High End Pre Group Design Invitation

[hau]

hi all

here is the schematic of the analog section with the pga2310's.
this is not final yet it still need some improvements .

 

[hau]

usb dac

hi

here is the pcb layout of the usb dac that rehan post yesterday.

 

[digi01]

there are another consideration is DS1802.the chip is a dual audio taper-potentiometer having logarithmic resistive haracteristics over the device range.

ds1802 datasheet

 

[rehanabid]

DS180X

Dallas Semi's pots 1802, 1666 are good choice and i have a few designs and layouts, but objective here is to build a modular pre around PGA231x.

 

[rehanabid]

Ok guys:
if any one is really interested in this project then i should keep posting the PCB layouts else i should continue the project privately with ferds and digi.

 

[earsandeyes]

please continue

Please continue.
At the moment I cannot contribute. When I see something that I can be of help I will.

Regards,

E&E

 

[carlosfm]

Changed flag, removed the pic...
Mmmm...

 

[rehanabid]

moving to vancouver tonight, as i ve dual nationality
I would be needing some help with the designs of digital section and some blocks of the program.

 

[Gcollier]

moving to vancouver tonight, as i ve dual nationality
I would be needing some help with the designs of digital section and some blocks of the program.

I've been looking at a design like this myself for some time...in fact I have all the parts necessary. One suggestion would be to toss the buttons for the interface and go with something like this:

http://www.qprox.com/products/qwheel_qt510.php

Should interface easily with the PIC, you could write some nice LCD routines for displaying the information.

It's actually uncanny just how close your plans for this project are to what I had planned myself.

G.

 

[rehanabid]

Karachi airport is a nice place, it has nice internet kiosk, however will look at ur feedback when i reach vancouver.
heres what they say:
"For placing any orders directly with Quantum, Minimum Order Quantities (MOQs) must be met"
which in this case is 2600
though a very good product, if only they could sell to individuals.
here is smoething of interest:
http://www.austriamicrosystems.com/03products/20_rotary_encoders.htm

 

[blu_line]

abidr,

I would be needing some help with the designs of digital section and some blocks of the program.

What do you need ?

grtz

Simon

 

[Gcollier]

Karachi airport is a nice place, it has nice internet kiosk, however will look at ur feedback when i reach vancouver.
heres what they say:
"For placing any orders directly with Quantum, Minimum Order Quantities (MOQs) must be met"
which in this case is 2600
though a very good product, if only they could sell to individuals.
here is smoething of interest:
http://www.austriamicrosystems.com/03products/20_rotary_encoders.htm

Digikey sells this chip in single quantities for around $7 Canadian. 😀

I am going to pick one up with my next order.

 

[rehanabid]

blu_line:
I need help in designing the digital section so that it could accomodat 5 keys (menu, menu+, menu-, up, down) , roatry encoder, 3 PINs(clock, data, latch for Qsurround5.1) and LCD with PIC 16F877A.



I love vancouver, my laptop, linux distro, its RAS, and my shell account.

 

[tobias_svensk]

This is a very interesting project I must say.

You wrote that it gonna use a 2x16 LCD, is it hard to modifiy the code later on so that a 2x20 or 4x20 LCD could be used?

And would'nt it be cool with a temp. & voltage sensor that could be displayed on the LCD! 🙂 I think AD has some easy ones.

Regards

 

[blu_line]

abidr,

drop me a mail at :

stdf23173 at yahoo dot co dot uk

with more specific detail

grtz

Simon

 

[rehanabid]

Simon Email(blu_line) has been dropped.

tobias_svensk:
changing the code in assembly is definitely a very difficult job as it will take many laborious hours to do it, however, due to courtesy of two good friends now i use PICBasicPro for making the program and its verrrrrrrrrrrrrrrry easy to change the code and reprogram the chip.
For temperature and voltage sensor i m afraid there wont be many pins left at the PIC mcu one all things are put in for the temp sensor, however, drop me an email at rehanabid@yahoo.com, with specific details and i ll look into it what could b done. But honestly i dont feel the need for temp sensor for a pre, power amp yes may be a different case...

 

[tobias_svensk]

hello abidr!

yeah you right, it's totaly unnecessary, it was just me that thought it could be cool to have more to show on the display 🙂

I won't be bugging you more with this little things 😉

But I will for sure follow this thread.

Cheers

 

[rehanabid]

Tobias
I am extremely sorry, if i posted anything that dsiappointed u or discouraged u, however, my only point was that once all things will be put with the PIC not many pins will be left for temp sensor.
You suggestion are valid and welcome.

 

[Gcollier]

Tobias
I am extremely sorry, if i posted anything that dsiappointed u or discouraged u, however, my only point was that once all things will be put with the PIC not many pins will be left for temp sensor.
You suggestion are valid and welcome.

How are you intending to handle the source switching in this pre design...forgive me if it was mentioned earlier.

G.

 

[tobias_svensk]

Tobias
I am extremely sorry, if i posted anything that dsiappointed u or discouraged u,

No no 🙂 No offence taken. It's just me thinking out loud.

Keep it up abidr, as this is Really gonna be a killer!

😀