This is a blank PCB to build a linear "USB adapter".  It's a regulated linear power supply that puts out about 5 watts.  It is normally configured for 5V, 1A, but can be set up for other voltages as well.  

I built this to provide power to audio circuits like DACs and phono stages that use a USB power supply.  USB power is ubiquitous these days, but typical USB adapters are horrible, noisy, cheap little switchers.  

For full details on the design and other information refer to my web site.  eBay doesn't let me link to it, but google 'pmillett' and you'll find it.

This auction is for one PCB only, no parts or anything else is included.   Photo of completed supply is for reference only!  

Flat rate shipping via FedEx to US destinations is shown.  

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A person who constructs or works on electronic equipment may be exposed to hazards, including physical injury, the risk of electric shock or electrocution, and exposure to hazardous substances such as lead, mercury, and other inorganic or organic compounds.  These hazards can result in health problems, injury, or death.  Only qualified persons who understand and are willing to bear these risks themselves should attempt the construction of electronic equipment.  By purchasing this item, the buyer acknowledges these risks.

Vacuum tubes operate at high temperatures, may contain toxic substances, and may have exposed parts that carry hazardous voltages.  There is a risk of electric shock, electrocution, burns, or fires that is inherent in the construction and use of vacuum tube equipment.  By purchasing this item, the buyer acknowledges these risks.

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