直流稳压电源提供电路工作电压，经过发光二极管可知电路是否通路；OP07作为一个主控芯片，实现输入信号放大功能；输入信号经过芯片会被放大，第一级差放电路的反馈网络形成了虚断，使输入阻抗Ri→∞；输入信号进入第二级差分电路，调节滑动变阻器可改变整个电路的增益；信号输出到示波器。
输入信号分别从两个OP07同相输入，电路出现虚断现象，因而输入电路等于0，所以输入阻抗Ri→∞。
http://easysim.21ic.com/simulator#677
Simulation completed in 68.0e-3 seconds.
DC Operating Point Information
Node Voltages:
net1000 0
net1002 0
xu1.3 0
xu1.4 0
xu1.5 0
net1004 0
net1001 0
net1003 0
xu2.3 0
xu2.4 0
xu2.5 0
net1005 0
net1006 0
net1009 0
net1007 0
xu3.3 0
xu3.4 0
xu3.5 0
Node Currents:
Circuit: dd simulation
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
No. of Data Rows : 1
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
No. of Data Rows : 1
No. of Data Rows : 11
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
Initial Transient Solution
--------------------------
Node Voltage
---- -------
net1000 0
net1002 0
xu1.3 0
xu1.4 0
xu1.5 0
net1004 0
net1001 0
net1003 0
xu2.3 0
xu2.4 0
xu2.5 0
net1005 0
net1006 0
net1009 0
net1007 0
xu3.3 0
xu3.4 0
xu3.5 0
e.xu3.ebuffer#branch 0
e.xu3.egain#branch 0
e.xu2.ebuffer#branch 0
e.xu2.egain#branch 0
e.xu1.ebuffer#branch 0
e.xu1.egain#branch 0
No. of Data Rows : 311
Total CPU time: 0.038 seconds.
CPU time since last call: 0.038 seconds.
Total DRAM available = 7861.281250 MB.
DRAM currently available = 672.914062 MB.
Total ngspice program size = 13.575195 MB.
Resident set size = 1.732422 MB.
Shared ngspice pages = 536.000 kB.
Text (code) pages = 1.222656 MB.
Stack = 0 bytes.
Library pages = 6.000000 MB.
0 page faults, 0 vol + 6 invol = 6 context switches.
Number of lines in the deck = 52
Netlist loading time = 0
Netlist parsing time = 0
Nominal temperature = 27
Operating temperature = 27
Total iterations = 629
Transient iterations = 620
Circuit Equations = 25
Circuit original non-zeroes = 69
Circuit fill-in non-zeroes = 21
Circuit total non-zeroes = 90
Transient timepoints = 311
Accepted timepoints = 311
Rejected timepoints = 0
Total analysis time = 0.005999
Matrix load time = 0.001
Matrix synchronize time = 0
Matrix reorder time = 0
Matrix factor time = 0
Matrix solve time = 0.001999
Transient analysis time = 0.004999
Transient load time = 0.001
Transient sync time = 0
Transient factor time = 0
Transient solve time = 0.001999
Transient trunc time = 0
Transient iters per point = 0
AC analysis time = 0
AC load time = 0
AC sync time = 0
AC factor time = 0
AC solve time = 0
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