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Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Il probibly go with linear as i have a lovely big 3x 14.6v transformer rated at 27.5A if all the outputs are in parallel (so i could make a 9A 0 to ~40VDC Power Supply with some work)
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Here is a very good, accessible, paper on linear power supply design that gives you just about everything you need to know - and overturns some popular fallacies into the bargain:
Registered Member #2288
Joined: Wed Aug 12 2009, 10:42PM
Location: Cambridge, MA
Posts: 179
BigBad wrote ...
The ATMega is the chip in the arduino isn't it?
As I understand it, the built-in PWM is sampled at 2ms, so you can only get 500hz out of it.
However, a software timed thing can toggle an output pin much, much faster; but then the chip can't do much else, but that may not matter.
What do you want it for?
The arduino software cripples the ability of the PWM of the atmega chips. If you manipulate the configuration registers and set the timer prescaler yourself, you can get pwm up to clock_frequency/2 (of course, it'd only be 1 bit pwm! Full 8 bit would be limited to clock_frequency/256)
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yes, this is an important point, the Arduino libraries can be a bit pathetic in some respects, but they don't stop you going past them and accessing the hardware directly.
Besides the original post said "ATMega" not Arduino.
Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
I'm really surprised noone mentioned a DDS chip yet
serial or parallel control, precise frequency and waveform control for some... I think this is the best tool for this especially if you want to keep some MIPS for doing utilitary tasks (LCD and keyboard, or USB, etc..)
Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
I'd have a look at manufacturer websites for free samples, otherwise they sell breakout modules on ebay for cheap with everything you need in (quartz + circuitry for basic application)
I bought a complete module for something like 15€ or even less which had pins for parallel, SPI and output plus power and several other things
EDIT: just some identical module as the ones you show, but I think prices have dropped down hugely!
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Serial Controlled Function Generator chips
