[sdiy] voltage controlled slew with transistors

[René Schmitz]

oops, here is the right ltspice file.

--
synth at schmitzbits.de
http://schmitzbits.de
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Version 4
SHEET 1 1192 680
WIRE 144 -96 -96 -96
WIRE -96 -64 -96 -96
WIRE 144 -64 144 -96
WIRE 144 -64 80 -64
WIRE 208 -64 144 -64
WIRE 80 16 80 -64
WIRE 208 16 208 -64
WIRE 512 32 400 32
WIRE 704 32 576 32
WIRE 144 128 144 64
WIRE 208 128 208 112
WIRE 208 128 144 128
WIRE 400 128 400 32
WIRE 512 128 400 128
WIRE 80 144 80 112
WIRE 400 144 400 128
WIRE 400 144 80 144
WIRE 704 144 704 32
WIRE 704 144 576 144
WIRE 80 160 80 144
WIRE 208 160 208 128
WIRE 512 160 480 160
WIRE 480 192 480 160
WIRE -80 208 -224 208
WIRE 16 208 -80 208
WIRE 368 208 272 208
WIRE -80 240 -80 208
WIRE -224 256 -224 208
WIRE 368 272 368 208
WIRE 480 272 368 272
WIRE 528 272 480 272
WIRE 704 272 704 144
WIRE 704 272 608 272
WIRE 80 288 80 256
WIRE 144 288 80 288
WIRE 208 288 208 256
WIRE 208 288 144 288
WIRE -80 336 -80 320
WIRE 368 336 368 272
WIRE 144 368 144 288
WIRE -224 432 -224 336
WIRE 368 448 368 416
WIRE 144 512 144 448
WIRE -224 544 -224 512
FLAG 144 512 -12
FLAG 480 192 0
FLAG 368 448 0
FLAG -80 336 0
FLAG 544 112 +12
FLAG 544 176 -12
FLAG 80 -208 0
FLAG 208 -288 0
FLAG 80 -288 +12
FLAG 208 -208 -12
FLAG -224 544 0
FLAG -96 16 0
FLAG 480 432 0
SYMBOL npn 16 160 R0
WINDOW 0 16 115 Left 2
WINDOW 3 16 146 Left 2
SYMATTR InstName Q1
SYMATTR Value BC847C
SYMBOL npn 272 160 M0
WINDOW 0 14 117 Left 2
WINDOW 3 12 146 Left 2
SYMATTR InstName Q2
SYMATTR Value BC847C
SYMBOL current 144 368 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value 15ľ
SYMBOL cap 576 16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL res 352 320 R0
SYMATTR InstName R1
SYMATTR Value 220
SYMBOL res -96 224 R0
SYMATTR InstName R2
SYMATTR Value 220
SYMBOL res 624 256 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 47k
SYMBOL res -208 352 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R4
SYMATTR Value 47k
SYMBOL voltage 80 -304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage 208 -304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL voltage -224 416 R0
WINDOW 3 -399 58 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 5 0 1u 1u 500m 1000m)
SYMBOL Opamps\\LT1056 544 80 R0
SYMATTR InstName U1
SYMBOL pnp 144 112 R180
SYMATTR InstName Q3
SYMATTR Value BC857C
SYMBOL pnp 144 112 M180
SYMATTR InstName Q4
SYMATTR Value BC857C
SYMBOL voltage -96 -80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value 0.6
SYMBOL res 464 256 R0
SYMATTR InstName R5
SYMATTR Value 470k
SYMBOL voltage 480 336 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V5
SYMATTR Value 0.0
TEXT -354 594 Left 2 !.tran 5
TEXT 520 392 Left 2 ;offset