user17069: What is the ideal power supply for this module? What do you use that works ok?
Will the AMS1117 work?

user4143: Yes, that will work. However, ignore the entire description.
That is NOT a buck regulator - it is a low-dropout linear regulator.  Thus it will waste power as heat - the more current you draw the hotter it will get.
The '1117' range of regulators are pretty much ubiquitous. I use them in a wide range of products and situations where power consumption isn't critical (i.e., not battery based products). 
For lower power requirements you want to get a real buck regulator. Something more like this: http://www.ebay.co.uk/itm/301842020065 
Note that it's an adjustable module, and you will need to first use a multimeter to adjust the output to 3.3V before you connect it up. 
Because they are adjustable they are a great thing to keep around since you can use them for all sorts of different situations.

17069: <p>What is the ideal power supply for this module? What do you use that works ok?</p>

<p>Will the <a href="http://www.ebay.com/itm/5PCS-5V-to-3-3V-DC-DC-Step-Down-Power-Supply-Buck-Module-AMS1117-LDO-800MA-CM10-/321963058956?hash=item4af67e670c:g:6hcAAOSwo3pWfi4t" rel="nofollow">AMS1117</a> work?</p>
 4143: <p>Yes, that will work. However, ignore the entire description.</p>

<p>That is <strong>NOT</strong> a buck regulator - it is a low-dropout <strong>linear</strong> regulator.  Thus it will waste power as heat - the more current you draw the hotter it will get.</p>

<p>The '1117' range of regulators are pretty much ubiquitous. I use them in a wide range of products and situations where power consumption isn't critical (i.e., not battery based products). </p>

<p>For lower power requirements you want to get a <em>real</em> buck regulator. Something more like this: <a href="http://www.ebay.co.uk/itm/301842020065" rel="nofollow">http://www.ebay.co.uk/itm/301842020065</a> </p>

<p><strong>Note that it's an adjustable module, and you will need to first use a multimeter to adjust the output to 3.3V before you connect it up.</strong> </p>

<p>Because they are adjustable they are a great thing to keep around since you can use them for all sorts of different situations.</p>
