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Posted to alt.engineering.electrical,sci.electronics.design,sci.electronics.repair,rec.audio.tech
John Fields John Fields is offline
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Default Mixing 4 audio channels to 3?

On Thu, 10 Nov 2011 00:51:03 -0800, DaveC wrote:

Exactly. Much easier than all these halved supplies, coupling caps and
multiple grounds.

d


So, how -- exactly -- would you create that negative voltage?


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WIRE -32 80 -176 80
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WIRE -32 144 -80 144
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WIRE -32 208 -80 208
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WIRE 512 208 464 208
WIRE 624 208 576 208
WIRE 672 208 624 208
WIRE 784 208 736 208
WIRE 880 208 784 208
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WIRE 224 272 192 272
WIRE 880 288 880 208
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WIRE 224 336 224 272
WIRE 224 336 -176 336
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SYMBOL Misc\\NE555 80 176 M0
SYMATTR InstName U1
SYMBOL voltage -176 368 M0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 16
SYMBOL res 896 272 M0
SYMATTR InstName R3
SYMATTR Value 1000
SYMBOL cap 336 400 M0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL diode 736 224 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL diode 640 352 M0
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL polcap 800 352 M0
SYMATTR InstName C4
SYMATTR Value 1µ
SYMBOL polcap 512 192 M90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 1µ
SYMBOL res 304 224 R0
SYMATTR InstName R1
SYMATTR Value 10k
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SYMATTR Value 100
TEXT -40 536 Right 2 !.tran .01 startup uic

--
JF