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31
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Using Arduino / General Electronics / Re: Need a simple audio amplifier
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on: May 03, 2013, 11:35:03 pm
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the 2222 is not that great for amplification applications, have you tried your other transistors? (look at the datasheets, like the 328 is a PNP, the 549 and 550 are npn)
and loud is depending on the source, some hard nasty square waves though a single transistor amp is going to be brutal, music on the other hand may not be as noticeable.
personally I am not that good with amp's, I just kind of throw crap at it until its to my tastes (in the case of your third circuit), both cap's are electrolytic, c1 blocks DC and depending on what size it is will cut off frequencies, not entirely sure what C2 does but its probably for clarity of some form
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32
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Using Arduino / Storage / Re: SD.h library reading speed
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on: May 03, 2013, 12:27:18 am
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the stock sd library is a watered down version of sdfatlib, and you can get that going pretty fast if you use a 74hc4050 for level shifting (dont have an exact number off the top of my head) guess it depends on which SPI speed its set to in the library
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33
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Using Arduino / Programming Questions / Re: Why would this code..
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on: May 01, 2013, 09:33:28 pm
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avrdude: please define PAGEL and BS2 signals in the configuration file for part ATtiny85 common error that I get every time on a tiny for years, safe to ignore as far as your led issue, it may be taking so much time at 1mhz to update that it just jumps, were as 8 times the speed it smooths over it
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35
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Using Arduino / General Electronics / Re: 5V regulated power
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on: April 30, 2013, 12:44:10 am
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yes the 5 volt pins connect directly to the arduino hardware, if you apply 5v somewhere it outputs 5 volts, if you input 5 volts it just feeds that branch just like the output of the USB or voltage regulator on the DC jack
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