President Jackson OLD shutdown in USB mode

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lbcomms
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Re: President Jackson OLD shutdown in USB mode

Post by lbcomms »

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.
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