Hi,
Thel from Germany has nice 6x20k log for 40 euros:
http://www.thel-audioworld.de/bauteile/regler/regler.htm
Thel from Germany has nice 6x20k log for 40 euros:
http://www.thel-audioworld.de/bauteile/regler/regler.htm
The R-2R ladder is a possibility, but I used constant impedance attenuators for my preamp. These are L-type ones, with relay switching. No uP, but an optical encoder (you can get the components for this out of a defunct pc mouse and mount them on a pot with a bit of imagination) feeding an 8-bit up-down counter (6 bits used). Using the preset input of the counter to get a certain volume at power-up.
If you make 6 of them an connect the relay input together it works fine.
Don't know why you make a fuss about the phase at 20kHz with a 200kHz filter when going suround. The phase problems associated with suround are orders of magnitude worse than that.
If you make 6 of them an connect the relay input together it works fine.
Don't know why you make a fuss about the phase at 20kHz with a 200kHz filter when going suround. The phase problems associated with suround are orders of magnitude worse than that.
The easiest to made this preamp is to use 3 CS3310 (BB-PGA2310 ), and more if you drive it by a µC you can drive a LCD screen or DELs and decode IR informations. The problem is the CS3310 need +-15V power supply and +5V, for digital, so it needs a complicate PCB.
I know in France, the price of the cs3310 is near 20€.
Bye..
I know in France, the price of the cs3310 is near 20€.
Bye..
Hello,
Sorry for my bad explication, my passive preamp is controled by the µC, the potentiometre used is an ALPS with motor, the source selector is made with 3 relays and the µC decode IR information and command the volume and selection.
Soon I'm going to try to work on a 6 ways preamp based on Burr-Brown PGA 2310.
If you want precise informations about my two ways pre, don't hesitate.
Bye.
Sorry for my bad explication, my passive preamp is controled by the µC, the potentiometre used is an ALPS with motor, the source selector is made with 3 relays and the µC decode IR information and command the volume and selection.
Soon I'm going to try to work on a 6 ways preamp based on Burr-Brown PGA 2310.
If you want precise informations about my two ways pre, don't hesitate.
Bye.
Attachments
Another solution consists in building a 6 chan pot yourself.
This is what I did for my latest 6 chan preamp :
Final result :
A 2 chan and a 4 chan Vishay P11 pot :
The 2 chan is then glued to the bottom of the 4 :
More details here (in French
http://johnix.free.fr/cocorezo3.php
)
This is what I did for my latest 6 chan preamp :
Final result :
An externally hosted image should be here but it was not working when we last tested it.
A 2 chan and a 4 chan Vishay P11 pot :
An externally hosted image should be here but it was not working when we last tested it.
The 2 chan is then glued to the bottom of the 4 :
An externally hosted image should be here but it was not working when we last tested it.
More details here (in French
http://johnix.free.fr/cocorezo3.php
)Google is your friend ...
Google language translation
Very nice looking amp!
Where did you get the chassis/cabinet for this? It looks like Monacor, and from a quick look at Google it looks like they aren't in the US. Darn!
The volume control is a great idea, I'll have to get some of these Vishay P11's and mess around with that.
Google language translation
Very nice looking amp!
Where did you get the chassis/cabinet for this? It looks like Monacor, and from a quick look at Google it looks like they aren't in the US. Darn!
The volume control is a great idea, I'll have to get some of these Vishay P11's and mess around with that.
Hi there
I have been working on the same idea fo sometime now and my thread is located at : http://www.diyaudio.com/forums/showthread.php?s=&threadid=32427&highlight=
Its been a while I ve been working on the same, just final touches need to be given to layouts, and will accomodate 4 PGAs meaning an 8 channel sound, and PIC16F877 as uC, and output relays, once I am through slight prototyping will be done and then on to production house for making about 50 or so PCBs. if needed I could post the schematics.
I have been working on the same idea fo sometime now and my thread is located at : http://www.diyaudio.com/forums/showthread.php?s=&threadid=32427&highlight=
Its been a while I ve been working on the same, just final touches need to be given to layouts, and will accomodate 4 PGAs meaning an 8 channel sound, and PIC16F877 as uC, and output relays, once I am through slight prototyping will be done and then on to production house for making about 50 or so PCBs. if needed I could post the schematics.
There is one chip i'm testing now: SSM2160 - 6 ch. audio pot. More info:
ssm2160 info
Pga2310 is a very good audio volume control
look:
pga2310
ssm2160 info
Pga2310 is a very good audio volume control
look:pga2310
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