A very boring yet crucial part of any setup. A buffered multi always comes in handy and it’s pretty easy to build as well. Since I was building one myself I added a few leds to indicate signal and it’s polarity, that way I got some indication what’s going on. I used 2 separate leds since I didn’t have any dual coloured leds lying around. It would look a bit fancier with a dual led, maybe I should order a few, just in case I build a few more of these.

A single quad opamp configured as voltage followers handles all the buffering, the fourth one drives the leds and is configured as a comparator. I used a TL074 since I have tons of them lying around, but most quad opamps should work just fine.

Schematic

*Usual disclaimer applies, if you accidentally break
the space-time continuum, don’t blame me.

Links

BOM & build guide

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