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Old 18th July 2005, 08:08 AM   #1
digi01 is offline digi01  China
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Default Q-amp

hello everyone,I have got some samples of Qsound from a friend.the chip is QS7785.I want to make a 5ch multi amp for my AV.I wonder if anyone have test it and get a good result?


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ohh,finally I have come back from decorating.Now I have free time for mine hobby cheers!

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Old 18th July 2005, 08:17 AM   #2
digi01 is offline digi01  China
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here is a connections of QS7785.I print screen from 7785's datasheet.
if it is in parallel interface,the mcu is unwanted.very simple.I want to do a p2p building.
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File Type: gif q-amp.gif (26.0 KB, 1176 views)
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Old 20th July 2005, 01:32 PM   #3
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Talking QSOUND MICROCHIPS

hi: qsound chips r not very known chips, however, if their data sheet is looked into it will b seen that Qsound chips are the cheapest alternatives DIY way to multichannel sound without expensive DOLBY LICENSING process or the use of tons of operational amplifiers and delay assemblies.
Imagine 5 channel out from a stereo source or 5.1 channel out from a stereo source. I will b interested in going ahead with this project.
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Old 22nd July 2005, 01:16 AM   #4
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Hi Digi01

Looks like a good project for any one and quiet simple aswell.
On the picture that u have posted i can not see where u get a center input from . Because there is only a rigth & left input ?

Or u going to join the L & R input together with some resistors and what ohm`s or kohm`s ? or u going to use for the center input .

Oh yes where can i get some samples from if not can u sell me 2 of then . That`s if u got some spare i can pay by paypal .

This chip would be good for Quadraphonic sound to it would be nice to hear those Quad Lp`s again .
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Old 24th July 2005, 06:03 AM   #5
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Default Qsound Chips

Qsound chips can deliver a 5 speaker out from a mono or stereo sound source there r two of them one is 7785 from a mono or stereo sound source it can deliver 5 speaker out 2 front, two rear and one center and this chips could be used independent of a MCU.
Other one is called QS5.1 this microchip could deliver a true 5.1 out from a mono/stereo source but a mcu is must to drive this microchip.
As for samples they r very difficult to get however may b i ll b able to arrange a few.
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Old 24th July 2005, 12:50 PM   #6
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Hi abidr

What is the size of the chip ? from this page http://www.metatech.com.hk/datasheet...f/qs7785r1.pdf is it a total 9mm across the chip or am i wrong .

If i`am wrong and the chip is much bigger what size is it ?
if could get hold of some samples of this chip it would great

many thanks scooby300
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Old 24th July 2005, 01:20 PM   #7
jarhu is offline jarhu  Finland
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Where you can get these beauties from, in EU?
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Old 25th July 2005, 02:33 AM   #8
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Scooby and jarhu:
Hi : if u want to get them urself u have to fing their distributors i mean of qsound. these chips r very small 9mm probably, I ve got 4 of them with me so meaning i dont need more than two, i could trade 1 with both of u.
QS7785 is a mono/stereo input to 5 channel out 2 front, 2 rear and 1 center and can be made without a MCU, however theres a better one called QS5.1, as the name suggests from a mono/stereo input source it produces 5.1 out 2 front, 2 rear, 1 center and 1 sub, but in this case a MCU is a must/
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Old 25th July 2005, 02:46 AM   #9
digi01 is offline digi01  China
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to scooby300,
Yes,It is a nice chip.another idea is to make a SUB card insert the pci socket of your PC,teamwork work with main sound card.then you can get a simple 3D sound system.

the difficult issue is the chip very small with 48 legs
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Old 25th July 2005, 11:00 AM   #10
hau is offline hau  Philippines
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hi adibr

i hope you can trade one to me. im very interested with the chip.

Best regards
hau
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