DissectAnAdapter
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Walter got some ultra cheap USB power supplies from AliExpress. The price was slightly to good to be true, so brought one along to RevSpace.
The biggest problem appears to be that a 300+ V DC line runs perilously close to the USB connector (near C4). Probably not something to use in moist environments, such as the spark shack. Or maybe if you want to see sparks, one to use in such an environment.