* source SWITCHSENSE
V_V3         N15150 0  
+PULSE 0 5 0 1ns 1ns .5 1
V_V1         N14754 0 5Vdc
R_R1         VC N14754  5k  
V_V4         N15130 0  
+PULSE 0 5 0 1ns 1ns .25 1
R_R2         VB VC  10k  
R_R3         VA VB  10k  
R_R4         0 VA  5k  
R_R5         V3 VC  10k  
R_R6         N15130 V3  1meg  
R_R7         V2 VB  10k  
R_R8         N15150 V2  1meg  
V_V2         N15172 0  
+PULSE 0 5 0 1ns 1ns .75 1
R_R9         V1 VA  10k  
R_R10         N15172 V1  1meg