He picked up an HP6038A power supply for $50. We couldn’t find the original list price, but even refurbs from “professional” sources go for around $800. However, the $50 price came with a ...

When switching off the supply, unplugging it, something else tripping a mains breaker or in case of power loss, the capacitors of this -3V reference would run out first, resulting in a 3V jump of ...