More than one of a thing, performing the same task simultaneously

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1answer
82 views

Voltage on circuit input different than on power supply

I'm using a really good 5V-35A switching power supply to power some mini PCs (Cubieboards if that matters) as below. simulate this circuit – Schematic created using CircuitLab The weird ...
0
votes
1answer
35 views

How to put a battery and battery charger parallel in a circuit

I am making a speaker that runs at 3-5.5 RMS and I need a battery to supply power to it and so I got a house phone battery pack with a diode now I need a way to charge this so when it is charging that ...
1
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1answer
81 views

LED wiring questions with 9v battery as power source

My son is working on a project in which he is using 36 total LEDs consisting of 7 different LED's. There are 6 different solid colored LEDs varying from 1.88v to 3.2v and one color changing that is ...
4
votes
3answers
212 views

Is it good practice to parallel relay contacts for increased current capacity?

Say I have a DPDT relay, like T92S7D12-24. The contacts of this relay are rated for 30A, but there are two sets of contacts. Can I parallel the contacts to get an effective 60A relay? Further, could I ...
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1answer
51 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 ...
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4answers
120 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
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3answers
131 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
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2answers
96 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 ...
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1answer
73 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:
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4answers
115 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
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1answer
80 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
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1answer
101 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 ...
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2answers
145 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
121 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
76 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
346 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
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2answers
113 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
172 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 ...
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votes
3answers
81 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 ...
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2answers
190 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
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1answer
97 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
136 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
121 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 ...
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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
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1answer
280 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
198 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 ...
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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
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2answers
99 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
130 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
68 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
131 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 ...
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votes
3answers
208 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 ...
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2answers
92 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
189 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
86 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
75 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
238 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
2k 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 ...
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0answers
75 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
136 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
115 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
430 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
157 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
283 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
309 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
320 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
316 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?