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- Posts: 361
- Joined: 04 Oct 2015, 08:10
- Location: Sydney, Australia
cb4ever104 wrote: ↑
11 Jun 2019, 09:38
but would that cause the S/RF meter bulb to power off ?
With the one we saw, it did. The owner was powering it from a 240V AC mains to 13.8V DC 3A CB type power supply, which went into current limiting shutdown from the excess current - it probably used an LM350 regulator which shuts down at 3.5A.
The 12V output would have dropped to a few volts on USB, causing the meter lamp powered from the 12V rail to go off too.