More than one of a thing, performing the same task simultaneously
0
votes
1answer
30 views
Two L298N for two stepper motors
I have two stepper motors (ripped from old scanners) and two L298N ICs. I have to connect these motors to the STM32 MCU, and I'm going to use this scheme:
I want to make one board for two motors ...
0
votes
4answers
106 views
Circuit capacitance question
Given the following circuit, what ways there are to calculate its total capacitance?
Thing is this is not a simple case, and I can't really decide which part is parallel and which is a series, ...
1
vote
3answers
115 views
How do you set the reference voltage for a comparator?
I know this is certainly a beginner's question but am a first year student so hopefully I can be forgiven.
I was looking through a electronics booklet provided by IKES website, and it's talking about ...
1
vote
2answers
85 views
How to get higher amperage out of a power supply?
I currently have a 24V - 5A power supply in a commercial product that may require upwards of 8A from the load. Ideally, I would just hook up another 24V - 5A power supply in parallel and not worry ...
0
votes
1answer
54 views
Charge at 24v and discharge at 12v for battery system
Is my thinking correct.
Below is a simple diagram of the concept I want to check.
Is this:
1: Possible
2: Feasible? I.E are there any concerns or foreseen issues with this design?
Edit:
1
vote
4answers
109 views
How can I control a LED with two separate control circuits?
I have a LED controlled by a microcontroller.
I want to know how I can bypass this microcontroller so that I can control the LED with a separate current. Would I use transistors to switch between the ...
1
vote
1answer
77 views
I am failing z-parameters, but I don't know why
I need your help to see where am going wrong.
A two port network driven at both ports such that the port voltages and currents have the following values:
\$Z_0\$ = 50 ohm
\$V_1\$ = 10 < 90 - ...
1
vote
1answer
94 views
Can I get 7A of current from two 3.5A rated batteries (without an increase in V)?
I have two variable batteries with the following specs:
Li-polymer
Capacity : 20000mAh / 74Wh
Input (for charging) : DC 15 - 19V (1.3A max)
Output : DC 12V / 4A
DC 16V / 3.5A
DC 19V ...
0
votes
2answers
133 views
connecting two capacitors in parallel
two capacitors are paralle connected with an open switch. both have diffrent capacity in which: $$c_1>c_2$$
and both charged with diffrent voltage
$$v_1\neq v_2$$
and now we close the switch.
...
2
votes
3answers
99 views
Parallel LCD screen to serial? (1 dedicated microcontroller?)
I'm a newb with electronics and was wondering if there's an IC or PCB that could convert a parallel LCD connection to Serial so I can use 2 wires to communicate with the screen using an arduino and ...
0
votes
3answers
73 views
How to gauge resistance on parallel circuit with step down buck regulator
I'm trying to create a circuit with two loads in parallel ( essentially piggy backing one circuit on the power supply of the other ). Circuit 1, the main circuit requires ~900ma at 12v. Circuit 2, ...
4
votes
3answers
330 views
crystal oscillators connected in parallel
why there are two crystal oscillators connected in parallel in the circuit above? i am familiar with the configuration of Q2( look at the schematic) but what is the purpose of Q3? do i really need ...
1
vote
2answers
112 views
Connecting nine LEDs
I am making a small project for myself but have very limited knowledge on electrical engineering (V=IR is about all i know). I want to power nine LEDs (max 28 mA, 2.25V) with one battery. Do i connect ...
2
votes
2answers
160 views
Can someone explain this simple schematic? (capacitor with voltage regulator)
Please understand that i am actually a really beginner in electronics.
I found a really nice topic on how to create a 5V DC from a 9v power supply. All is ok. But in order to smooth out ripple, the ...
0
votes
3answers
78 views
Why does a voltmeter show voltage drop
Consider this circuit.
What would I get if I measure over R1? It should be less than 12v, right? But then what volatage is LAMP1 running at? Is it still 12v, or is it the voltage I measured across ...
1
vote
2answers
180 views
Why does a voltmeter read lower across a load than across a supply?
From the Wikipedia article about series and parallel circuits:
As an example, consider a very simple circuit consisting of four light bulbs and one 6 V battery. If a wire joins the battery to one ...
1
vote
1answer
83 views
Can I use two LMD18200 in parallel?
