Don't worry. An underpowered power supply almost certainly won't damage the device it's powering, at least unless it fails. That amperage rating essentially tracks the internal resistance of the power supply, and that 150mA rating means that either the traditional transformer (heavy-ish, large-ish) or the switching mode circuit ensures 9V output or close enough up to 150mA, after which, in the case of a traditional transformer, the effective voltage at the device almost certainly goes down (and eventually, especially if the load requires a very high amount of current compared to the rating, the transformer might blow spectacularly because most of the power is being dissipated by the supply itself). A switching mode power supply will actually hold steady for quite a while since SMPSs are very good at regulating voltage (you might see, like, half a volt or one volt drop even with gross overloads) but then it will eventually POP! in a much safer way compared to a traditional transformer failure.
I actually did a test back in uni about this. The SMPS took, like, five or six times its rating before giving up.
Still, don't push your luck. Was the power supply very warm by any chance?
TLDR: don't worry.
I actually did a test back in uni about this. The SMPS took, like, five or six times its rating before giving up.
Still, don't push your luck. Was the power supply very warm by any chance?
TLDR: don't worry.
Statistics: Posted by ampetrosillo — Fri Mar 29, 2024 11:27 pm