On Fri, 04 Mar 2011 08:55:23 +0100, Jeroen Belleman wrote:
--- No, he's right:
and, the pudding:
Version 4 SHEET 1 1380 680 WIRE -496 -48 -544 -48 WIRE -384 -48 -416 -48 WIRE 432 -48 272 -48 WIRE 752 -48 624 -48 WIRE -464 0 -896 0 WIRE -464 16 -464 0 WIRE 656 16 624 16 WIRE 752 16 752 -48 WIRE -624 32 -752 32 WIRE -544 32 -544 -48 WIRE -544 32 -624 32 WIRE -496 32 -544 32 WIRE 272 32 272 -48 WIRE -384 48 -384 -48 WIRE -384 48 -432 48 WIRE 432 48 400 48 WIRE -752 64 -752 32 WIRE -624 64 -624 32 WIRE -496 64 -544 64 WIRE -80 64 -320 64 WIRE 128 96 64 96 WIRE -80 128 -208 128 WIRE 128 144 128 96 WIRE -896 160 -896 0 WIRE -752 160 -752 144 WIRE -624 160 -624 144 WIRE -464 160 -464 80 WIRE -320 160 -320 64 WIRE -208 160 -208 128 WIRE 272 160 272 112 WIRE 400 160 400 48 WIRE 752 160 752 96 WIRE -896 288 -896 240 WIRE -752 288 -752 240 WIRE -752 288 -896 288 WIRE -624 288 -624 240 WIRE -624 288 -752 288 WIRE -544 288 -544 64 WIRE -544 288 -624 288 WIRE -464 288 -464 240 WIRE -464 288 -544 288 WIRE -320 288 -320 240 WIRE -320 288 -464 288 WIRE -208 288 -208 240 WIRE -208 288 -320 288 WIRE 128 288 128 224 WIRE 128 288 -208 288 WIRE 272 288 272 240 WIRE 272 288 128 288 WIRE 400 288 400 240 WIRE 400 288 272 288 WIRE 656 288 656 16 WIRE 656 288 400 288 WIRE 752 288 752 240 WIRE 752 288 656 288 WIRE -896 352 -896 288 FLAG -896 352 0 SYMBOL Opamps\\LT1007 -464 -16 R0 SYMATTR InstName U1 SYMBOL voltage -464 256 R180 WINDOW 0 24 104 Left 0 WINDOW 3 24 16 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value 15 SYMBOL voltage -896 144 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V5 SYMATTR Value 15 SYMBOL voltage -752 144 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value SINE(0 1 100) SYMATTR InstName V2 SYMBOL voltage -624 144 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value SINE(0 1 10k) SYMATTR InstName V3 SYMBOL res -400 -64 R90 WINDOW 0 -34 57 VBottom 0 WINDOW 3 -31 57 VTop 0 SYMATTR InstName R4 SYMATTR Value 1000 SYMBOL res -736 160 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R2 SYMATTR Value 1000 SYMBOL res -608 160 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R3 SYMATTR Value 1000 SYMBOL SPECIALFUNCTIONS\\MODULATE -80 64 R0 WINDOW 0 37 -55 Left 0 WINDOW 3 55 119 Center 0 SYMATTR InstName A2 SYMATTR Value mark=10k space=0 SYMBOL voltage -208 144 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value SINE(0 1 100) SYMATTR InstName V6 SYMBOL voltage -320 144 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value 1 SYMATTR InstName V7 SYMBOL res 112 128 R0 SYMATTR InstName R5 SYMATTR Value 10k SYMBOL Optos\\4N25 528 16 R0 WINDOW 0 1 68 Center 0 WINDOW 3 1 98 Center 0 SYMATTR InstName U2 SYMBOL voltage 400 144 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value SINE(12 2 100) SYMATTR InstName V1 SYMBOL voltage 272 144 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V8 SYMATTR Value 15 SYMBOL res 288 128 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R1 SYMATTR Value 1000 SYMBOL voltage 752 144 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value SINE(1 1 10k) SYMATTR InstName V9 SYMBOL res 736 0 R0 SYMATTR InstName R6 SYMATTR Value 10k TEXT -880 312 Left 0 !.tran .1 TEXT -744 -120 Left 0 ;LINEAR SUMMATION TEXT -176 -120 Left 0 ;AMPLITUDE MODULATION TEXT 368 -128 Left 0 ;AMPLITUDE MODULATION
--- JF