Trouble simulating a Wein Bridge Oscillator in LTspice

[dave.harper]

I'm trying to simulate a Wein Bridge Oscillator in LTspice (I'm new to
it), and haven't managed to get it to work. I've simulated a few
other oscillators without any problems, but for some reason this one
is not oscillating. Maybe it has something to do with the way I set
up the op amp (or the one I selected)? Below is the .asc file I've
used to put it together. Any insight is greatly appreciated!

Thanks!
Dave

Version 4
SHEET 1 928 680
WIRE 48 -320 -64 -320
WIRE 176 -240 48 -240
WIRE 64 -208 -144 -208
WIRE -144 -192 -144 -208
WIRE 64 -192 64 -208
WIRE -64 -176 -64 -320
WIRE 32 -176 -64 -176
WIRE 176 -160 176 -240
WIRE 176 -160 96 -160
WIRE 32 -144 -16 -144
WIRE 64 -80 64 -128
WIRE 176 -80 176 -160
WIRE -144 -64 -144 -112
WIRE 176 32 176 0
WIRE -16 112 -16 -144
WIRE 176 112 176 96
WIRE 176 112 -16 112
WIRE 176 128 176 112
WIRE -16 144 -16 112
WIRE -16 240 -16 208
WIRE 80 240 -16 240
WIRE 176 240 176 208
WIRE 176 240 80 240
WIRE 80 272 80 240
FLAG -144 -64 0
FLAG 64 -80 0
FLAG 80 272 0
SYMBOL voltage -144 -208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -66 54 Left 0
WINDOW 3 47 51 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL res 32 -336 R0
SYMATTR InstName R1
SYMATTR Value 20k
SYMBOL cap 160 32 R0
SYMATTR InstName C1
SYMATTR Value .01µ
SYMBOL res 160 112 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL cap -32 144 R0
SYMATTR InstName C2
SYMATTR Value .01µ
SYMBOL res 160 -96 R0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL Opamps\\LT1024 64 -224 R0
SYMATTR InstName U1
TEXT -104 -360 Left 0 !.tran 0 .005 0 .000001 startup

 

[Helmut Sennewald]

I'm trying to simulate a Wein Bridge Oscillator in LTspice (I'm new to
it), and haven't managed to get it to work. I've simulated a few
other oscillators without any problems, but for some reason this one
is not oscillating. Maybe it has something to do with the way I set
up the op amp (or the one I selected)? Below is the .asc file I've
used to put it together. Any insight is greatly appreciated!

Thanks!
Dave


Hello Dave,

When you run circuits with single supply, you jave to
choose the right opamp and you have to provide a
reference to VCC/2. Please try my example below.

http://www.ecircuitcenter.com/Circuits/opwien/opwien.htm

Best regards,
Helmut


Version 4
SHEET 1 928 680
WIRE 176 -480 128 -480
WIRE 272 -480 240 -480
WIRE 128 -400 128 -480
WIRE 176 -400 128 -400
WIRE 272 -400 272 -480
WIRE 272 -400 240 -400
WIRE -128 -304 -160 -304
WIRE -16 -304 -48 -304
WIRE 16 -304 -16 -304
WIRE 128 -304 128 -400
WIRE 128 -304 96 -304
WIRE 160 -304 128 -304
WIRE 272 -304 272 -400
WIRE 272 -304 240 -304
WIRE 96 -192 96 -208
WIRE -16 -176 -16 -304
WIRE 64 -176 -16 -176
WIRE 224 -160 128 -160
WIRE 272 -160 272 -304
WIRE 272 -160 224 -160
WIRE 64 -144 -16 -144
WIRE 272 -112 272 -160
WIRE -384 -80 -384 -128
WIRE -336 -80 -384 -80
WIRE -224 -80 -256 -80
WIRE -144 -80 -144 -128
WIRE -144 -80 -224 -80
WIRE 96 -80 96 -128
WIRE -144 -48 -144 -80
WIRE -384 -32 -384 -80
WIRE -224 -32 -224 -80
WIRE 272 16 272 -32
WIRE -384 80 -384 48
WIRE -224 80 -224 48
WIRE -144 80 -144 16
WIRE -16 112 -16 -144
WIRE 112 112 -16 112
WIRE 272 112 272 80
WIRE 272 112 112 112
WIRE 272 128 272 112
WIRE -16 144 -16 112
WIRE -16 240 -16 208
WIRE -16 240 -112 240
WIRE 272 240 272 208
WIRE 272 240 -16 240
FLAG -384 80 0
FLAG 96 -80 0
FLAG -384 -128 +5V
FLAG 96 -208 +5V
FLAG -112 240 +2.5V
FLAG -160 -304 +2.5V
FLAG 112 112 in1
FLAG 224 -160 out
FLAG -144 80 0
FLAG -224 80 0
FLAG -144 -128 +2.5V
SYMBOL voltage -384 -48 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 -66 54 Left 0
WINDOW 3 47 51 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL res 0 -288 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R1
SYMATTR Value 12k
SYMBOL cap 256 16 R0
SYMATTR InstName C1
SYMATTR Value .01µ
SYMBOL res 256 112 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL cap -32 144 R0
SYMATTR InstName C2
SYMATTR Value .01µ
SYMBOL res 256 -128 R0
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL Opamps\\LT1797 96 -224 R0
SYMATTR InstName U3
SYMBOL res -144 -288 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res 144 -288 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL diode 176 -384 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL diode 240 -496 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL res -352 -64 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 0 56 VBottom 0
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL res -240 -48 R0
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL polcap -160 -48 R0
SYMATTR InstName C3
SYMATTR Value 10µ
TEXT -440 -464 Left 0 !.tran 0 10m 0 1u
TEXT -440 -424 Left 0 !.ic V(in1)=2.7
TEXT -440 -512 Left 0 ;Wien Oscillator With Single Supply

 

[dave.harper]

I'm trying to simulate a Wein Bridge Oscillator in LTspice (I'm new to
it), and haven't managed to get it to work.  I've simulated a few
other oscillators without any problems, but for some reason this one
is not oscillating.  Maybe it has something to do with the way I set
up the op amp  (or the one I selected)?  Below is the .asc file I've
used to put it together.  Any insight is greatly appreciated!

Thanks!
Dave

Hello Dave,

When you run circuits with single supply, you jave to
choose the right opamp and you have to provide a
reference to VCC/2. Please try my example below.

http://www.ecircuitcenter.com/Circuits/opwien/opwien.htm

Best regards,
Helmut

Fantastic, thanks! It works like a charm. I'll be studying this and
probably breadboarding it tonight.

Thanks for the help!
Dave