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Things you can do with diodes

(lcamtuf.substack.com)
325 points zdw | 3 comments | 03 Nov 25 23:49 UTC | HN request time: 0s | source
1. mattclarkdotnet ◴[04 Nov 25 05:45 UTC] No.45807743[source]▶
This is excellent but in typical low voltage scenarios (5V or lower) the 600mV diode voltage drop becomes very significant. Simple diode half wave rectification works fine at 100V, but at 3.3V it breaks down.
replies(2): >>45807903 #>>45808267 #
2. xxs ◴[04 Nov 25 06:23 UTC] No.45807903[source]▶
at that point (and in general) you'd like to use Schottky ones. MOSFETs are an option for low extra efficiency.
3. tiniuclx ◴[04 Nov 25 07:19 UTC] No.45808267[source]▶
You can also build a rectifier with no voltage drop using an op-amp with some diodes in the feedback loop. But that might be considered cheating :)