This was suggested by part of Jim's "VoltageIndicator_NoHang.pdf" circuit.
Cute, possibly even useful somewhere.
Version 4 SHEET 1 880 680 WIRE 96 -192 -176 -192 WIRE 96 -112 96 -192 WIRE -176 -96 -176 -192 WIRE 96 16 96 -32 WIRE 256 16 96 16 WIRE 368 16 256 16 WIRE 432 16 368 16 WIRE 96 64 96 16 WIRE -176 96 -176 -16 WIRE 256 160 256 16 WIRE 96 208 96 144 WIRE 192 208 96 208 WIRE -80 272 -176 272 WIRE 96 272 96 208 WIRE 96 272 -16 272 WIRE 256 320 256 256 WIRE -176 368 -176 272 WIRE 96 368 96 272 WIRE -176 512 -176 448 WIRE 96 512 96 432 FLAG 256 320 0 FLAG -176 96 0 FLAG -176 512 0 FLAG 96 512 0 FLAG 368 16 OUT SYMBOL res 80 -128 R0 WINDOW 0 -67 39 Left 2 WINDOW 3 -64 76 Left 2 SYMATTR InstName R1 SYMATTR Value 1K SYMBOL res 80 48 R0 WINDOW 0 -60 37 Left 2 WINDOW 3 -62 73 Left 2 SYMATTR InstName R2 SYMATTR Value 6K SYMBOL pnp 192 256 M180 WINDOW 0 147 68 Left 2 WINDOW 3 123 32 Left 2 SYMATTR InstName Q1 SYMATTR Value 2N4403 SYMBOL voltage -176 -112 R0 WINDOW 0 61 42 Left 2 WINDOW 3 67 81 Left 2 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL voltage -176 352 R0 WINDOW 0 22 115 Left 2 WINDOW 3 -26 216 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value PULSE(0 3.3 0 10n 10n 8m 10m 10) SYMBOL cap 80 368 R0 WINDOW 0 74 19 Left 2 WINDOW 3 74 50 Left 2 SYMATTR InstName C1
SYMBOL schottky -16 256 R90 WINDOW 0 -58 26 VBottom 2 WINDOW 3 -44 29 VTop 2 SYMATTR InstName D1 SYMATTR Value MBR0540 SYMATTR Description Diode SYMATTR Type diode TEXT 287 -96 Left 2 !.tran 50m TEXT -144 -304 Left 2 ;Linear ramp using PNP shunt current source/buffer TEXT -24 -248 Left 2 ;J Larkin July 29, 2014