Questions tagged [parallel]

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

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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 ...
13
votes
7answers
14k 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
669 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
3k 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 ...
2
votes
1answer
784 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 ...
42
votes
11answers
42k 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
19k 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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