<p>The Drone Lab can be run off of a 9 volt battery or a plug in power supply.<br />
<strong>USING BATTERIES:</strong><br />
The total current draw is between 20 and 30mA. Most 9 Volt batteries are rated at around 600 mA Hours. That means that the Drone Lab should be able to run for about 20 hours straight on a single battery. When the battery starts to die, the volume and pitch will drop and the filters will become much softer. If you feel that your Lab has lost it's "edge" over time, you probably just need a new battery.</p>
<p><strong>USING A POWER SUPPLY:</strong><br />
The Lab has an operating range of around 5 to 15 volts DC. The ideal operating voltage is 9-12volts. When choosing a power supply it is important that you test the output with a voltage meter. Most power supplies put out a voltage higher than they are marked. For instance a 9 volt supply may actually put out 14 volts. Higher quality supplies are usually much more accurate.If you don't have a meter, it would be safest to purchase a high quality, regulated, 9 volt power supply. Supplies intended for use on computer equipment like routers, external hard drives and similar items are usually very accurate.<br />
Cheap supplies are often unstable, inaccurate (can be off by 80% of marked voltage) and noisy. A noisy supply will result in a noisy Drone Lab. </p>
<p><strong>WHAT SUPPLY SHOULD I BUY?:</strong><br />
The ideal power supply is 9-12VDC, 50-100mA (more is okay, less is not), negative ring, positive tip, 2.1mm tip.<br />
<a href="http://www.allelectronics.com/make-a-store/item/PS-1224/12VDC-2A-SWITCHING-POWER-SUPPLY/1.html">Here's the supply I use on my Drone Lab.</a></p>
<p>It's a bit stronger than it needs to be, but it's vary stable, and is a switching supply which means I can plug it into US or european outlets and it always outputs exactly 12 volts DC.</p>
<p><strong>DID I BREAK MY DRONE LAB WITH TOO MUCH VOLTAGE?:</strong><br />
Using voltage greater than 18 volts DC can and probably will damage the circuitry. It's best to use a supply below 15 volts DC<br />
 If you think you may have damaged the circuit with high voltage, try switching out the ICs. These are the most delicate components and the only ones likely to be damaged by excessive voltage.<br />
-The 556 ICs control the division settings.<br />
-The 40106 generates the oscillators and master clock.<br />
-The TL074 generates the filters.
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