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11 views

Writing on one flash memory location could affect whole memory page

I am working on designing energy meter using PIC18F46K80. When the power goes off the meter store data on the flash memory (credit and so). Meter power supply stores enough energy to supply the ...
1
vote
2answers
35 views

Constant Current Drive for LED

I am going through the circuit as shown above. In such LED drive design (constant current), I am not sure about the role of R16 (2 ohm) resistor. Is it for transistor to have less power dissipation ...
4
votes
0answers
52 views

Warming PCB in cold environment using SMD components only

I made a sensor board that needs to operate at about -55 degrees Celcius. Unfortunately, its key component often malfunctions when the circuit is cooled for days at the temperature and then powered up....
1
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0answers
12 views

lm35 Temperature Reading increasing with Hot-melt adhesive (Calculations check needed?)

I have one question with this topic: lm35 Temperature Readings are not right after sealing with Hot-melt adhesive (How mush has it Soldering max Temp toleration ?) it answered by this (Thanks from @...
0
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0answers
11 views

Altium error: “Could not find closed shape” when creating region from primitives

I have imported a dxf onto mechanical layers, and want to use this to create the pads for a component footprint. My approach is to select the whole outline of the would-be-pad on the mechanical ...
0
votes
1answer
20 views

Is NB-IoT roaming possible?

I found a comment on a blog post stating that NB-IoT doesn't support roaming: nbiot do not support roaming (you must have sim from the operator that have the infrastructure). nbiot also lacks ...
0
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0answers
15 views

Validating My Approach To Camera Synchronization

I have been in a rabbit hole for the past week trying to decide on a way to build an affordable synchronized camera array for an autonomous Go-Kart PoC. Since my background is in software development ...
0
votes
1answer
32 views

How can the dielectric constant of water be so high but water on electric devices can cause a short circuit? [on hold]

Is it only the fact that pure water has a high dielectric constant and non-pure water i.e. the water that usually causes a short circuit is contaminated and it's the contamination mixture in the water ...
0
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0answers
32 views

LM2574-5.0 Voltage Drop by 1/2 v (2.5V) instead 5V

I have a problem with an LM2574-5.0 that only gives me half ( 2.5V instead 5V) the voltage needed when loaded. I looked for a circuit on the net with good filtering, because the circuit will be ...
0
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0answers
13 views

LTC2852HDD Transceiver defect when the polarity is change

I have been unsing the above transceiver for our application. I have discover that when I turn the polarity of this device, the Transceiver does not work anymore or is defect, because taking back in ...
0
votes
0answers
13 views

Fiber bragg Grating chemical detection with laser diode

enter link description here I am building a system where the spectrum analyzer is connected to the photodtetector , this photodetector is connected to one end of the FBG 1550nm. The other end of FBG ...
2
votes
2answers
44 views

Does the distance between the signal lines (in terms of noise immunity) matter when wiring the board?

Studying the design of many boards, I noticed that the signal lines go very close to each other. A small distance between the tracks improves noise immunity or is it a matter of beauty and ...
0
votes
2answers
19 views

Arduino to PC multi-sensor device

This us for a liquid-cooled computer or server. Is it at all possible to ”daisy-chain” (possibly not the right term) multiple Arduino boards together for the following inputs? Multiple different ...
0
votes
1answer
42 views

LC CIRCUIT ISSUE

I am high school boy doing his homework on the circuit, I came across this question , I need to find maximum current that will flow in the circuit What I have tried :) It's a weird one because ...
0
votes
0answers
11 views

LPC-Link2 Not Working as CMSIS-DAP with OpenOCD

I'm working on a project with the NXP LPC824 using VisualGDB and OpenOCD. Using the LPCXpresso824-MAX dev board I had no trouble programming and debugging using OpenOCD. I am using the version of ...
0
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0answers
45 views

Why crypto ASIC miners have high wattage rating?

