All Questions

0
votes
2answers
75 views

I need some help understanding the schematics of DIY HS102 oscilloscope

I was looking on the schematics for the DIY HS102 oscilloscope by Martin Loren (http://hscope.martinloren.com/HS102-oscilloscope.html) But I'm a bit confused about the role of the ASM1117 (LDO ...
0
votes
1answer
31 views

Is it possible to implement a serial console via GDB?

Is it possible to send debugging messages from MCU to PC over SWD via GDB without interrupting the running code (ie. without using breakpoints), like we could do via UART of MCU by sacrificing 2 UART ...
0
votes
2answers
81 views

Arduino frequency measurement

I am using an ATMEGA328p to measure the frequency of a 50% duty cycle square wave in the range 2khz to 15khz. The square wave is being generated by a good quality Function Generator and I can see on ...
0
votes
0answers
27 views

reliability of li-po battery internal protector (yellow tape)

here is the battery, as its visible there is an internal circuit (protector) consist of two different ic's. i dont know any thing about this internal protector unfortunately but i read it some where ...
-1
votes
1answer
38 views

UPS is getting overloaded [on hold]

My inverter/ups power backup is getting overloaded and tripped even when the power supply is through mains. Ideas
0
votes
1answer
42 views

CAN Rx Line between STM32 and MCP2561

I discover a problem on my design, with a STM32F042K6 MCU and a MCP2561 Can Transceiver. I can send some frames on the CAN Bus but i can't receive any frames. When i put my scope probe on the CAN Rx ...
0
votes
2answers
37 views

connect pad inside component symbol

I'm trying to connect A4 to pin 5 in 6050 in the picture. When I click those with the net tool, it also connects A2, which is not what I need. If I use the delete tool and erase the junction, they ...
0
votes
0answers
15 views

ripple-borrow binary subtraction circuit

How does this patented ripple-borrow binary subtraction circuit eliminate the need for doing two-complement conversion on the input, thus saves on hardware circuit computation area and time ?
1
vote
1answer
38 views

The source free RLC series/parallel circuit

If the energy is dissipated more quickly in overdamped circuit then why it does have longest settling time?
22
votes
3answers
1k views

Why is the voltage measurement of this circuit different when the switch is on?

I built a simple circuit with two lamps and a slide switch powered by two 1.5 V batteries. When the slide switch is off, the voltage of the circuit measured by a multimeter is 3.15 V: However, ...
0
votes
1answer
30 views

Transient Response question. I want to know why during t>0, the voltage source has been short circuited?

Can anybody please explain why the voltage source has been short circuited here after the switch has been closed at t=0. Thank You.
1
vote
1answer
43 views

How to use voltage division for series-parallel circuit

We know that: A voltage divider is a simple circuit which turns a large voltage into a smaller one. Using just two series resistors and an input voltage, we can create an output voltage that is a ...
0
votes
3answers
48 views

Digital LOGIC MICROELECTRONIC

Whenever I have "input" which it could be HIGH AND LOW for example the input VIN to the CMOS INVERTER then we assume that the iput is 0 or vdd ! what's confusing me who said that high can't be VDD-VT ?...
0
votes
0answers
19 views

Why Damper diode does not solve restart issue?Connecting 100E Series resistor-solution is technically correct?

Iam ON/OFF the 3HP Motor Starter(Submersible) using 12VDC Relay(damper diode is connected)(Relay should be on for 3-6 seconds for Turn-ON the Motor then relay should be OFF) with MCU and MOSFET, it ...
0
votes
0answers
57 views

How to build a human chain detection circuit?

I've seen devices that detect a human chain. For example, they detect when 1 or more people (possibly several) hold hands to close a circuit between two distant metal objects. I've tried to find ...
0
votes
0answers
25 views

Help with following question about Muxes?

Could anybody provide help in answering this question? I'm pretty sure I should use a Kmap to analyze it but not sure how to do so.
0
votes
1answer
38 views

Opto-coupler circuit - selection of resitor

I have a circuit like below. I wanted to know how these resistance values were calculated. I wanted to use 12V/24V in place of 9V. Let me know selection of opto-coupler and resistance value.
0
votes
1answer
45 views

If I need to attach a heat sink to a planar MOSFET, to which terminal should I attach it to?