I'm building a DCC booster that at present uses one LMD18200 as per the circuit diagram. This gives me a continuous current draw of 3A, however I'd ideally like much more amperage (since I'm running a ...
1
vote
2answers
133 views
Paralleling of 2 power supplies with different voltages
I have 2 full bridge dc-dc converter from 12 to nearly 170 volts. each one are designed to 250 watts...
I am designing the transformers and is very complicated to make exactly equals by homemade and ...
0
votes
2answers
112 views
Series - Parallel Resistor Calculations
Hi,
I would be very grateful if anyone could shed some light on the below diagram as I'm trying to calculate the total resistance between A and B in this series parallel configuration.
10 and 20 ...
1
vote
4answers
118 views
Finding voltage in series-parallel
I'm working my way into an Electronics Technician career diploma and have came across a question that is kind of throwing me for a loop.
I'm kind of confused on which resistors would be considered ...
1
vote
1answer
254 views
Series and parallel Lipo question (20,000mAh capacity)
I got a battery bank from China and it says in the back that the rated capacity is 20,000mAh (3.7V). After some use (charging my laptop) I decided to open the thing and I noticed four cells of 5000mAh ...
3
votes
2answers
175 views
Which interface is better for my OLED displayer?
I have a 0.96 inch 128x64 Yellow-Blue oled display module like this: OLED module and i want to use of it. The Driver is SSD1306. When you see in the SSD1306's datasheet you know it support 8-bit ...
-2
votes
2answers
69 views
Trying to visualize the wording of a question about finding the resistor that carries the highest voltage
I know how to find the higgest current in the resistor, it's just the visual that I'm second guessing.
This is the question.
This is the what I drew from it
1
vote
2answers
95 views
If voltage is the same across each resistor in a parallel circuit, what's the point of resistors if there's 4 of them in a ciruit with 50volts
If voltage is the same across each resistor in a parallel circuit, what's the point of resistors if there's 4 of them in a ciruit with 50volts, it won't affect the voltage.
I also noticed that when ...
0
votes
1answer
126 views
Programming several AVR MCUs simultaneously? (with parallel)
I was able to program three ATMEGA32 simultaneously using ISP.
In your opinion, can I program several AVRs at once with parallel? Unfortunately, I do not have a parallel programmer. Can you test ...
0
votes
1answer
62 views
Can I charge multiple identical devices in parallel from on transformer
I have four identical devices (HDD enclosures), each requiring 12V, 2000mA. Each of them came with their own power supply/DC transformer, but they are fat and chunky, and if possible I'd like to ...
-4
votes
1answer
126 views
How to Calculate battery drainage from a set # of LEDs
I will be wiring 18 LEDs to three 3.7V batteries(600mAh) in parallel. 10 of the LEDs are rated at 4.5V with 40mA and 8 LEDs are rated 3V with 20mA, how long will these 18 LEDs run on the three ...
-6
votes
3answers
196 views
What is the effective capacitance of this circuit?
I'm trying to work out, in general terms, the effective capacitance of this circuit between Out_1 and Out_2:
What is the effective capacitance of this circuit and will the resistors affect the ...
1
vote
2answers
91 views
Parallel circuit
What happens if i connect 2 or more similar 12 volt and 5 amperage electrical adapters in parallel to a single load to avoid power outage and continuous power supply.
Volt= 24 or 12
Amp = 5 or 10
...
2
votes
1answer
176 views
Parallel->Series switches for capacitor bank, only one charges
Here's my goal: To create a capacitor bank to dump a load in to a load resistor/inductor, pulsed, without using switches and keeping it as isolated as I can from myself.
Here is what I have so far:
...
1
vote
1answer
77 views
MM5452 with 4 digit parallel 7-segment LCD display
I have a question regarding the backplane connection for the MM5452. From this data sheet:
MM5452/MM5453 Liquid Crystal Display Drivers
It says that the backplane pins on the MM5452 connects to a ...
8
votes
4answers
2k views
Transistors in parallel
I want to use several transistors in parallel to control current through a load. This is to distribute the current through the load across the transistors so that individual transistors with a rated ...
1
vote
1answer
74 views
Parallel to less parallel without throttling
I'm modeling a camera-serial interface in Verilog. My design takes video frames in, packetizes them in a certain format, and then distributes them among 1 to 4 parallel lanes. Each lane is 8 bits ...
3
votes
2answers
214 views
Can I use more diodes for lower voltage drop and higher current?
