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Block diagrams of Quad (QS/SQ) systems with logic

national-kid

Junior Member
Joined
Mar 29, 2012
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Location
Tokyo
#43
Thank you gotten interested.
Number of parts is only 920 pieces. (number of dual op amp is only 62 pieces.)
Until then, made in the universal board.
But this time, compared with it, without wiring mistakes, production was very easy.
 

DuncanS

1K Club - QQ Shooting Star
Joined
Aug 30, 2012
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#45
Really nice unit, and very impressed that you've recreated the logic functions.
 

kap'n krunch

organ of Corti junkie
Joined
Nov 25, 2008
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Several miles from Red Rocks...
#46
I'll buy one from you...if the specs are right...has to have a freq response of up to 44K at least (+/- 3dB), and at least 30 dB channel separation...phono in is not needed(it would be another module, a preamp)
 

national-kid

Junior Member
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Mar 29, 2012
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#47
This all looks like Chinese to me, but ...it's very pretty...

So ...what are the output specs? (channel separation, freq response, etc.)?
Separation is not very good. However, there was no practical problem.
Direction discrimination and responsiveness is also very important.
 

Attachments

national-kid

Junior Member
Joined
Mar 29, 2012
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#48
Please disregard the above data.
Place the measurement data that has been modified in the following.

Frequecy Responce & Channel Separation

Page 1
Homebrew QS Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight
Homebrew SQ Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight

Page 2
Homebrew 3 Band SQ Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight
QSD-1 3 Band QS Vario Matrix decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight

Page 3
QSD-2 QS Vario Matrix decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight
QSD-1000 QS Vario Matrix decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight

Page 4
SQA-2030 SQ W/M Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight
SQD-2050 SQ F/B Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight
 

Attachments

Joined
Apr 7, 2008
Messages
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Location
Colchester UK
#50
That's actually quite good separation and clearly correct decoding (minimum 15db). I've looked at the schematics and cannot understand OD's comment, it all looks very good ))
 
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