Eric Fontaine ericfont
ericfont
/ phantom-biasing-resistor-noise-test.asc
Created
September 28, 2025 15:08
phantom-biasing-resistor-noise-test.asc
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| Version 4.1 | |
| SHEET 1 880 680 | |
| WIRE -80 192 -192 192 | |
| WIRE 48 192 -80 192 | |
| WIRE 160 192 112 192 | |
| WIRE 224 192 160 192 | |
| WIRE -192 384 -192 352 | |
| WIRE -80 384 -192 384 | |
| WIRE 48 384 -80 384 | |
| WIRE 160 384 112 384 |
ericfont
/ circuit-20250925-1844.svg
Created
September 25, 2025 22:43
dickson multiplier in parallel to generate strong +48v
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ericfont
/ circuit-20250924-2246.svg
Created
September 25, 2025 02:46
series of charge-pump voltage doublers
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ericfont
/ circuit-20250917-1600.svg
Last active
September 25, 2025 04:17
CMOS Dickson charge pump to produce ~48v phantom power from ~5v USB power
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ericfont
/ circuit-20250806-0153.svg
Created
August 6, 2025 05:54
Use "offset binary" integrator for DAC to allow for negative voltages as well as postiive
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ericfont
/ circuit-20250720-0016.svg
Created
July 20, 2025 04:15
use sampled feedback from comparative to get close enough to some reference voltage
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ericfont
/ non-ideal-behavior-when-discharge-capacitor_with-additional-parasitic-capacitace.asc
Created
July 13, 2025 04:43
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| Version 4.1 | |
| SHEET 1 1096 680 | |
| WIRE 160 -48 96 -48 | |
| WIRE 208 -48 160 -48 | |
| WIRE 96 -32 96 -48 | |
| WIRE 96 48 96 32 | |
| WIRE 208 96 208 -48 | |
| WIRE 208 96 176 96 | |
| WIRE 32 144 -48 144 | |
| WIRE 112 144 112 96 |
ericfont
/ gist:cce54823c2511a7d33d9d2e3a81246f5
Created
July 7, 2025 05:32
u-law approximation with power law y=A*(x)^B+C-D*x
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| https://curve.fit/GAJQV0Mp/html/20250707001045 | |
| PARAMETER NOTE VALUE ERROR | |
| A -- 2.1987808177e+02 4.9690294198e-01 | |
| B -- 6.0225301451e+00 1.7954978476e-02 | |
| C -- -8.4861669965e+00 4.2398472030e-01 | |
| D -- -4.2598255040e+01 9.2674646686e-01 | |
| SSR = 8.78e+01 |
ericfont
/ circuit-20250703-0245.svg
Created
July 3, 2025 06:45
rearrange for parallel calculation of comparison and buffer, storing directly into capacitor instead of relying on a Flip Flop
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ericfont
/ circuit-20250702-1845.svg
Last active
July 2, 2025 22:47
3-inverters chained in loop necessarily oscillates
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