Version 4
SHEET 1 1036 680
WIRE 496 64 272 64
WIRE 784 64 624 64
WIRE 784 96 784 64
WIRE 784 96 736 96
WIRE 816 96 784 96
WIRE 496 128 496 64
WIRE 736 128 736 96
WIRE 624 160 624 64
WIRE 432 176 400 176
WIRE 816 176 816 96
WIRE 816 176 800 176
WIRE 400 192 400 176
WIRE 816 208 816 176
WIRE 496 240 496 224
WIRE 496 240 400 240
WIRE 496 256 496 240
WIRE 624 272 624 240
WIRE 272 288 272 64
WIRE 288 288 272 288
WIRE 368 288 352 288
WIRE 928 288 928 272
WIRE 928 288 880 288
WIRE 400 304 400 240
WIRE 432 304 400 304
WIRE 736 320 736 224
WIRE 736 320 688 320
WIRE 864 320 736 320
WIRE 928 320 928 288
WIRE 160 384 160 320
WIRE 176 384 160 384
WIRE 272 384 272 288
WIRE 272 384 256 384
WIRE 288 384 272 384
WIRE 368 400 368 288
WIRE 368 400 352 400
WIRE 416 400 368 400
WIRE 496 400 496 352
WIRE 624 400 624 368
WIRE 624 400 496 400
WIRE 784 400 624 400
WIRE 864 400 864 320
WIRE 288 416 256 416
WIRE 864 416 864 400
WIRE 256 512 256 416
FLAG 400 192 0
FLAG 816 208 0
FLAG 880 288 0
FLAG 928 192 V9
FLAG 320 368 V9
FLAG 256 512 0
FLAG 160 240 0
FLAG 928 400 Vneg
FLAG 320 432 Vneg
FLAG 864 496 Vneg
SYMBOL npn 432 128 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL npn 432 256 R0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL npn 688 272 M0
SYMATTR InstName Q4
SYMATTR Value 2N3904
SYMBOL npn 800 128 M0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL res 608 144 R0
SYMATTR InstName R-meter
SYMATTR Value 750
SYMBOL Opamps\\LT1006A 320 336 R0
SYMATTR InstName U1
SYMBOL voltage 928 176 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 35 44 Left 0
WINDOW 3 38 62 Left 0
SYMATTR InstName V1
SYMATTR Value 3.6
SYMBOL res 512 384 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 2k2
SYMBOL res 880 384 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL res 848 400 R0
SYMATTR InstName R4
SYMATTR Value 44k7
SYMBOL res 272 368 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap 352 272 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 330p
SYMBOL voltage 160 336 R180
WINDOW 0 -57 77 Left 0
WINDOW 3 -45 58 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V-in
SYMATTR Value 2
SYMBOL voltage 928 304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
WINDOW 0 41 41 Left 0
WINDOW 3 42 58 Left 0
SYMATTR InstName V2
SYMATTR Value 5.4
TEXT 904 72 Left 0 !.op
TEXT 904 96 Left 0 !;tran 0 1 0
TEXT 296 472 Left 0 ;Translinear analog squarer for power measurement, see KD1JV page or QQ Fall, 09.\nTransistors should be an array, not individual transistors, for matching.  Circuit doesn't\nshow LM317 for single supply operation used by Steve Weber but voltages are the same.\nNote Iy flows through Q1 & Q3 and is equal to V-in / R1.  Ix flows through Q4 and meter\n and Iu through Q2. Relationship is\n \n(Iy)^2 = Ix * Iu\n \nNote Iu is a constant current, set by R4 and V-neg.