All Questions

0
votes
0answers
17 views

2n7000 used for inductively coupled load modulation apparently latched

So I've got a fairly basic circuit set up for load modulation of an inductively coupled circuit: A few notes on the above: LC's were designed for 1 MHz but work better at 950 kHz, thus the chosen ...
0
votes
0answers
27 views

How to lock an ATMega328P from cloning?

I was working with the Arduino IDE. I tried to find out from where a MCU can be locked so that nobody can make a clone from it. I found many answers describing something about lock bit. I realized ...
0
votes
0answers
16 views

Is it possible to measure impact force using Flexible PVDF Piezoelectric Film? [on hold]

If it is possible , should i use integrator circuit first to hold the signal then follow it by other signal processing signals (amplification and noise filtering ) ? , knowing that i tried to connect ...
0
votes
1answer
18 views

Opto-coupler (CTR) and PWM/Relays

I'm VERY confused about saturation and calculating it. As i increase the resistance of photo diode of opto-coupler (4N35) the resistance between collector and emitter increases too. How the ...
0
votes
0answers
11 views

PCB Ground Plane and Redundant Connections to Common Ground

This is a question borne of sheer ignorance, but I'm not sure if it's a good or bad thing. I'm designing a PCB (1) that will connect to another PCB (2). The latter has all of the power, ground, IO ...
0
votes
4answers
43 views

Voltage signal and Current Signal

Please give an intuitive explanation of difference between how a signal or data is carried using voltage and current? I'm wondering even though current and voltage inevitability co-exist, why do we ...
0
votes
2answers
22 views

How can I switch multiple lines using a single switch?

I am looking to make a switchbox for my 34 pin floppy drive (I know you can't hotswap) but I don't know what to use. I have heard of a multiplexer but I think it is only one way. I need to be able to ...
0
votes
0answers
21 views

Powered riser safety for dual PSU, GPU system

I am very much a novice w/ electronics. I'm trying to evaluate these risers for use in a system where I need to add additional GPUs and a 2nd PSU (the first PSU is 1600W and maxed out w/ 4 GPUs, the ...
1
vote
0answers
46 views

Powering down parts of a pcb to conserve power, is it possible? Any caveats?

I'm building a USB 2.0 bus-powered STM32F429-based audio device that is able to run in a stand-alone mode from a phone charger, or running as a USB device when connected to a computer. To comply with ...
0
votes
0answers
18 views

How to calculate error amplifier output in amplifiers

I'm trying to derive an accurate formula for the output of an error amplifier in the class D amplifier I'm simulating. Most literature on the error amplifier/integrator in class D amplifiers glosses ...
-3
votes
0answers
34 views

Bode Diagram To Transfer Function

Tomorrow I have final exam from control systems and ı am trying to solve example questions. But I am not sure about answers. Does any one explain solutions for me? Thank You.. https://ibb.co/vQcDH6X ...
-5
votes
0answers
21 views

cheap m.2 nvme ssd [on hold]

I want to buy about 1TB M.2 ssd from aliexpress.com but I am wondering that price difference Chinese ssd as compare to other brand very cheap and I'm really worried about purchase this ssd https://www....
1
vote
1answer
42 views

How to proove if any circuit have negative feedback?

Queries regarding this circuit I am able to say that this circuit has negative feedback but my procedure is disorganized I want a step wise procedure to identify the polarity of feedback In this ...
0
votes
2answers
35 views

Interrupting process in another thread

Will an interrupt defined in one thread interrupt any process in other threads? If not, how can this be done?
1
vote
0answers
27 views

Designing a two stage differential amplifier with MOSFETS

As a part of a "Test you understanding quiz" i had yesterday at school were we tested our understanding of differential amplifiers and mosfets i came across a question that asked us to design a ...
0
votes
2answers
35 views

Negative Voltage In Capacitor When + Side Is Connected To -

1 : https://i.ibb.co/B2TsFvz/1.png 2 : https://i.ibb.co/y0rrSKJ/2.png Hello, i just didn't understand that why we get negative voltage(-4.7V) from capacitor's negative pole when we apply 0V to ...
0
votes
0answers
30 views

Eagle right angle bending wire

How do I make sure wires go over the grid when drawing a schematic(Not layout) in Eagle? i.e they always bend at a right angle
1
vote
3answers
67 views

How to find input impedance of this OPAMP circuit?

