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16 views

Arduino lack of accuracy in AD conversion

let's consider this simple piece of code: void setup() { Serial.begin (9600); } void loop() { int code = analogRead (A2); double voltage voltage = code *5/1024; Serial.print("...
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0answers
9 views

Rc filter to ground

On one of the machines I'm working on we have a cabinet that ties parallel resistors and capacitors to a machine ground. The cabinet is in parallel with the machine's main transformer and the ...
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0answers
11 views

Problem calculating fuses

I am calculating a fuse and I'm having a bit of trouble. I have a 12v 2A power supply that I want to protect, so my first thought was to place a fast 250v 2.5A fuse in series so it should blow if a ...
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0answers
13 views

Why does continued fraction expansion work?

While checking whether the given polynomial is Hurwitz or not, we perform continued fraction expansion. We were taught how to perform this check(i.e) look at the sign of the coefficients of the ...
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1answer
57 views

Do I really need to learn how to use registers - Programming a microcontroller?

I have a curious question. Do I really need to learn how to use registers when I program a microcontroller? I have been using Arduino for a long time. I quit using Arduino and starting to use STM32 ...
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0answers
22 views

Both 12v power outlets don’t work [on hold]

I just bought an older VW Jetta. Neither power outlets work so obviously I went and changed the fuses. Nothing happened. In fact I couldn’t get the 30A fuse into where it was supposed to go based on ...
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0answers
23 views

Designing Mic with integrated preamplifier

I would like to design from scratch a battery powered large diaphragm mic with integrated opamp preamplifier to 3.5mm line out jack for pc. I have two capsules. One from a t.bone sc400 and one RK-47....
1
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2answers
52 views

Can I use individual strands in cat5 or cat6 solid core wire for pcb mods / jumper / repairs?

I have a small PCB repair I need to make. I am reading that wire-warp is a suitable option. I don't have any wire wrap, but I do have tons of cat5 and cat6 solid core wire. I was thinking about ...
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0answers
20 views

Circuit that acts like a NO DPST relay, but only allows switching back to closed when a reset button is pushed

I have a water pump in my van that is activated by a DPST relay when a water level switch in a water container closes. When I drive the van, the water in the tank will slosh around causing the water ...
0
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1answer
46 views

Is writing in FeRAM memory cell destructive?

I have read that writing in Ferroelectric random access memory is not destructive. But in a WL||PL memory architecture, if I try to write a '0' in a cell and the adjacent cell holds a '1', shouldn't ...
0
votes
1answer
19 views

Why do LF RFID tags use near field and why is reading distance longer with UHF RFID?

Why do LF/HF RFID tags use the near field (magnetic coupling) and not the far field? Well, I guess it's easier. The two antennas can just be modeled as a "transformer" and power transfer is straight ...
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0answers
13 views

External Current Sourcing Sensor parallel to PNP BJT

I have Biased the transistor Q1 in active region as shown in the following diagram. I have Sensor which outputs 1-10ma and needs to be connected across parallel as per the following diagram. the ...
1
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2answers
50 views

What does an U244B IC’s input voltage do?

I’m new to electronics and I’m trying to connect a U244B ic on a breadboard. One pin says it’s an input voltage (pin 7). It works without anything being connected to the input and with battery ...
1
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0answers
35 views

Components calculations for this circuit. Is my reasoning right?

In order to review some concepts, I decided to solve the circuit below that I found. It looks like a homework, but actually it's something I'm doing by my own. Below the circuit you can check my ...
0
votes
1answer
29 views

What the R value to this operational amplifier isn't saturated?

In the following circuit, the three ideal operational amplifiers are polarized such that their saturation voltages are ± 20 VDC. The other components of the circuit are resistors, one of them being ...
1
vote
4answers
56 views

Can a DC brushless motor produce the same torque at different power levels?

I am looking these Neo Brushless motors for a project. Here are the links to the data sheet and also to stall testing from the company: http://www.revrobotics.com/neo-brushless-motor-locked-rotor-...
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3answers
49 views

Why use a concave vs. flat mating target for pogo pins?

