The parallel tag has no wiki summary.
3
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3answers
151 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
138 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 ...
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0answers
48 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
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2answers
108 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 ...
3
votes
3answers
108 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
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2answers
144 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
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2answers
91 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 ...
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3answers
57 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
68 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
90 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 ...
0
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0answers
90 views
How to sum or calculate voltage or current harmonics component that are in parallel ?
Recently I measured voltage and current harmonics in coal mining industry. But they only have Power Quality Meter with limited current clamps (not big enough for the PCC(point of common coupling)). So ...
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5answers
529 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 ...
3
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2answers
142 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 ...
3
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3answers
224 views
Parallel and Series Circuits Question (Electron Flow)
So this is a pretty basic question, I understand the aspects of parallel and series circuits but don't understand why?
For instance:
How can the Battery be "drained" faster when say 3 LEDS are ...
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vote
3answers
185 views
Math to predict current in circuit with different voltages in parallel
I was playing around with my voltmeter and I came across something I don't know how to work the math of.
The circuit built was the one below, the right power supply was a 9V battery and the left was ...
3
votes
1answer
120 views
How do I calculate the voltage at these locations?
I'm wondering how to calculate the voltage on the following charts (series circuit and parallel circuit). I'm interested in the math process involved, not the answer.
I'm mostly confused about how ...
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3answers
640 views
What are some uses of series and parallel circuits [closed]
My professor has mentioned some uses of series and parallel circuits. Could someone give me some more examples of each especially series. I would like to understand the two more in how they contribute ...
1
vote
1answer
141 views
Peltier generators series vs parallel
If you are using peltiers as generators do you get double the voltage if you connect two in series, and double the ampage if you connect two in parallel?
2
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1answer
473 views
How to communicate between 8051 microcontroller and PC
I am working on a project of mine in which I am getting data from multiple sensors into an 8051 microcontroller.
I'm building a car simulator in which I have various car components such as a steering ...
3
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1answer
2k views
Resolved: Howto re-wire Sony Simulview 3D glasses for Dual Play Support
Circuit board here:
These active shutter 3D glasses work by alternating a shutter lens on and off in sync with the TV and the resulting effect is that 120 Hz refresh are used for left eye, and the ...
2
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2answers
249 views
Series and Parallel together for 3 Solar Panels?
I don't know who to ask about this. I know it works, but don't know if it's a good idea or a safe idea.
I have 3 solar panels, 240W each.
I have a need for 720W max and 60V.
I thought. hmmmmm, put ...
4
votes
4answers
276 views
More than 2 resistors in parallel
Most people know the formula for the total resistance of parallel resistors:
\$ \dfrac{1}{R_t} = \dfrac{1}{R_1} + \dfrac{1}{R_2} + {}...{} + \dfrac{1}{R_n} \$
If there are only 2 resistors, that can ...
2
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2answers
173 views
If I were to design a multi core processor with a lot of cores, what are the pro cons of having 8 bit, 16 bit or 32 bit cores?
I was lurking into wikipedia, looking about processors with the highest number of cores, and obviously when you need cores to communicate between each other it can be problematic since it require much ...
0
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2answers
93 views
Should I use a parallel or serial connection?
I need to split one power cord from the wall socket to power three 20w lamps.
Should I use a parallel, or a serial connection?
Follow up question: In which ever case, where can I find some ...
1
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3answers
126 views
Pipeline and real parallelism?
I have read several articles which say that the CPU has the ALU (and other small specific execution units), Control Unit and the Registers and well other buffers/pipelines, internal buses etc.
The ...
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8answers
452 views
Writing to parallel port with minimum latency
I want to use a parallel port to control some stepper motors (many of them). So far I've got it connected to a little test board with LEDs and I've written a C program in Linux to set the pins using ...
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2answers
697 views
wiring LED's in parallel - need series resistor?
I would like to confirm something I have inferred through my looking into LED wiring and also have a couple questions answered. For the sake of the examples below assume the source voltage is 5v; my ...
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votes
1answer
101 views
Parallel port output
I have a small board that controls some appliances through the parallel port.
What i want to do is to put on high/low pin X with out modifying the rest of the pins (short story, control each pin ...
4
votes
2answers
3k views
Why is connecting two different voltage sources in parallel dangerous?
I'm working through a circuit analysis text on my own for the purposes of getting started with Arduino. I just came across a box that explained why putting two different voltage sources in parallel is ...
3
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2answers
561 views
Possible to parallel PC power supplies & increase voltage to 14 VDC?
I'm in need of 14 VDC @ 100 amps. Switching power supplies are available but too costly. I have enough supplies left over from various desktops to assemble such a beast it's just how? This is to power ...
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4answers
487 views
Can you split power between two voltage regulators?