I was going through the specification of few crypto ASIC miner having 55 Th/s and noticed that the wattage above 3500W . The power supply is converting 230V AC to 12VDC to 3 chip boards.And the chip ...
0
votes
1answer
30 views

Is it possible to send data while receiving audio with a bluetooth module

BM64 bluetooth module supports the following profiles : A2DP 1.3, AVRCP 1.6, HFP 1.6, HSP 1.2 and SPP 1.2 Using the A2DP I can stream audio output to a speaker as it is for a sink, thus a speaker. I ...
0
votes
2answers
32 views

FET-based H-Bridge for bi-color LED

I've got a bi-color LED in a push-button that is red when powered in one direction and green in the other direction. I would like to control it from a Raspberry Pi GPIO pin, e.g. High=Red, Low=Green. ...
0
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3answers
54 views

Transistor Analysis

Here is a problem I saw as an example of transistor analysis: (hFE is 50) simulate this circuit – Schematic created using CircuitLab The process is simple, the guy assumed that the transistor ...
0
votes
0answers
19 views

Parking Light And Signal light with same LED using MOSFETS

I have a project where I have an existing 12v parking light and I want to also have the turn signal use the same light. I've constructed a circuit using 2x NMOS and 1x PMOS. I think it will work and ...
0
votes
0answers
21 views

FSM in Logisim Evolution Using VHDL

I have been trying to make a state machine work in Logisim Evolution using VHLD. All the environment in Logisim has been set up and it's working for simple VHDL examples, so I can rule that out. The ...
0
votes
1answer
35 views

PIR triggers relay without motion

simulate this circuit – Schematic created using CircuitLab I'm using a HC-SR501 PIR sensor and a 12V relay to switch between green (NO) and red (NC) on a LED strip, everything being powered by ...
0
votes
0answers
24 views

Biasing an Enhancement NMOS with Gate-Source Connected

I'm working on a university project wherein a full-wave rectifier is constructed using two enhancement mode NMOS transistors. I'm tasked with designing a biasing circuit for the NMOS', but I don't ...
0
votes
2answers
40 views

Small battery for multiple small charges

What are small batteries that can put up with lots of small charges? I get that you can't have everything in a design, so I get that it will be heavy or expensive. Imagine a RC car with some photo-...
0
votes
2answers
65 views

How to protect an op-amp against high inrush current following a high input voltage pulse?

I have a circuit where I'm amplifying the output of a piezo transducer with an op-amp. By taking some readings, i've found that the piezo can output fairly high voltages when struck hard (~20V), and ...
0
votes
1answer
61 views

ADC with small input range

All of the ADCs I found online have an input range on the order of few volts, e.g. 0 to 5 or -4 to +4. But my signal is in the mV range. Are there any ADCs with such a small input range? I know I can ...
1
vote
1answer
34 views

STM32F103CB Timer update interrupt not working

I am trying to setup the timer update interrupt of a stm32f103cb. My setup and interrupt code looks as following: ...
1
vote
1answer
71 views

optical glow fiber for low-tech communication links?

Can cheap "glow" optical fiber (or other inexpensive materials such as aquarium air tubing, etc.) be used for low-tech low-speed optical communications using just simple discrete components, such as ...
-2
votes
1answer
61 views

How to create the equivalent resistance of complex circuits?

I’m really confused what to do in these complex circuits, but I understand that i have to use Kirchoff’s law to get it , right? I just want to see the equations that made it into whole R eqv .
1
vote
1answer
46 views

IR Light Detector as MOSFET Gate

I would like to use an IR transmitter/receiver pair to detect when an object obstructs (or does not obstruct) the path between the the transmitter and receiver and illuminate an LED when the path is ...
0
votes
1answer
49 views

Designing a clipper circuit

Design a clipper circuit using 1N4148 general purpose diodes and a R = 1 kΩ to clip input signal voltages that are above 5.7 V or less than −0.7 V. Below is my schematic in which Vo<=Vdo + 5V and ...
0
votes
1answer
52 views

Why noise when increasing amplification of last cascade of transistor amplifier?

I've made small amplifier for hand-made electric guitar - it is just two transistor cascades - and I've found one curious effect when increasing amplification. Some annoying noise (just typical ...
1
vote
1answer
73 views

Will my DIY powerbank be safe? It will be charged using laptop chargers

I want to build a DIY power bank that can be powered using most types of laptop chargers. I do not have any background except personal interest and lots of videos and documents read online. I need ...
0
votes
1answer
60 views

74HC08 Quad 2 input and gate Not working

I am absolute beginner and I purchased SN74HC08 Quad 2 input AND gate . Hoping it will work as expected I connected it to the breadboard and used the 1A and 1B inputs connected to a push button and ...
2
votes
3answers
51 views

Battery charging voltage additive?