I'm doing some research into using spring-loaded pogo pin connectors with a mating target for a project I'm working on. During this research, I discovered that there is a concave mating target, yet, I ...
-1
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1answer
39 views

MicroPython or CircuitPython on Microchip Microcontroller PIC32 [on hold]

Does anyone know if you can run python on PIC32 microcontrollers?
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1answer
21 views

Driving a TC4428 using PC817

I want to drive a mosfet using a mosfet-driver (TC4428). The frequency of turning on-off of mosfet is 5-10 Hz (yes Hz) and duty cycle is 10-20%. I use PC817 as ...
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0answers
26 views

48 Device Communication

What is the best method for interfacing with 48 different parallel devices? Each device has its own serial number that is sent out a serial data stream once when first powered up and then every 15 ...
1
vote
1answer
27 views

Best way to power 2 motors with 1 power supply?

I have 2 identical DC motors rated at 12 volts each. I also have a 12-volt power supply. If I put these in parallel, would the motors draw their required current, or is it limited to the current drawn ...
1
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1answer
49 views

Window comparator diode direction

What happens if we reverse the configuration of diode in window comparator? Will it remain a window comparator?
0
votes
1answer
23 views

AC Load Detection with auxiliary power supply

Is it possible to detect a load in an a.c. circuit before switching the main power supply supply on? Perhaps by using an auxiliary circuit which has it's own power supply, like a multimeter?
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2answers
55 views

AGND VS DGND on PCB?

Could someone please tell me the difference between analog ground and digital ground on pcb? It would be easier if you explained it with a example!
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2answers
25 views

ic to drive either one pwm signal or another

I have an existing RC circuit for a toy truck. Obviously it already has its own mC to receive the antenna signal and output a PWM signal to a motor driver IC. I want to be able to ALSO control this ...
2
votes
0answers
44 views

Confused about zero component orientation

I always thought that component orientation in EDA tools (IPC-7351) is separate from component orientation on tape (EIA-481). This made total sense to me: first, PCB design defines rotation relative ...
0
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2answers
37 views

Trying to measure start current of a DC motor

I have an 12V DV electric winch I am attempting to power with a power supply. I am only pulling about 150 lbs and I want to know what the... Start up current Running current The winch starts and ...
1
vote
1answer
25 views

How to calculate output of TEG

I am working on a personal side project and trying to learn what I can about electrical engineering as I progress. I want to use the CP60231H TEG/TEC but I need to calculate it's potential output ...
1
vote
1answer
21 views

Graph theory for Networks

To use the formula, [Bf][Zb][Bf'][I] = [Bf][Zb][Is] - [Bf][Vs] for the concerned, or any tree, should [Vs] and [Is], be written with respect to the directed tree I've taken, or with respect to the ...
2
votes
1answer
39 views

Filter before or after switching regulator?

I will be passing a power line (12V-60Vdc depending on the circumstance) with a lot of noise, 300Hz and above, riding on it through a buck regulator. I want to remove this noise with a filter. I don't ...
0
votes
1answer
42 views

Multimode cavity resonator

From my previous posts Insight into cavity resonators, Visual understanding of EM fields within a rectangular metal container I have slowly gained a better insight into cavity resonators and thereof. ...
0
votes
2answers
67 views

Is there a double power switch that guarantees that whenever A is on then B is on too (with slight time margin for safety)?

I want to completely cut power to a solar charging setup sometimes, to prevent even the background power draw of the solar charge controller itself from consuming battery charge. Charge controllers ...
1
vote
2answers
45 views

Capacitor Negative Current Flow

I have a basic quesiton about circuit theory in general. Consider the following circuit: I understand that the resistor will have a constant voltage of 1V across it as it takes the DC component of ...
0
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2answers
32 views

Voltage divider in parallel with DC motor driven by H-Bridge: can someone explain me this circuit?

