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31  Using Arduino / General Electronics / Re: Charging Arduino-compatible battery wirelessly on: December 27, 2012, 02:13:26 pm
It would depend on whih arduino, at watever voltage you are using, and I'm sure you will need some modifiation regardless of what you find
32  Using Arduino / General Electronics / Re: Variable Voltage Regulator on: December 25, 2012, 01:47:01 am
I can't give you a shematic, right now anyway I'm on my phone, but yes a 10-12v supply would be neccesary although you could probably get away with a small booster circuit if the input impedance of the ballast is small
But the circuit will be a simple transistor switching the 10v supply and passing that thru a lowpass filter
33  Using Arduino / Microcontrollers / Re: good source for ribbon cables w/connectors? on: December 25, 2012, 01:42:04 am
How do those work? I've seen it in radio shack but never been tempted to buy
34  Using Arduino / Project Guidance / Re: Use an Arduino UNO as a USB-to-Serial converter. on: December 24, 2012, 06:55:20 pm
Swap the rx and tx, since the labeled rx and tx is of the 328p not the atmega8/16u2
So put rx of the arduino to rx of the board and same with tx and it will work
35  Using Arduino / Microcontrollers / Re: good source for ribbon cables w/connectors? on: December 24, 2012, 05:41:13 pm
Its for an lcd screen that came with 16 pin single row headers, so I designed it on my board to be the same, in hindsight I coulda done a 16x2 on my board and have the others as grounds which would help keep out interference, right now I'm using just half of a 16x2 cable but its not long enough for my application, just good for testing right now
36  Using Arduino / Microcontrollers / Re: good source for ribbon cables w/connectors? on: December 24, 2012, 05:25:55 pm
Hmm yeah I searched ebay and did not find the same type of connector in 16pin single row, however I found 8pin straight "dp" style cable/connector so I will just use two of those for now
37  Using Arduino / General Electronics / Re: sound like a burnt chip? on: December 24, 2012, 05:23:42 pm
Well that fixed it! Apparently the multimeter was just enough pressure to make contact somewhere, but it works fine all the time now without any pressure applied, and yeah hot air works perfect for small stuff with like soic8 and 0805,1206 stuff but for the 32tqfp it just didn't work out as well, lesson learned
And lol ill be one of those who swear by it because it just worked lol
38  Using Arduino / Microcontrollers / Re: good source for ribbon cables w/connectors? on: December 24, 2012, 01:42:31 pm
That's exactly what I'm looking for , I just need to find it in a 16pin straight version lol, last time I needed one I ended up buying 4 4pin female,female jumpers which works but isn't that legit
39  Using Arduino / Microcontrollers / Re: ATMEGA328p Standalone 8MHz @ 2.5v on: December 24, 2012, 10:09:51 am
Hard part is having a reliable precision device to start with to calibrate thr rest, unless its a precision current source it won't be accurate, unless its a precision resistor it won't be accurate, might as well just buy a better multimeter lol
40  Using Arduino / General Electronics / Re: Relay driver on: December 24, 2012, 08:39:02 am
I do believe the uln2083 had 500ma per channel, but I believe a total of 2.5amps for the whole device
41  Using Arduino / General Electronics / Re: Relay driver on: December 24, 2012, 08:30:15 am
You will probably need to use discrete transistors/mosfets to get that kinda rating , especially if its more than 500ma each ch, but why so much?
42  Using Arduino / Microcontrollers / Re: good source for ribbon cables w/connectors? on: December 24, 2012, 08:22:08 am
I've bought connector ends before and all I found was like each wire individually crimp on ones that ended up being a pain to do and didn't work that well, that's why I think it'd be worth to just buy a whole cable
But where would I get those ur saying? I think I've seen them before, and actually reused one before too
43  Using Arduino / General Electronics / Re: Variable Voltage Regulator on: December 24, 2012, 08:17:45 am
There's. A formula and many calculators online too that will tell you the ripple and response time of any RC lowpass filter at a particular frequency, less ripple makes it less responsive and vice versa
44  Using Arduino / General Electronics / Re: sound like a burnt chip? on: December 24, 2012, 08:00:29 am
I think it was pretty light contact, some I wasn't sure because some flux residue seemed to be in the way, I used the solder blob method and wicked away the excess hopefully that was it, I have a spare but resoldering them isn't too fun
Ill test it after work today
45  Using Arduino / Microcontrollers / Re: ATMEGA328p Standalone 8MHz @ 2.5v on: December 24, 2012, 12:16:43 am
Its probably like my meter, the regular (non shunted) terminal has a max 200ma current measue ability and it works just like that
You could alternatively put a precision 1 or .1ohm resistor in series with the supply and measure the mv across it to get the current
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