This is a newbie question on MOSFET structure. If I need a heat sink to be attached to MOSFET, it should be closer to the source of heat. Here channel is the source of heat. Hence heat sink should be ...
1
vote
1answer
26 views

What is the minimum sampling rate for QPSK or what is the bandwidth of QPSK signal?

Consider we have created a QPSK signal with a carrier frequency 100kHz. Before applying matched filter or demodulation we need to take sampls from the received signal. So what is the minimum sampling ...
1
vote
1answer
36 views

Do H-bridge configurations have any advantages over single MOSFET dc motor speed controller designs?

I’m designing a simple dc motor speed controller that only needs to be driven in one direction and I’m wondering if an H-bridge configuration would have any advantages over a single or dual MOSFET ...
0
votes
0answers
20 views

Intercom re-wiring to open door on bell pushed [on hold]

I have a normal old intercom system in my appartement building pick up the horn, can talk 2 ways at the same time. Button to push for the door to open. Now what i want to do is whenever someone rings ...
11
votes
3answers
2k views

Can it be proven that running a GPU at high temps is bad for the card?

If you continuously run your graphics card at between 80°C and 90°C (176°F and 194°F) is it actually bad for the graphics card? I.e. does it reduce the life of the card? Can this be proven? Or is it ...
0
votes
1answer
41 views

when do you need to use a power distribution block in your schematic?

So i am fairly new to industrial automation however i have noticed a trend in quite a few schematics which have more than one 3 phase motor involved and the power distribution block is always there. ...
1
vote
1answer
22 views

Uncertainty(jitter) in setup and hold calculation

In setup calculation, the launch flop is triggered by 1st edge and capture flop is triggered by next edge. And in calculation we take jitter into account only for the clock path of capture flop. There ...
0
votes
0answers
19 views

What to do if LPTIM1 used as a Timeout wakeup unit in STM32L476 takes too long to wake the MCU from Stop 2 mode for the first time?

I am using STM32L476. I want to enter the Stop 2 mode and use LPTIM1 as a Timeout wakeup unit. The code is written such that the LPTIM1 wakes up the MCU from Stop 2 mode after every second. The ...
1
vote
2answers
46 views

Question on basics of EMC

In power electronics supplies when a common mode choke is used at the supply or before a converter (say a synchronous rectifier) , does it mean the choke is used to avoid common noise coming from the ...
1
vote
3answers
66 views

Why is conduit for 120V building power metallic?

I saw wire conduit being installed in a building, and it was metallic. Wouldn't you want to use an insulating material instead? What if the live wire sheath started to fail? It would short to the ...
1
vote
0answers
12 views

Providing additional fusing for multiple motors one branch circuit

so i have a 30A disconnect available for use at a customer site for running 2 5HP motors ( at 480V) the only question i have though is if the line is sized for a 10HP motor would both the 5HP motors ...
0
votes
1answer
66 views

How do I show that this is an OR gate?

I need to go through the 4 cases where v1 and v2 are either 0V or 5V, and then use that to show the voltage value of the output, Vo is either low or high. However, I think I'm hitting a contradiction ...
1
vote
0answers
11 views

stm32cubeMX SMbus Listen Complete callback function

I am using PMM240 to manage RRC2054-2 battery, it is based on SMbus, I have questions about how to make sure the command is complete, I noticed there are library functions ...
5
votes
2answers
89 views

Ringing on SPI square wave and other SPI issues

I've just started learning this material not too long ago and need some help. I'm trying to communicate with SPI from an AD7124-4 ADC IC to an ESP32. The first problem I'm having is I'm getting a ...
0
votes
1answer
35 views

System on chip design pcb [on hold]

Is there any site where i can order a custom system on chip (with compound) project manufacturing. like this one i want to design a circuit like in electronic wrist watches, but pcbway or ...
0
votes
1answer
23 views

Clarification on interrupt triggered DMA transfer in an STM32

I'm trying to learn about DMA and its use in the STM32L4S9VI platform. One thing I'm confused about is what binds the DMA transfer to any one specific interrupt? In the below example, I'm curious ...
0
votes
0answers
24 views

Which adapter is more suitable for a pressure transducer?

