Version 4
SHEET 1 1220 680
WIRE -96 -272 -192 -272
WIRE 80 -272 -96 -272
WIRE -96 -192 -96 -272
WIRE 192 -192 80 -192
WIRE 80 -144 80 -192
WIRE 192 -96 192 -192
WIRE -608 -64 -608 -96
WIRE -96 -48 -96 -112
WIRE 80 -48 80 -80
WIRE 80 -48 -96 -48
WIRE 80 -16 80 -48
WIRE -96 16 -96 -48
WIRE 80 80 80 48
WIRE 192 80 192 -16
WIRE 192 80 80 80
WIRE -608 96 -608 16
WIRE -96 160 -96 96
WIRE 0 160 -96 160
WIRE 80 160 0 160
WIRE 0 192 0 160
FLAG -608 96 0
FLAG -608 -96 U_q
FLAG -192 -272 U_q
FLAG 0 192 0
SYMBOL voltage -608 -80 R0
WINDOW 3 -65 58 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value 3.3
SYMATTR InstName V1
SYMBOL res 64 -288 R0
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL res -112 -208 R0
SYMATTR InstName R3
SYMATTR Value {R_vari_1}
SYMBOL res 96 176 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R4
SYMATTR Value 100k
SYMBOL diode 64 -144 R0
WINDOW 0 42 26 Left 2
SYMATTR InstName D1
SYMBOL diode 64 -16 R0
SYMATTR InstName D2
SYMBOL res 176 -112 R0
SYMATTR InstName R
SYMATTR Value 10k
SYMBOL res -112 0 R0
SYMATTR InstName R1
SYMATTR Value {R_vari_2}
TEXT -648 152 Left 2 !.op
TEXT -488 -368 Left 2 ;Spannungs-Balanceeinstellung mit Poti
TEXT -464 -312 Left 2 ;http://www.mikrocontroller.net/topic/284936#new
TEXT -704 -256 Left 2 !.step param R_vari_1 list   1k 2k 5k 8k 9k
TEXT -704 -216 Left 2 !.step param R_vari_2 list   9k 8k 5k 2k 1k
TEXT -704 -168 Left 2 ;.tran 0 18 0 0.1m startup