Add transistor cut-off to control voltage

Simulations/input-stages.asc

@@ -148,6 +148,9 @@ WIRE 2032 992 1904 992
 WIRE 2160 992 2112 992
 WIRE 2320 1008 2224 1008
 WIRE 2448 1008 2400 1008
+WIRE 3744 1072 3744 1040
+WIRE 3744 1072 3696 1072
+WIRE 3808 1072 3744 1072
 WIRE 2032 1104 1904 1104
 WIRE 2160 1104 2160 992
 WIRE 2160 1104 2112 1104
@@ -157,9 +160,13 @@ WIRE 2304 1104 2224 1104
 WIRE 2448 1120 2448 1008
 WIRE 2448 1120 2368 1120
 WIRE 2560 1120 2448 1120
+WIRE 3696 1120 3696 1072
 WIRE 2304 1136 2272 1136
 WIRE 2272 1168 2272 1136
+WIRE 3808 1216 3808 1072
 WIRE 592 1232 496 1232
+WIRE 3696 1232 3696 1200
+WIRE 3760 1232 3696 1232
 WIRE 2032 1248 1904 1248
 WIRE 2160 1248 2112 1248
 WIRE 496 1280 496 1232
@@ -169,6 +176,7 @@ WIRE 2160 1360 2112 1360
 WIRE 496 1376 496 1360
 WIRE 2320 1376 2224 1376
 WIRE 2448 1376 2400 1376
+WIRE 3808 1424 3808 1312
 WIRE 2032 1472 1904 1472
 WIRE 2160 1472 2160 1360
 WIRE 2160 1472 2112 1472
@@ -180,13 +188,23 @@ WIRE 2448 1488 2368 1488
 WIRE 2560 1488 2448 1488
 WIRE 2304 1504 2272 1504
 WIRE 2272 1536 2272 1504
+WIRE 3488 1552 3344 1552
+WIRE 3536 1552 3488 1552
+WIRE 3808 1552 3808 1504
+WIRE 3808 1552 3616 1552
+WIRE 3856 1552 3808 1552
 WIRE 2032 1632 1904 1632
 WIRE 2160 1632 2112 1632
+WIRE 3696 1632 3696 1232
+WIRE 3488 1712 3488 1552
+WIRE 3520 1712 3488 1712
+WIRE 3648 1712 3600 1712
 WIRE 2032 1744 1904 1744
 WIRE 2160 1744 2160 1632
 WIRE 2160 1744 2112 1744
 WIRE 2320 1760 2224 1760
 WIRE 2448 1760 2400 1760
+WIRE 3696 1824 3696 1728
 WIRE 2032 1856 1904 1856
 WIRE 2160 1856 2160 1744
 WIRE 2160 1856 2112 1856
@@ -277,6 +295,10 @@ FLAG 3680 624 V+
 FLAG 3680 688 V-
 FLAG 3392 752 0
 FLAG 3856 896 Aux2LCV
+FLAG 3344 1552 Aux2RCVRaw
+FLAG 3856 1552 Aux2RCV
+FLAG 3744 1040 V+
+FLAG 3696 1904 0
 SYMBOL voltage 144 80 R0
 SYMATTR InstName V1
 SYMATTR Value 12
@@ -512,6 +534,32 @@ SYMATTR InstName D4
 SYMBOL res 3776 768 R0
 SYMATTR InstName R36
 SYMATTR Value 10k
+SYMBOL res 3632 1536 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R37
+SYMATTR Value 1k
+SYMBOL res 3792 1408 R0
+SYMATTR InstName R38
+SYMATTR Value 2k
+SYMBOL res 3680 1104 R0
+SYMATTR InstName R39
+SYMATTR Value 10k
+SYMBOL res 3616 1696 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R40
+SYMATTR Value 100
+SYMBOL pmos 3760 1312 M180
+SYMATTR InstName M1
+SYMBOL nmos 3648 1632 R0
+SYMATTR InstName M2
+SYMATTR Value 2N7002
+SYMBOL voltage 3696 1808 R0
+WINDOW 123 0 0 Left 0
+WINDOW 39 0 0 Left 0
+SYMATTR InstName V6
+SYMATTR Value .2
 TEXT 304 -184 Left 2 ;Pan CV in
 TEXT 608 -192 Left 2 ;CV Level
 TEXT 480 -384 Left 2 ;Put ESD protection here