I've got a 18.5 volt battery made up of 5 3.7 volt cells (Li-Ion). For charging the datasheet for the single cells says the battery requires .5 volts more, to counteract the internal resistance, I ...
0
votes
0answers
32 views

Why does the V/Hz ratio of a motor affect the magnetic field strength?

When the frequency is increased whilst keeping the voltage constant, the magnetic field strength is going to weaken... I don't understand why and what actually happens that causes the field strength ...
0
votes
1answer
53 views

LED Matrix design without micro-controller

I am working on a project concerning the creation of a LED matrix (4 x 6) but without using a micro-controller. It will be powered by a 13V battery and the leds will be controlled by a switch. My ...
0
votes
0answers
19 views

Allen Bradley PLC 5555 IO not responding [on hold]

Don't have any idea about plc programming.anyone identify what's the issue with the tree .. the io not responding blinks and warning symbol on I/o configuration folder
0
votes
2answers
55 views

Wristband charging technique [on hold]

I was wondering how waterproof wristbands are charging. I suppose is a common technique that all vendors are using. For example my wristband has two exposed leads as it seems below. The charger has ...
3
votes
1answer
32 views

Differential low pass filter to single ended -> Differential low pass filter

I'm designing an audio DAC based on the PCM1690 from TI. Datasheet One requirement of the DAC is differential outputs. Since the PCM1690 has differential outputs, this is not a problem. However, the ...
1
vote
1answer
52 views

Video RAM: How to create a shared bus for processor and VGA controller

I have a discrete video controller which reads a image from SRAM. The image should be written by a CPU. So I designed this circuit. I use two display RAM because I want to use double buffering. So ...
0
votes
2answers
60 views

Oscilloscope and Multimeter working principle [on hold]

How do Multimeters measure voltage? How do Oscilloscopes measure voltage? Is there any difference?
-1
votes
5answers
83 views

Can the output of one logic gate serve as input to more than one subsequent logic gates?

NOT gates take one input, AND and OR gates take two inputs. But can any gate have more than one output? I've only ever seen diagrams where each logic gate has exactly one line coming out the right end....
0
votes
0answers
41 views

high current passing through mosfet is damaging the nrf52

simulate this circuit – Schematic created using CircuitLab recently trying to make a led strip that can be controlled over bluetooth. I need high currents up to 10A. for the test purposes I ...
0
votes
1answer
27 views

Get signal from apartment intercom to know when someone ring

In my apartment I have an old intercom to know when someone is at the entrance of the building and to unlock the door. I waned to connect it to an esp8266 to let me know remotely if someone ring and ...
0
votes
1answer
33 views

MOSFET simulation model

I am trying to model a synchronous buck converter, for which I need to choose mosfet models for simulations. I am seeing that it has various parameters out of which length and width is affecting the ...
0
votes
0answers
30 views

Finding gains from the summing different phases signals

I have four signal which are the same frequency and different phases. It is possible to think S1=1kHz sine,0 degree S2=1kHz sine,30 degree shifted S3=1kHz sine,60 degree shifted S4=1kHz sine,90 degree ...
4
votes
1answer
163 views

Is there anyone who understand this symbol of Jetson nano based board schematics?

I am reading schematics of Jetson nano based board, that contains some symbols I have never seen before. Is there anyone understand this symbols? you can find full schematics here: https://github.com/...
0
votes
2answers
43 views

LTSpice Simulation - How to design pulldown with voltage supply

I am trying to simulate a circuit which should pull the supply down. Problem here is, that the supply is a not current limited and the whole voltage is dropping accross the 0.1Ohm RC of Q4 and the ...
0
votes
3answers
42 views

Extending the NRF24 range / power

I have a NRF24L01 model with an included screw-on antenna and apparently also an integrated RF amplifier (something like this, image sourced from eBay seller top_electronic1980). I have a lot of ...

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