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@ericfont
ericfont / circuit-20260425-0004.svg
Created April 25, 2026 04:02
tried to improve on Dec 11, 2025 delta + DSM by doing triangles, but failed...better stick to Dec 11 version
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@ericfont
ericfont / unicode_roman_music.txt
Last active April 25, 2026 04:18
unicode roman numerals & musical symbols
↘ U+2198
↗ U+2197
⁷ U+2077
· U+00B7
Ⅰ U+2160
Ⅱ U+2161
Ⅲ U+2162
Ⅳ U+2163
Ⅴ U+2164
Ⅵ U+2165
use verical only metal strip on the table placed about 1cm.
send the positive signal to every 1st, 5th, 9th, etc strip.
send the negative signal to every 3rd, 7th, 11th, etc strip.
the inbetween 2nd, 4th, 6th, 8th, 10th, etc strips send voltage reference (i.e. ground or 2.5V)
on subsquent phases, increment thoae numbers by 1.
the tokens with have receiver plates (or contacts) on the 6 equidistamt opposite corners.
@ericfont
ericfont / circuit-20260418-2013.svg
Created April 19, 2026 00:11
test circuit capacitively couple without common ground reference.
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@ericfont
ericfont / keyd-unicode-musical-symbols.conf
Last active March 24, 2026 23:22
keyd unicode musical symbols configuration file for a second USB keyboard
[ids]
# put the USB id code of your secondary keyboard to map
# found by running 'sudo keyd monitor'
XXXX:XXXX:XXXXXXXX
[main]
#boxed letters 🅰🅱🅲🅳🅸🆅
a = macro(C-S-u 1 f 1 7 0 enter)
b = macro(C-S-u 1 f 1 7 1 enter)
@ericfont
ericfont / circuit-20260317-1232.svg
Created March 17, 2026 16:31
last zero crossing of derivative of peak gives time when peak occurs
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@ericfont
ericfont / circuit-20260317-0204.svg
Created March 17, 2026 06:02
simple passive diode negative and positive peak detector
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@ericfont
ericfont / circuit-20260306-1554.svg
Created March 6, 2026 20:52
run device from solar while only use battery if not enough solar
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@ericfont
ericfont / circuit-20260306-0313.svg
Created March 6, 2026 08:13
possible solar top-up charging of two nimh in series
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@ericfont
ericfont / circuit-20260103-1511.svg
Created January 3, 2026 20:10
lowpass filtering LC ladder string
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