The 7V thing only works with a sufficient load on the +5V rail. You can get around this with a relay and a delay timer, so the computer has a second or two to load +5V before the blower starts. Or, add a big inductor in series with the blower to reduce its start-up current. The relay or inductor would require a diode to protect against back EMF.
If you're into the cycling thing, try a different chain-lube on your blower. The "dry" lubes for use in dusty/off-road riding should work.
|