In order to supply more power to a circuit. can you split the power between 2 voltage regulators, in parallel?
Can this overpower one of the Voltage Regulators?
1
vote
3answers
526 views
Want to control 30V LED strip with a microcontroller, any help or ideas?
Like the title says i want to control around 30volts of current (multiple LEDs that will be running all at once, added up to about 30volts.) i want to use a micro-controller to control it so i can add ...
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1answer
103 views
LPT1 to USB converter fast speed
I have a DOS Based "black box" which prints out to the parallel port,
the need is to capture these data for later analysis.
I saw some project based on FT245R, do you have any suggestions ?
4
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2answers
459 views
Transistor array with a common base
I'm looking for a transistor array IC with a common base to all the transistors, but I'm having some trouble finding what I'm looking for. Essentially, what I want is to take 8 data lines in parallel ...
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5answers
385 views
Resistors in Parallel
I understand that when you put Resistors in parallel the resistance decreases, my question is why does this actually happen? What causes the Resistance to decrease? When Resistors are in serial, their ...
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2answers
2k views
Connecting LEDs to a 9V battery
1) I have 6 4.5V 20mA LEDs and have connected them to a common 9V battery. Doing this I made 3 parallel circuits with 2 LEDs in each.
Now, I see that most pages that describe LED circuitry say that ...
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4answers
496 views
Which relay switches can be activated by the parallel port?
I'm planning on controlling some external circuits using the parallel port by switching on relays that can switch on the external circuits.
Am I right in thinking the pins have a voltage of 3-5V when ...
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4answers
734 views
Will a 0402 0.01uF cer cap next to a 0402 0.1uF cer cap have any power decoupling benefits?
I always understood that the point of using smaller caps in parallel was to provide low impedance at higher frequencies than the bigger caps, BECAUSE the higher capacitance caps 'usually' had larger ...
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2answers
403 views
Capacitor in parallel with resistor on xoscope amplifier schematic
Short version: Why is C3 necessary in this circuit?
Explanation:
The schematic for the input buffer/amplifier circuit for xoscope is made up of subsections that are mostly broken down in the ...
3
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2answers
736 views
Effect of Battery charging with un equal batteries in parallel
I have 24 VDC to 220 VAC Inverter and two 90 Ampere Batteries now I feel that backup is not what I need now I intend to connect these two existing batteries in parallel to give total of 12 volts and ...
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2answers
1k views
Simulation of parallel port but without a parallel port
I've been working on a project in my faculty that requires me to use a parallel port, but as I see my laptop doesn't have one!
I've been searching for a way to simulate the parallel port on my ...
2
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1answer
1k views
Why is there risk of overvoltage when jump-starting a vehicle?
Ford Focus C-Max manual describes jump-starting procedure as follows:
shut off everything, connect the jump cables, start the donor vehicle engine and let it run for a while, turn the ignition key on ...
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2answers
228 views
Implementation of a large parallel algorithm for communication with a server
I want to run a parallel algorithm I will implement in Verilog/VHDL and use a FPGA to run it.
I have some questions:
How can I make an http request to servers using an FPGA - should I use a ...
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3answers
537 views
Writing to a Parallel to USB convertor [closed]
I hope this is the right forum, I've only ever used StackOverflow and am new to Electricals.
I have written an Access Control program in Delphi which sends an 8bit value to one of the three parallel ...
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7answers
19k views
What happens if I connect two different DC voltage sources in parallel?
I have a computer power supply that I'm hacking together as a bench supply. For this particular model to power on, I need a minimum load across both +5V and +12V.
"Easy," I thought, "I'll just ...
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2answers
219 views
Connect a microcontroller to a gadget
Although I have average programming skills, I'm not far from being an noob concerning electronics!
I therefore want to kindly ask you to help me connect my (already programmed) Arduino Uno to the ...
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2answers
454 views
Single resistor powering multiple LEDs in parallel where current through resistor is lower than max allowed current for an individual LED
While writing an answer about using multiple diodes connected to a single resistor, I stumbled upon a case about which I haven't read a lot: What happens when we set the resistor so that it sets the ...
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4answers
7k views
Why exactly can't a single resistor be used for many parallel LEDs?
Why can't you use a single resistor for a number of LEDs in parallel instead of one each?
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1answer
300 views
10 bit PISO shift register
I have a device that has a 10bit parallel output that I need to get to a serial input.
Can I use a 16 bit PISO shift register and somehow ignore the 6 LSB?
How might that work?
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3answers
670 views
Using Parallel port to Power circuits
How to use PC parallel port as a power supply for any device (similar to charging Mobile Phones). Actually I have to powrer my circuit based on parallel port. Which pin of parallel port can supply at ...