The problem is simple: I have bought an UBEC, which should accept 7,6V from my battery and give me 5V to power my electronics. But the one I bought does not give me 5V, but 5.3V - that could cause ...
3
votes
2answers
1k views
Parallel port output in C++ on Win7 x64
First of all, I have searched the internet all day long, including here on stackexchange, and couldn't find a clear solution. Only ambiguous answers and dead links.
Let's start with what I have: my ...
4
votes
0answers
70 views
Implementation of AES algorithm using Systolic architecture
I need to generate a VLSI Systolic array to implement the AES encryption algorithm with key length of 128 bits. Following are the possible ways :
Systolic for Key expansion
Systolic in MixColumn ...
0
votes
1answer
122 views
Running 7V motors with 2x 3.7v batteries
We're really enthusiastic to build a homemade quad-copter with almost no knowledge about such things. We will probably use Arduino and Bluetooth to control it, but we have a question about the motor ...
1
vote
2answers
111 views
Powering two 8-Ohm speakers in parallel with a 4-Ohm per channel audio amplifier
Are there any possible problems powering two 8-Ohm speakers in parallel with an audio amplifier designed to drive 4-Ohm per channel? (Both the speakers and amplifier are generic, and the speakers are ...
3
votes
3answers
418 views
ASIC vs ? — Performance & Cost
I'm interested in creating a custom linux based solution that will crunch sha256 cryptographic algorithms at insane levels of speed. I'm also on a limited budget... I have no background in EE but I ...
2
votes
1answer
186 views
How exactly do all FPGAs work together on this board to carry out high speed calculations
The board I am referring to is called "Merrick 3" from "Enterpoint (ltd)". The web page can be found here: http://enterpoint.co.uk/products/asic-development-high-performance-computing/merrick-3/
I ...
2
votes
1answer
149 views
OpenCL for Altera FPGAs
Recently I have been quite interested in OpenCL of the Khronos Group, and already gained some experiences with the language. I'm excited to know that OpenCL now works with Altera FPGA.
...
4
votes
2answers
268 views
How to deal with multiple pull-up resistors on modules
I was thinking about doing a modules for a development board I did a few days ago that will include spi/i2c interfaces.
The problem is that I didn't included pull-up resistors in the MCU pins in the ...
4
votes
3answers
300 views
Diodes in parallel
I need to protect about 5A @ 6V from something stupid like my revering the battery wires when connecting them to the circuit. I thought that I could use 5x 1A diodes in parallel, but it seems that I ...
2
votes
2answers
315 views
Designing parallel RLC band-stop filter in series with load from f0, gain, Q parameters
I've been trying to design a band-stop filter for my headphones to cut back on excessive highs and to provide a more flat frequency response.
With a software EQ and lots of tries, I managed to arrive ...
0
votes
2answers
286 views
Finding Thevenin equivalent
I'm looking to find the Thevenin equivalent of two parallel voltage sources where each source has some internal resistance as well for simulation in Matlab. I don't know where and how exactly to put a ...
0
votes
3answers
73 views
Finding source voltage, v1, and I1 in a circuit with a current source
simulate this circuit – Schematic created using CircuitLab
*Can anyone tell me why this circuit would be considered parallel instead of series?
0
votes
1answer
134 views
24-bit parallel TFT module on circuit designed for 16-bit parallel
I've designed a circuit that connects a 16-bit parallel LCD TFT module to the SPI-connector on a RPi, but bigger TFT modules often have 24-bit parallel. Can I use a 24-bit parallel TFT with my circuit ...
6
votes
1answer
118 views
How can SCRs be effectively paralleled?
I'm designing a precharge circuit which will carry 200A when closed. I'd like to use MCO150 Silicon Controlled Rectifiers, but they won't handle the current. Two in parallel looks like the most ...
-2
votes
6answers
4k views
how to calculate total resistance in circuit with parallel and series resistors connected
A battery of EMF 8.0 V and internal resistance r = 1.0 – is connected to an external circuit as shown:
I need to find out the total resistence and my problem is that I dont know which resistors ...
5
votes
2answers
207 views
Mathematical approch to measuring current, voltage and resistance of mixed series and parallel
If there is a circuit like the one below, where all resistors are 1k ohm, how does one determine the currents? The voltage sources are all 10 volts.
The problem I am having is that I do not know if ...