Assume OPAMP to be ideal with infinite gain (a) and infinite input impedance I am clearly able to see that the input impedance of this circuit is R1 (correct me if I am wrong) but I am unable too ...
1
vote
1answer
54 views

What is this dumbbell looking symbol on this schematic? (looks like jumper pad, but with a short)

Regarding to SJ1 and SJ2 in this schematic: On the board it looks like two ordinary copper pads but with a thin connection between them. Is it meant to be a way to open the circuit by scraping off ...
0
votes
2answers
49 views

What is the series resistor doing between the power source and the power input of this IC?

This is from an Adafruit RTC module. What purpose is the R3 1k resistor serving in this circuit? Is this a RC charging circuit? Would the capacitor C1 not get any charge if the resistor wasnt there? ...
0
votes
1answer
15 views

24V 3D Printer - power ratings

I have a 3D printer at home and looking to improve some parts. The PSU on the printer has no labels so I'm not certain what it's doing - but the 3D printer's spec. sheet says it's 600W peak and it ...
0
votes
0answers
16 views

Protecting a 5.1 amplifier

Some Yamaha models have no protection at all, except a fuse, maybe. I was thinking using a GDT, MOVs plus a line filter in an external box. And maybe adding a 12v latching relay (two pushbuttons: push ...
2
votes
2answers
43 views

Shielding to Block Wi-Fi for Testing No Signal

I was trying to conduct a test recently to show that the system I am developing behaved as expected when it can't connect to the Wi-Fi network it is configured for, and then subsequently to test that ...
1
vote
2answers
42 views

Run electric motor CW & CCW with DP-DT switch

I have a Harbor Freight drill press 1-1/2 hp, running on 120 volt, capacitor start. Is it possible to run CW & CCW rotation, using a DP-DT switch? Motor has four wires coming out of it, all ...
0
votes
0answers
8 views

Eagle ULP to merge different connections on pin and pad

Currently I have a board and schematic in Eagle 7.x that are inconsistent due to a block copy. Basically, when I copied the schematic, all the net names stayed the same, but when I copied the brd, the ...
1
vote
1answer
31 views

Admittance, Conductance, Susceptance definition

Admittance is the reciprocal of impedance. But: 1) Susceptance is the reciprocal of reactance, or the imaginary part of admittance ? 2) Conductance is the reciprocal of resistance, or the real part ...
1
vote
0answers
23 views

Switching between outputs using irfz44n mosfet

In the circuit shown, the input voltage to the op-amp ua741 is 1V and the output will be 5.7V, which switches the bottom left irfz44n mosfet on and the off voltage irfz44n mosfet off. So i would ...
0
votes
2answers
47 views

LED Matrix Light Leakage

I am controlling a 6x6 matrix of LEDs using a PLC with sourcing outputs and sinking outputs (24V). However, there is an issue with current leaking through to other lights. For example, in the ...
0
votes
1answer
64 views

Is an FPGA the best tool to generate a continuous flow of square pulses with arbitrary amplitude?

I need to generate a train of rectangular pulses, with positive and negative arbitrary amplitude. Ideally, I would like to have the generation electronics connected with a computer, and I would like ...
0
votes
0answers
16 views

How to include new path in compiling qmk project

I have a running qmk project. I have used msys2 to produce the .hex file.Now I am trying to add MIDI functionality . when i add library folders such as MIDI . when I add include "midi.h" inside a ...
0
votes
0answers
21 views

FMCW radar resolution with target spectral width, non-linearity and receiver resolution

The question is about resolution of FMCW radars whcich send triangular frequency waveform, receive it's echo then mix it with sent signal, extract beat frequency. The beat frequency is proportional to ...
-1
votes
0answers
54 views

microelectronic circuit definition [on hold]

please anyone knows what is the type of this circuit I'm attaching below? I mean what's name?!
3
votes
2answers
91 views

How does this circuit work? (AM receiver)

I do not completely understand how this circuit works: First, I do not understand how the LC filter selects the frequency. I know that it's impedance is 'infinity' at the resonant frequency, but I ...
0
votes
0answers
30 views

