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Old 10th January 2012, 09:45 AM   #701
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Quote:
Originally Posted by didiet78 View Post
Danzup, in post Yet another Volume controlers and source selections can i just change PGA2310 with PGA2311 and change analog supply with +/-5V without change the HEX file?

Didiet
PGA2310 & PGA2311 use same software just the VOLT(+-12 & +-5) is diffrent
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Old 10th January 2012, 02:22 PM   #702
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Thanks Farmtech
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Old 11th January 2012, 12:55 PM   #703
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Default TDA7439 ATMEGA8

Hi
Finish the test program for TDA7439

Quote:
'ATMEGA8
'fusebit INT 8 Mhz
' LINK TO DATASHEET http://www.atmel.com/dyn/resources/p...ts/doc2486.pdf

' ENCODER/BUTON
' Portd.0 MENU Button
' portD.1 Encoder B
' portD.2 Encoder A
' GND Encoder C
' LINK to DATASHEET http://www.sparkfun.com/datasheets/C.../TW-700198.pdf

' TDA7439
' SDA Pin 1 To Portc.4
' SCL Pin 30 To Portc.5
' 2 * 4K7 RES to pullup SDA & SCL to +5V
' LINK TO DATASHEET http://www.datasheetcatalog.org/data...onics/4291.pdf

' LCD 16x2
' Rs = Portb.0
' E = Portb.1
' Db4 = Portb.2
' Db5 = Portb.3
' Db6 = Portb.4
' Db7 = Portb.5
' RW = GND
' Add a potmeter for contrast !!!

' FUNCTIONS
' INPUT 1 to 4
' VOLUME 0 to -56 db
' INPUT GAIN 0 to 15 db
' BASS -14 to +14 db
' MIDDLE -14 to +14 db
' TRIBLE -14 to +14 db

' MENU AUTO RESET TO MAIN menu (volume) after 3 sec
Video Here :
VIODE OF LCD MENU

Files Here :
HEX BIN for ATMEGA8 & schematic
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Old 12th January 2012, 05:30 AM   #704
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Exclamation TDA7439 ATMEGA8 Error fix

Small fix in code
INPUT GAIN 0 to 15 db was wrong
change to 0 to 30db

files are updated
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Old 12th January 2012, 02:51 PM   #705
aditya is offline aditya  India
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ok
one thng can we change input 1 ... to some thing like CD, FM , USB DAC, Phone , phone as in cell phone.. for usb dac i was thinking sinc there is a pin on PCM2704 which changes state when connected to pc. than we can use that pin to check for connection to pc so no need to touch the dial for changing channel if we connect to pc
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Old 12th January 2012, 08:21 PM   #706
Jempie is offline Jempie  Indonesia
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Quote:
Originally Posted by tvicol View Post
Jempie,

LM1117DT is a low drop regulator. Use a trafo with min 6V ac - max 9V ac.

Regards,
Tibi
Ok thanks
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Old 13th January 2012, 12:22 PM   #707
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Quote:
Originally Posted by aditya View Post
ok
one thng can we change input 1 ... to some thing like CD, FM , USB DAC, Phone , phone as in cell phone.. for usb dac i was thinking sinc there is a pin on PCM2704 which changes state when connected to pc. than we can use that pin to check for connection to pc so no need to touch the dial for changing channel if we connect to pc
Done CD, FM , USB DAC, Phone and center menu select on lcd

Added Portd.3 as SSPND
activ = low (auto select USB DAC)

! Note you cant change input while PORTD.3 IS LOW

files are updated
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Last edited by FarmTech; 13th January 2012 at 12:40 PM. Reason: more info
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Old 13th January 2012, 10:19 PM   #708
Jempie is offline Jempie  Indonesia
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farmtech,

why I hear hum when i disconnect any source, i don't think it's normal
if you compare it to another preamp you will hear nothing
se it seems that the input is open that is the sound i hear.
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Old 14th January 2012, 01:32 PM   #709
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Quote:
Originally Posted by Jempie View Post
farmtech,

why I hear hum when i disconnect any source, i don't think it's normal
if you compare it to another preamp you will hear nothing
se it seems that the input is open that is the sound i hear.
Hi,
I dont have this problem with my pcb setup
maybe you can show 1 picture of the insite of case
it can be lots of thinks gnd loops ect
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Old 14th January 2012, 01:39 PM   #710
Jempie is offline Jempie  Indonesia
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it's the same board as you can buy from tibi.
turn the volume up, and disconnoct the source you will hear hum
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