On Tue, 23 Jun 2009 02:53:32 -0700 (PDT), Centron System Solutions wrote:
--- I don't think so.
Here it is in ASCII: (view in Courier)
470R 680nF ACHOT>--[F1]--[R1]--[C3]--+---+---[D3>]---+-->>--+-> +4.4V | |K |+ | | [D1] 330µF[C1] [RL1]147R | | | | ACNEUT>-------------------|---+-----------+-->>--+-> GND | |K | | | [D2] 330µF[C2] [RL2]1470R | | | | +---+---[>--+-> -4.4Vnote that when the output of C3 goes positive, the junction of D2 and D4 does too.
Now, since the anode of D2 goes to neutral, it'll conduct, with the result being that the output of C3 will only be one diode drop above GND!
the same thing happens when it goes negative, with D1 steering the signal to GND.
Here:
Version 4 SHEET 1 880 680 WIRE 160 96 96 96 WIRE 304 96 240 96 WIRE 400 96 368 96 WIRE 448 96 400 96 WIRE 560 96 448 96 WIRE 656 96 624 96 WIRE 784 96 656 96 WIRE 96 128 96 96 WIRE 784 128 784 96 WIRE 448 144 448 96 WIRE 656 144 656 96 WIRE 96 240 96 208 WIRE 448 240 448 208 WIRE 448 240 96 240 WIRE 656 240 656 208 WIRE 784 240 784 208 WIRE 784 240 656 240 WIRE 448 256 448 240 WIRE 656 256 656 240 WIRE 656 256 448 256 WIRE 784 272 784 240 WIRE 448 288 448 256 WIRE 656 288 656 256 WIRE 96 320 96 240 WIRE 400 384 400 96 WIRE 448 384 448 352 WIRE 448 384 400 384 WIRE 560 384 448 384 WIRE 656 384 656 352 WIRE 656 384 624 384 WIRE 784 384 784 352 WIRE 784 384 656 384 FLAG 96 320 0 SYMBOL voltage 96 112 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value SINE(0 170 60) SYMBOL res 256 80 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 470 SYMBOL cap 368 80 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value 6.8e-7 SYMBOL zener 464 208 R180 WINDOW 0 -43 36 Left 0 WINDOW 3 -133 1 Left 0 SYMATTR InstName D1 SYMATTR Value BZX84C6V2L SYMATTR Description Diode SYMATTR Type diode SYMBOL diode 560 112 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D4 SYMATTR Value MURS120 SYMBOL cap 640 144 R0 SYMATTR InstName C2 SYMATTR Value 330e-6 SYMBOL cap 640 288 R0 SYMATTR InstName C3 SYMATTR Value 330e-6 SYMBOL res 768 112 R0 SYMATTR InstName R2 SYMATTR Value 147 SYMBOL res 768 256 R0 SYMATTR InstName R3 SYMATTR Value 1470 SYMBOL zener 464 352 R180 WINDOW 0 -38 31 Left 0 WINDOW 3 -139 68 Left 0 SYMATTR InstName D2 SYMATTR Value BZX84C6V2L SYMATTR Description Diode SYMATTR Type diode SYMBOL diode 624 368 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D3 SYMATTR Value MURS120 TEXT 112 272 Left 0 !.tran 1 uic
This is the obvious fix:
470R 680nF ACHOT>--[F1]--[R1]--[C3]--+-[D3>]-+---------+-->>--+-> +4.4V | |K |+ | | [D1] 330µF[C1] [RL1]147R | | | | ACNEUT>-------------------|-------+---------+-->>--+-> GND | |K |+ | | [D2] 330µF[C2] [RL2]1470R | | | | +-[>--+-> -4.4VBut then, even after you fix the problem there's a low outout voltage and high ripple on the positive supply:
Version 4 SHEET 1 964 680 WIRE 160 96 96 96 WIRE 304 96 240 96 WIRE 400 96 368 96 WIRE 496 96 400 96 WIRE 608 96 560 96 WIRE 688 96 608 96 WIRE 816 96 688 96 WIRE 96 128 96 96 WIRE 816 128 816 96 WIRE 608 144 608 96 WIRE 688 144 688 96 WIRE 96 240 96 208 WIRE 608 240 608 208 WIRE 608 240 96 240 WIRE 688 240 688 208 WIRE 816 240 816 208 WIRE 816 240 688 240 WIRE 608 256 608 240 WIRE 688 256 688 240 WIRE 688 256 608 256 WIRE 816 272 816 240 WIRE 608 288 608 256 WIRE 688 288 688 256 WIRE 96 320 96 240 WIRE 400 384 400 96 WIRE 496 384 400 384 WIRE 608 384 608 352 WIRE 608 384 560 384 WIRE 688 384 688 352 WIRE 688 384 608 384 WIRE 816 384 816 352 WIRE 816 384 688 384 FLAG 96 320 0 SYMBOL voltage 96 112 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value SINE(0 170 60) SYMBOL res 256 80 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 470 SYMBOL cap 368 80 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value 6.8e-7 SYMBOL diode 496 112 R270 WINDOW 0 76 29 VTop 0 WINDOW 3 66 26 VBottom 0 SYMATTR InstName D4 SYMATTR Value MURS120 SYMBOL cap 672 144 R0 SYMATTR InstName C2 SYMATTR Value 330e-6 SYMBOL cap 672 288 R0 SYMATTR InstName C3 SYMATTR Value 330e-6 SYMBOL res 800 112 R0 SYMATTR InstName R2 SYMATTR Value 147 SYMBOL res 800 256 R0 SYMATTR InstName R3 SYMATTR Value 1470 SYMBOL zener 624 352 R180 WINDOW 0 46 30 Left 0 WINDOW 3 35 69 Left 0 SYMATTR InstName D2 SYMATTR Value 1N750 SYMATTR Description Diode SYMATTR Type diode SYMBOL diode 560 368 R90 WINDOW 0 70 33 VBottom 0 WINDOW 3 72 34 VTop 0 SYMATTR InstName D3 SYMATTR Value MURS120 SYMBOL zener 624 208 R180 WINDOW 0 46 30 Left 0 WINDOW 3 35 69 Left 0 SYMATTR InstName D1 SYMATTR Value 1N750 SYMATTR Description Diode SYMATTR Type diode TEXT 112 272 Left 0 !.tran 1 uic
So, what to do???
More later... :-)
JF