Thnx but the the damm circuit still will not work on pspice...I put in some dc power supplies fot the +/-15 v needed fot the op-amps but still i get a ton of errors
new netlist source NEW
X_U2 N01668 GND_POWER N01551 N01554 N01678 LM318
X_U3 GND_POWER N01823 N01560 N01557 N01665 LF411
V_V1 N01560 GND_POWER 15Vdc
V_V2 GND_POWER N01557 -15Vdc
V_V3 GND_POWER N01554 -15Vdc
V_V4 N01551 GND_POWER 15Vdc
C_C1 N01823 N01665 1n
R_R4 N01681 N01823 {1k*0.5+.001}
R_R1 N01665 N01668 10k
R_R2 N01678 N01681 560
R_R3 N01668 N01681 10k
the pspice error
--------------- Simulation Profile: SCHEMATIC1-again1 ---------------
Simulation running...
** circuit file for profile: again1
Reading and checking circuit
Circuit read in and checked, no errors
Calculating bias point for Transient Analysis
Starting power supply stepping
Convergence problem in transient bias point calculation
These voltages failed to converge:
V(N01560) = -1.8516e+008 / -2.09455e+008
V(GND_POWER) = -1.8516e+008 / -2.09455e+008
V(N01557) = -1.8516e+008 / -2.09455e+008
V(N01554) = -1.8516e+008 / -2.09455e+008
V(N01551) = -1.8516e+008 / -2.09455e+008
5 of 32 errors shown. See Additional Info for complete list...
These supply currents failed to converge:
I(X_U2.egnd) = 0.0765222 / 0.0069206
I(X_U3.egnd) = 0.0551153 / 0.0326354
I(X_U2.vb) = -3.18479e-005 / -2.39829e-005
I(X_U2.vlim) = 0.0230456 / 0.0225084
I(X_U2.vlp) = 5.98241e-006 / -2.19366e-007
5 of 11 errors shown. See Additional Info for complete list...
These devices failed to converge:
X_U2.dlp
X_U3.dln
X_U2.fb
X_U3.fb
X_U3.j1
5 of 7 errors shown. See Additional Info for complete list...
Discontinuing simulation due to convergence problem
Unable to calculate bias point
See output file for details
Simulation complete
Reading and checking circuit
Circuit read in and checked, no errors
As there are no errors what can be wrong?