For my student project, I'm going to be using a 4-20 mA and +/- 10 V output pressure transducers and the output of these sensors will be going into a DAQ system that we purchased from DEWESOFT. Along ...
1
vote
0answers
31 views

Identify an ALPS potentiometer [on hold]

This potentiometer reads between 0 and 115K as I rotate the shaft. The wedged part of the shaft is 10mm. Can anyone identify the part number?
3
votes
1answer
84 views

Zigbee PCB layout - bad signal reception

I'm using Atmel's ATMEGA256RFR2 (link) for Zigbee (802.15.4). However I could not reach more than a few meters of range between my nodes. Here is the antenna design layout and schematics I'm using, ...
1
vote
2answers
46 views

Signal leakage when volume is turned all the way down

I was hoping I could get help with a design I have breadboarded/diagrammed with regards to a low level signal still present when I have my volume pot turned all the way down. When I turn my volume ...
0
votes
0answers
14 views

Device to switch between two light with a single wall switch [migrated]

first of all, sorry about to be asking that silly and newby question, I know, it is really lame. Is there a simple device, that I can build simply, or bought, that can switch between two lights ? I ...
1
vote
1answer
25 views

Common ground b/w power supplies and analog pin for microcontroller

Referring to the schematic below, is it best practice to have the 5 V supply on the right powering the MC (arduino-esque microcontroller) share a common ground with the 24 V supply ? The 24 V supply ...
-2
votes
0answers
39 views

EE go pro watch pogo cable [on hold]

Hello I have a EE go pro watch but not the pogo 4 pin cable to charge it can one be made as EE don't have replacements that ks
1
vote
0answers
41 views

How to read data from HDD Seagate ST9300AG [on hold]

I have got an old hard disk drive Seagate ST9300AG (please see the attached photo). The hdd is very likely functional and I would need to read the contained data. Does anybody know whether some ...
3
votes
4answers
363 views

How to avoid voltage drop when using full bridge rectifier as reverse polarity protection

I found a couple of old bridge rectifiers. After reading some docs and tutorials about reverse polarity protection decided to give them a try. The problem is nobody offered a solution against the ...
2
votes
2answers
54 views

TL494/TL594 measure current with grounded load

Multiple examples of current limiting with TL494/TL594 suggest to use current sensing resistor between load(-) and GND. But I want load to be grounded. Can current sense resistor be placed above load(+...
-1
votes
1answer
66 views

What is control voltage? [on hold]

i have a motor driver, which has a control voltage (5V). I would like to ask, what is this voltage for and can i connect to it a potentiometer? Thank you in advance!
3
votes
0answers
47 views

Identifying GaAs FET Structures

I found a photo in my grandfather's effects that I believe to be of an RF GaAs FET. He was working in a GaAs FET lab at the time this photo was dated (1975). It was labeled on the back "300μm gate ...
-2
votes
0answers
44 views

Is there any device into which a high speed dongle could be plugged to create a wifi network [on hold]

I've pretty much put my question above, It's just that I can get a 4 g dongle that offers 150 Mbps download for 35 quid and it's unlocked so I could put my EE chip out of my mifi unit in it and then ...
0
votes
1answer
83 views

Resistor and power supply [on hold]

A 1.5kohm resistor has a power rating of 3.75W. if it is connected to a 24V power supply, will it be damaged? why?
0
votes
1answer
44 views

MKR Vidor 4000 Verilog tutorial

I can't find any tutorial on how to write verilog on MKR Vidor 4000. If you have done it what software do you use to synthesize, simulate and create a bit stream to the board ? Thanks,
1
vote
1answer
24 views

Parallel two TPS2115A to get a higher current output

Can i parallel two TPS2115A devices to get higher current output. A single TPS2115A power mux can only switch 2A max load. My requirement is to switch 3A load. As per the datasheet, the device has a ...
1
vote
2answers
68 views

High speed interfaces and FPGAs [on hold]

Please excuse me if my question is very naive or broad. I just wanted to get some direction. I didn't know how else to ask for help. I am working on Analog electronics and MCUs. It seems to be ...

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