Questions tagged [parallel]

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

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40
votes
11answers
147k views

What would happen 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 ...
1
vote
2answers
282 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 ...
4
votes
2answers
2k 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 ...
129
votes
6answers
88k 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?
2
votes
1answer
1k 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?
0
votes
3answers
3k 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 ...
1
vote
1answer
168 views

Circuitry for Running Many Small Motors

I'm creating a simple vibration mat for a child which will be triggered by a force sensor. I'm not trying to do anything complex (like changing frequency of vibration) - simply an on/off circuit. What ...
4
votes
2answers
2k views

Parallel Port - Voltage / Current required for input pin

I am developing a program to send and receive sigal to my circuit and pc. Actually I have to count the pulses or (frequency of high pulse) generated from a 555 timer IC in my circuit. When I connect a ...
0
votes
2answers
3k views

HSR412 (solid state relay) parallel circuit connection not working?

So I got some HSR412s and connected them to my Christmas lights in a serial circuit. It worked great and as expected except for one caveat.... It was getting really hot. I realized I was putting ...
3
votes
4answers
8k views

Your thoughts on connecting multiple leds in parallel and series

I would like to connect 32 3W LEDs together. All the LEDs are the same. Each LED (32 of them): 750mA 2.2V 3W Power Source: Constant Current 3A 100W I thought ...
1
vote
2answers
288 views

Am I drawing more current if I'm giving multiple paths from supply to ground?

Illustrated as such: Am I drawing more current in the first case than the second case? Would this drain the 9V battery faster?
0
votes
3answers
345 views

On CPU start-up cause Start-up my Device Connected on ParallelPort?

I am using ParallelPort to do communicate with One Electric Device. My Task on ParallelPort is to just start and stop device. ...
2
votes
3answers
12k views

how to connect relay and physical switch to control light

I am new in this kind of stuff so please excuse me for my lack of knowledge. I have successfully connected blackwidow (wifi + arduino) with a relay to control a 220V light bulb. Now, I want to embed ...
10
votes
5answers
4k views

How should I connect batteries in parallel?

I have a pair of these Li-ion batteries. I'd like to couple them so that I get double the current. However, I realize that this could be a Bad Idea™, as the charge could flow in a loop through both ...
12
votes
7answers
13k views

6 LEDs in parallel with a single resistor to simplify soldering

I'm trying to wire up 6 RGB LEDs in parallel, all controlled from a single source (well, three sources, one for each colour). The LEDs came supplied with resistors to limit the current of 270 Ohm for ...
4
votes
1answer
662 views

Parallel charger circuits

I'm constructing a power supply based on solar cells backed by batteries. The solar cells deliver between 0 and 4 A, depending on the time of day, while the charger I plan on using, the LT3652, has a ...
15
votes
4answers
2k views

How do I calculate the current in parallel branches?

I've been playing around with an Arduino for a while now, and while I know just enough about simple circuits to get little projects up and running, I still don't know enough to figure out what's going ...
1
vote
1answer
720 views

LCD parallel interfaces

I might not be able to find an LCD with a 24 bit parallel interface, which is what my controller requires. I have seen 18 bit parallel interfaces, though. I assume that I could really just use the ...
39
votes
11answers
35k views

Is paralleling diodes a bad idea?

I'm trying to repair an 800W power supply (see my previous question on this.) One thing that gets me is that the design has two schottky diode packages (in TO-220) in parallel. I was always told this ...
4
votes
2answers
2k views

How to use Control Register inputs of LPT port?

I would like to use Control Register controlled pins of LPT (1, 14, 16, 17) as inputs. These are said to be normally used as open collector outputs, but have the ability to operate as inputs too. This ...
5
votes
2answers
3k views

Using Pullup and Pulldown Resistors

I've been researching pullup and pulldown resistors after seeing them used in many digital circuits and while I understand what their purpose is, I haven't found any resource on how to determine the ...
5
votes
5answers
371 views

Managing circuits beyond a basic level

I am very new to electronics so please go easy on me. Whilst I have read a couple of electronics fundementals books so far, one of the things that confuses me the most about electronics is how ...
7
votes
7answers
18k views

Programming a parallel port as digital I/O

I'm trying to use a parallel port from a computer as a form of cheap digital output to do various things (control motors, light LEDs, read limit switches, ect). I want to know how to control the 8 ...
5
votes
2answers
2k views

ATMEGA32 Jtag flash

Can you recommend an inexpensive product for flashing an in circuit (read: powered) ATMEGA32 via JTAG. I have a parallel port available on my laptop dock/port replicator, which I am guessing may be ...

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