I have a battery powered device with a PCB wich control a small DC motor (3V). With a little bit of "reverse engineering" I darw this schematic: So there's an 8-bit IC (STM8L052C6) that drive the ...
1
vote
2answers
36 views

Load, then add in assembly

Im trying to load 2 values in assembly under the tm4c1294ntpcd (Cortex M4) then add it with the next code ...
0
votes
1answer
41 views

Can anybody explain how the inverter circuit works?

If transistor is just like a switch, it shouldn't affect the led since it forms a closed loop with the battery. So why does the led turn on and off? I am new to digital electronics(and electronics ...
2
votes
0answers
41 views

Get position along electric wire [on hold]

Do you know the game called Buzzwire where the aim is to guide the grip mounted loop through the wire maze without touching the loop against the metal maze all the way to the end? is it possible to ...
0
votes
0answers
18 views

How to calculate Pulse width using TIMER in Capture Mode

i am trying to implement Atmel example about using TIMER0 Capture Mode to measure duty and frequency, you can find the full example at Github At (CCA ISR) we have the following code: ...
1
vote
0answers
52 views

White and Pink Noise Generator Circuit - Cryptic AC Analysis

The “Electronic Devices and Circuit Theory” book (by Boylestad, Nashelsky) gives a brief description of a random noise generator circuit at the end of “BJT AC Analysis” chapter. (Btw, exactly the same ...
1
vote
3answers
38 views

LED Brightness or Luminance is additive or not?

Let us say I have an LED whose brightness or luminance value is 50 Cd/m2. If I lit 10 same type of LEDs with same conditions of current and voltage then will the brightness of these 10 LEDs will add ...
0
votes
1answer
50 views

Do transistors naturally have resistance on base, collector, and emitter?

I'm using a circuit simulation app called EveryCircuit, and for the npn transistor settings it has forward beta, reverse beta, base resistance, collector resistance, and emitter resistance. I'm a bit ...
0
votes
3answers
63 views

op amp non-inverting input isn't working?

simulate this circuit – Schematic created using CircuitLab Why in above schematic if i left the non-inverting input floating or connected to 1V or 3.3V the LED stays ON and current doesn't ...
-3
votes
0answers
15 views

Question about HS-1100WP [on hold]

Are the HS-1100WP Servo any good? I have only seen a couple of videos about them they calmed they are excellent. I plan on using them in a Zero turn Mower. Does anyone know anything about them? Thanks
1
vote
2answers
33 views

TFT RGB LCD construction and

I am trying to understand the construction of an RGB TFT LCD that has brightness control in it. I could not understand how does the TFT color LCD pixels glow? Does each of the pixel has its own light ...
0
votes
1answer
36 views

sanity check, current distribution

This is a really basic question I know, I am just doubting myself for some reason. I am trying to make a power distribution board. I have a 12v power supply rated to 20A. If I arrange my DC Jacks in ...
-1
votes
0answers
29 views

i have a problem with my battery pack for a flashlight.help me please [on hold]

Guys I'm planing to make a brightest flashlight recently. i have 8 lithium battery with a voltage of 3.7v and 4800mah per battery and 4 battery with 3.7v and 6800mah so i have calculated the voltage ...
2
votes
3answers
43 views

How does current flows to the ground in Delta connection (Ungrounded) in an Earth Fault?

I'm an electrical engineering student and I'm currently in In-Plant training in Electricity Company of my country. Recently I visited an electrical grid. I got to know about Earthing transformer. I ...
0
votes
2answers
35 views

What happens to the torque/speed curve of a brushless motor when I increase the voltage?

Here is a an image of the torque/speed curve. My guess is that increasing voltage will simply translate the curve up because the slope is the torque constant, which is a physical motor property that ...
-1
votes
0answers
25 views

Need the suggestion for sensor [on hold]

I am going to start a project where I need to check that if the cricket ball is hitting on a particular area on ground second the speed of this cricket ball. I need one solution which can fulfil my ...
0
votes
0answers
14 views

Bandwidth of the system (amplifier) [on hold]

What is DC-200kH bandwidth and How much will be that bandwidth?

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