat (day 5). I am not an avid hobbyist but I can ask my Controls PE if I really get stumped, just hate to bother him all the time. He can look ...
0
votes
0answers
42 views

Stepping down 330v dc to 5v

I want to make a transformerless power supply. So I am planning to convert 230v AC to 320V dc using bridge rectifier and step it down using chopper. But the problem is the pwm controller of the ...
-3
votes
0answers
66 views
2
votes
2answers
47 views

Is there any relationship between frequency of signal and distance it travels?

I'm currently researching 5G technology. Many videos/articles on this topic claim that 5G is designed for communicating on lower distances (than 4G), because of higher (than 4G) frequency. So to build ...
1
vote
4answers
57 views

P-Channel MOSFET Flipped on Schematic

I'm designing a circuit which has a bluefruit nrf52832 micro controller built into it. When referencing the schematic provided by Adafruit I noticed that they had +VBAT going to the drain of the p-...
1
vote
0answers
28 views

Designing an audio amplifier, problems with bandpass filter

I am trying to build a Audio amplifier for a university project, I think that most of my circuit is done but I have an issue with my filter as my sine signal is not symmetrical after filtering to ...
0
votes
1answer
15 views

How to convert lumped components to TL segments?

I have the following circuit: which I need to implement in Microstrip. For now in order to get the correct results I was using lumped capacitors. But I will need to use Microstrip stubs when ...
0
votes
0answers
27 views

How does one change Vivado IP signal types?

The Xilinx IP block called Utility Buffer allows the designer to convert one single-ended signal to a differential signal pair (among other things). However, the block expects the input and output ...
0
votes
2answers
27 views

Transformers confusion with output voltage and number of iron cores used

I have been wondering about an experiment which can help me observe that the output voltage of a transformer increases as we increase the number of cylindrical iron cores to an experimental ...
2
votes
3answers
88 views

Making a electromagnet

Can a insulated wire be used to make a electromagnet? Will there be any difference in strength of the magnet if I use an uninsulated wire instead? By uninsulated wire I mean this:
0
votes
0answers
16 views

DRV8835 - Outputs not working?

We chose DRV8835 for driving DC motors for one of our applications. We are using the N20 motors presently on both the output ports A and B. ( Here is the link to actual motor used : https://robu.in/...
0
votes
0answers
25 views

Combining non-isolated Switch Mode Power Supplies in Parallel -> into a Single Supply

I'm trying to combine several SMPS's each having an ~350VDC output @100mA each. Background: Purchased a unused batch of small DC->DC SMPS's in good industrial quality. Unfortunately they're too weak ...
1
vote
2answers
32 views

RMS power and phase angle control

We have a piece of industrial equipment using a phase angle controller (PAC), and are having some issues calculating the RMS power used by the load. Personally I am of the opinion that you measure ...
1
vote
1answer
16 views

Altium - Changing the libraries for completed schematics and PCB design

I made a design using a library (say 'All.SchLib' and 'All.PcbLib' where I have everything). Then I made libraries from the project (say 'projectA.Schlib' and 'projectA.Pcblib' which now contain only ...
0
votes
0answers
18 views

How does the hot point-probe test affect p-type semiconductors?

In an n-type semiconductor if you place a hot probe close to a cold metal probe, the average thermal velocity of electrons near the hot probe increases which leads to a net electron motion from the ...
0
votes
1answer
35 views

Traco DC DC Can I connect -Vin and -Vout

I'm using Tracopower TEL 5-1211. Can I connect both -Vin and -Vout to gnd of my design? Thanks
3
votes
3answers
282 views

Is it truly impossible to tell what a CPU is doing?

Computer programmers often recite the mantra that x86 instructions are totally opaque: Intel tells us they are doing something, but there is no hope that anyone can verify what's happening, so if the ...
-7
votes
1answer
34 views

I am looking for a low power 2.5V linear regulator. Any ideas? [on hold]

I'll try searching mouser and digikey but i was wondering if there was a frequently used 2.5 regulator with low quiescent current (preferably lower than 5mA). Input must be: Vin<10. I am in a bit ...
0
votes
1answer
45 views

ST Board works only in debug mode

https://www.st.com/en/microcontrollers-microprocessors/stm32l475vg.html I'm using that board, and the firmware runs only in Debug mode with ONLY usb connected to as a debugger. I'm using JLINK for ...
-2
votes
0answers
44 views

Solving a circuit with two power sources and three resistors, trying to find Vout [on hold]

Consider the electric circuit shown in Figure 6. Find the expression for the output voltage Vout as a function of voltages V1 and V2 and resistances R1 and R2. I just am confused about how the ...
1
vote
0answers
21 views

STM32F746 Nucleo with FMC LCD

I am configuring a new LCD screen with parallel 8080 protocol (screen controller is SSD1351). I am using ST CubeMX to generate code for FMC (attached picture of the configuration). My problem is that ...
0
votes
0answers
16 views

