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Description:
This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly controlled from the sound card itself.
Parts List:
D1-D4: 1N4001 (4)
C1,C20: 1000u CAP (2)
C2,C11: 47u CAP (2)
C3,C5,C7,C8,C12,C14,C16,C17,C21,C22: 0.1u CAP (10)
C4,C6,C13,C15: 10u CAP (4)
C9,C10,C18,C19: 2200u CAP (4)
R1,R4,R9,R12: 1M RESISTOR (4)
R2,R6,R10,R14: 100k RESISTOR (4)
R3,R5,R11,R13: 1k RESISTOR (4)
R7,R8,R15,R16: 2R7 RESISTOR (4)
IC1: 7812 (1)
IC2,IC3: LM1778N (2)
SPK1,SPK2,SPK3,SPK4: 8R 2 Watt speakers (4)
Notes:
Construction is straight forward and is suitable for Verobaord. Overall gain is controlled by the ratio R14/R13 and R6/R5. Used with small hi-fi speakers the volume was too loud for my room so I reduced R14 and R6 to 33k. The zobel network formed by R7,C7,R8,C8,R15,C16,R16,C17 prevents instability which can happen with long speaker wires. The input impedance is high, 1M and if very long input cables are present could pick up noise. Screened cable should be used, in my case I used 10k resistors between points A & C, B & C, D & F, E & F. This provides a DC path to ground and higher noise immunity. If instability does occur, then you will notice sound distortion and the LM1877N will become hot to touch.
Connections:
The back of a sound blaster live card has colour coded 3.5mm stereo jacks. The image below shows a close up of the rear of my Sound Blaster Live card. As well as colour coding, each connector has an appropriate marking, for easy connectivity.
The normal output connector is green and the rear speaker connector is black. Creative provide utilities and sound mixer for use with Windows. Under Linux the utility Gamix can be used, which allows independent volume control for all channels.
Our other product:
Professional FM Radio Station Equipment Package
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es.fmuser.org
it.fmuser.org
fr.fmuser.org
de.fmuser.org
af.fmuser.org ->Afrikaans
sq.fmuser.org ->Albanian
ar.fmuser.org ->Arabic
hy.fmuser.org ->Armenian
az.fmuser.org ->Azerbaijani
eu.fmuser.org ->Basque
be.fmuser.org ->Belarusian
bg.fmuser.org ->Bulgarian
ca.fmuser.org ->Catalan
zh-CN.fmuser.org ->Chinese (Simplified)
zh-TW.fmuser.org ->Chinese (Traditional)
hr.fmuser.org ->Croatian
cs.fmuser.org ->Czech
da.fmuser.org ->Danish
nl.fmuser.org ->Dutch
et.fmuser.org ->Estonian
tl.fmuser.org ->Filipino
fi.fmuser.org ->Finnish
fr.fmuser.org ->French
gl.fmuser.org ->Galician
ka.fmuser.org ->Georgian
de.fmuser.org ->German
el.fmuser.org ->Greek
ht.fmuser.org ->Haitian Creole
iw.fmuser.org ->Hebrew
hi.fmuser.org ->Hindi
hu.fmuser.org ->Hungarian
is.fmuser.org ->Icelandic
id.fmuser.org ->Indonesian
ga.fmuser.org ->Irish
it.fmuser.org ->Italian
ja.fmuser.org ->Japanese
ko.fmuser.org ->Korean
lv.fmuser.org ->Latvian
lt.fmuser.org ->Lithuanian
mk.fmuser.org ->Macedonian
ms.fmuser.org ->Malay
mt.fmuser.org ->Maltese
no.fmuser.org ->Norwegian
fa.fmuser.org ->Persian
pl.fmuser.org ->Polish
pt.fmuser.org ->Portuguese
ro.fmuser.org ->Romanian
ru.fmuser.org ->Russian
sr.fmuser.org ->Serbian
sk.fmuser.org ->Slovak
sl.fmuser.org ->Slovenian
es.fmuser.org ->Spanish
sw.fmuser.org ->Swahili
sv.fmuser.org ->Swedish
th.fmuser.org ->Thai
tr.fmuser.org ->Turkish
uk.fmuser.org ->Ukrainian
ur.fmuser.org ->Urdu
vi.fmuser.org ->Vietnamese
cy.fmuser.org ->Welsh
yi.fmuser.org ->Yiddish
FMUSER Wirless Transmit Video And Audio More Easier !
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