I seem to have fixed it by adding a Schottky diode from ground to signal. I think the lower forward voltage and faster switching speed than rectifier diodes helped ¯\_(ツ)_/¯
Finished soldering a core store kit. Weaving thin magnet wire through tiny ferrite toroids took forever. But now I can store 4 whole bytes with this modern reproduction of 50s memory technology! https://www.tindie.com/products/kilpelaj/core-memory-shield-for-arduino/
@technomancy It’s done! Obviously inspired by your wonderful Atreus which has been my daily driver for years (I have a v2 coming too). Tweaks include straight bottom stagger, no bezel, and Bluetooth. Would you be ok with me calling it AtreusV to make the lineage clear? V is for the bottom shape.
Does anyone have a way of finding datasheets of ancient chips? I believe this is a High Speed Dual Comparator similar to the LM319 (https://pdf1.alldatasheet.com/datasheet-pdf/view/8609/NSC/LM319M.html) but it has a different pinout. It’s a TI chip from before 1981.
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