Building an optical mouse with stm32 µC and pmw3389 Sensor

Currently in the Process of trying to build my own USB HID mouse I bought a STM32F103C8T6, the bluepill. In addition I got an PMW3389, which I got from a partly broken mouse. However the tracking on ...
0
votes
0answers
44 views

Display sine wave on oscilloscope with avr atmega164

I want to display a sine wave on oscilloscope using AVR Atmega164, but when I put the oscilloscope on the pin OCR0A, it takes me an rectangular pulse. How can I display a sine wave? I will put my code ...
0
votes
1answer
49 views

Amplify Arduino Due DAC output

I need to drive an inductive load from an Arduino Due analog output. The analog output delivers 0.55V-2.75V (yes, it doesn't deliver 0 volts). I need to get something like 0-14V with up to 3A ...
0
votes
1answer
26 views

Field geometry of external magnetic core?

If there is a coil with an external core, would the polarization of the magnetic field inside it be the opposite of an internal core? For example, in the image: If DC current were applied to the ...
1
vote
2answers
60 views

PIC understanding the sign of the integer that is in the register

Hello I am getting current data from CANBus, they send me the value as a signed number. The problem is even if the number is supposed to be negative if(current<0) is always true and it never ...
0
votes
0answers
10 views

BQ2002, LM317 NiMH charging circuit. How to control the current output?

I have designed a charging circuit utilising the BQ2002 and LM317 for 2x 1.2V NiMH batteries, and it is to be charged using a 5V USB input, I need the output current to be between 550 mA and 1A. I ...
0
votes
1answer
22 views

Boost Converter Output Ripple Current

I am designing a boost converter with the help of this TI app note My output Load current is 300mA and output voltage is 28V. I need to calculate the output ripple current. But in the app note, no ...
0
votes
0answers
37 views

Connect an LCD salvaged from a phone to an Arduino [on hold]

I salvaged a dot matrix LCD display from an old Huawei land phone (ETS2221.) It has 20 pins. I want to know if I can use it with an Arduino. I also need a pinout diagram for it. I have intermediate ...
0
votes
0answers
18 views

Running STP and high-current AC cables together

I am about to install a backup generator about 40m away from my house. There is no question what cables to run for the AC current (which will be 230V 50Hz up to 30A) — doubled 10AWG (6mm2) to keep ...
0
votes
1answer
16 views

Atmel debugger: erase bootloader?

I have an ARM-M0+ (SAMD21G18). I have a project that has a bootloader and another with application. When I try to go to debugging I suspect the following: the ROM is erased application flashed ...
-2
votes
0answers
18 views

Schmeticc diagram of Patch GSM ANTENNA [on hold]

I am trying to design GSM module. I want to design patch antenna connection with GSM_ANT pin . Can anyone help me?
0
votes
0answers
17 views

Playback log files in can bus

I'm using MCP2515 CAN Bus controller and I'm connecting between two boards successfully. I have bough a can bus analyzer Ksaver, which allows to playback log files. I connect the logic analyzer DB9 ...
2
votes
5answers
165 views

Diode type with lowest drop voltage

I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ? Thank you
1
vote
1answer
57 views

EL Wire safety?

Electroluminscent wire is often used on party-shirts or to decorate other wearables. They come with little "EL Inverters" that run on 3-12V DC power. I measured the output voltage that's output into ...
3
votes
1answer
39 views

Calculate right leg drive integrator

My question intersects with "What does this op-amp circuit do? (part of an ECG)", but I need some more detailed clarification on the opamp integrator of this right leg drive circuit as found in the ...
1
vote
1answer
44 views

LM317 Constant Current vs Transistor Current Limiter

LM317 with Current Limiter configuration: Current limiter circuit with transistors: I am used to drive LEDs in my PCBs with LM317. However I recently came across this circuit which will cost less. ...
0
votes
0answers
10 views

PIC SMBus timeout and recovery from that timeout

Hello I am trying to communicate with 3 batteries (same kind of batteries) with SMBus and I use PIC18F26K83. There is a mux in order to solve address conflict of the same 3 batteries. My problem is ...
1
vote
2answers
75 views

Why can the energy of local computing be written as \$f^2\$,not \$v^2\$

I saw this formula in this book: Wireless Information and Power Transfer: Theory and Practice And in the formula 14.8, it said: \$f_{i,n}\$ is the CPU frequency for the nth CPU cycle required for ...
0
votes
0answers
26 views

MAX11609 - Crosstalk in Voltage Inputs

So I designed a module which can read multiple voltage and current(4-20mA) inputs. This module has been designed with the use of Max11609. After receiving the PCBs and testing them, I observed a ...
0
votes
0answers
28 views

which interface to use TBI, GMII or MII? (FPGA)

I am working with the SoC FPGA Smartfusion2 M2S010-MKR-KIT. It is intended to exchange some data between the SoC and the PC. For that reason, I aim to use Ethernet. As far as I understood, in order ...

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