Measure precisely a resistance value [duplicate]

Basically, I'm tasked to study the electrical properties of different screws (all in an unspecified titanium alloy, some fully anodized, others only the head) based on previous measurements that ...
5
votes
7answers
294 views

Hand soldering SMD 1206 components

Because I tried to wire-solder a protoboard which failed miserable, I'm intending to order a PCB. However, to minimize the area, I want to use some SMD1206 components. I ordered some basic ones (...
0
votes
1answer
42 views

Using higher I2C voltage then MCU supply (but still in limits)

I am working on a project where there is 1x MCU and 2x I2C devices device needs 2.8 V using I2C1 device needs 3.3 V using I2C2 (I have a need of seperating bus apart) If I understand correctly, a ...
0
votes
2answers
41 views

5v relay module not working with dc adapter [on hold]

I have a setup with a relay that disconnects mains voltage for a project.the problem i have is that the relay works fine when i connect it to the arduino and power it from a laptop but i changed the ...
0
votes
0answers
39 views

Smd Component identification

I was creating schematic from a pcb but could not understand what the component in the image is for. The name written on the component is L386. At first i thought that it is a voltage regulator like ...
-2
votes
0answers
30 views

In a conductive wire, a set of electrons with equal charge 6 C pass through a section of wire in 2 seconds [on hold]

In a conductive wire, a set of electrons with equal charge 6 C pass through a section of wire in 2 seconds. What is the value of the electric current in this wire?
0
votes
0answers
41 views

3 phase colour code, non-standard [on hold]

I have bought a Iron Air 3 phase compressor. The colours of the wires are Blue, Brown and Black. With a Green/yellow earth. No neutral. No information supplied about which colour is which phase. Can ...
0
votes
1answer
22 views

Confusion with applying incremental bandwidth to measure noise power spectral density

From a text, regarding the following paragraph about random noise: Being not very informed on this topic, I don't understand what meant by the following statement: "If such a measurement is made ...
0
votes
0answers
18 views

Synchronous Machines - Finding the required value of excitation

I am working through this question that is divided into three parts. I have no troubles with the first two parts - The answers I obtained for part 1 and part 2 is correct, however, the third part is ...
8
votes
6answers
1k views

STM Microcontroller burns every time

I have some experience working with stm32 but I only ever used them on dev boards. I recently tried to solder stm32 and stm8 on a simple break-out board and program them with my st-linkv2 clone. On ...
0
votes
1answer
43 views

What kind of force sensor mechanism I can use in measuring movement? [on hold]

I will be making a device which will be able to detect minimum movement to imply an intent of the patient moving. I was thinking, since the patient will be strapped, the strap will be connected to a ...
0
votes
3answers
69 views

Fluctuation in resistance value

I'm trying to measure the resistance of a surgical screw that seems to have a low resistance, around maybe one ohm. I use a 1908P multimeter and wires having for resistance around 0.005 ohm. Since ...
-2
votes
3answers
57 views

Voltage changing [on hold]

I'm finding a problem with changing voltage ! I will explain by example: lets assume I have a voltage source which it's 20v , connected to specific circuit, that circuit have resistor which the drop ...
-1
votes
0answers
32 views

I want to select a suitable driver for a MOSFET STF27N60M2-EP [on hold]

I want select a suitable driver for a MOSFET for STF27N60M2-EP. Data sheet for MOSFET here The switching frequency of the mosfet is 100kHZ. Please suggest mosfet drivers I should use to drive the ...
0
votes
1answer
25 views

feeding scaled down voltage to XADC (Xilinx)

simulate this circuit – Schematic created using CircuitLab I have XADC (Xilinx) with single ended voltage range of 0-1V. To regulate the output of a DC/DC converter let's say 15V i feed the ...
-4
votes
0answers
78 views

Can SRAM Explode? [on hold]

https://www.st.com/resource/en/datasheet/m48z02.pdf Can this SRAM explode if it is connected wrong? It has a button cell battery built in, and also power pins... So if for example these power pins ...
1
vote
2answers
61 views

Why such large error on opAmp in my setup?

I'm working on a device that would restore voltage on my collection of used 18650 cells. The theory is that they need to be charged extremely slowly with constant current of max 100mA until they are ...

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