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GB for R2R audio volume / input selection pcb

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#61
bbp said:
Hi Tvicol, I recommentd 8bits or more relays uses in the volume control, for the reason that 6bits is really not enough for a suitable attenuation.
You can get 48dB attenuation with 8bits relays
also, 36dB only in 6bits
regards
Lu
Click to expand...
It is not really r2r , we call it so because the schematics is identically , but the values of resistors are like this :
-1dB -2dB -4dB -8dB -16dB -32dB
6 bit = total attenuation -63dB

Now do you understand ?
 
#63
Schematic attached.

Regards,
Tibi
 

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  • Schematic_VC_R2R&shunt.jpg
    Schematic_VC_R2R&shunt.jpg
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#69
Luke said:
hmmm too late, been thinking about one of these. Do you plan to do another run?
Click to expand...


As soon we´ll finish to deliver all boards for this GB, will think to run another one, maybe with boards fully mounted and tested. A finished product.
Time to deliver will be a little longer, but the wait will worth as we´ll choose high quality components like vishay melf resistors, genuine Rubycon ZL/ZA caps and Takamisawa relays.
Anyhow you will still have the option to buy only the board with atmel programmed.

Regards,
Tibi
 
#70
tvicol said:
As soon we´ll finish to deliver all boards for this GB, will think to run another one, maybe with boards fully mounted and tested. A finished product.
Time to deliver will be a little longer, but the wait will worth as we´ll choose high quality components like vishay melf resistors, genuine Rubycon ZL/ZA caps and Takamisawa relays.
Anyhow you will still have the option to buy only the board with atmel programmed.

Regards,
Tibi
Click to expand...

nice.
 
#74
#75
hi tvicol,

i have bought the boards from you but they all program for LCD, now one friend
wants to use the LED configuration. I received also the schematic with the 6 pin
but i need to know what to do exactly to pre program the chip. I have the follow;

GTP-Plus programmer for USB.gtp_usb.jpg
must i connect the programmer to the board, and must i also connect the powersupply
of the board. or not

please tell me what to do?
 
Last edited:
#76
TBKK said:
hi tvicol,

i have bought the boards from you but they all program for LCD, now one friend
wants to use the LED configuration. I received also the schematic with the 6 pin
but i need to know what to do exactly to pre program the chip. I have the follow;

GTP-Plus programmer for USB.View attachment 177257
must i connect the programmer to the board, and must i also connect the powersupply
of the board. or not

please tell me what to do?
Click to expand...

That programmer is only for PIC and NOT for Atmel AVR !!! It will not work !
Programming with a compatible ISP for AVR is simple : with the target power on you connect the 6 signals to programmer and write the firmware .
A little google will show you a lot of compatible programmer interfaces and how to do this .
 
#77
hi danzup,

I have program Atmel with this programmer combine with WINPIC800
they even have the Atmel 8515 to select. I found this schematic
this will work so the board must be connect to power.

Regards,
TBKK
 

Attachments

  • STK200_isp_sch.gif
    STK200_isp_sch.gif
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#78
Tvicol,

Help
am assembly the board, order everything by TME very good and quick delivery
i have BCX56-16 according to the BOM list but the housing is to small look at the
picture, any suggestion for this problem.

TBKK
 

Attachments

  • CIMG1509.JPG
    CIMG1509.JPG
    233.5 KB · Views: 381
#79
TBKK said:
hi danzup,
I found this schematic
this will work so the board must be connect to power.

Regards,
TBKK
Click to expand...
If that interface can program Atmel AVR then it is ok !
You must connect following pins for atmel : MISO ,MOSI , CLK, RESET , +5V , GND from the programmer to corresponded Atmel pins


Yes ! This is the good interface . The board must have power as the programmer is powered from board . Use Bascom AVR to programm .
download for free from here : Downloads - MCS Electronics
 
#80
TBKK said:
Tvicol,

Help
am assembly the board, order everything by TME very good and quick delivery
i have BCX56-16 according to the BOM list but the housing is to small look at the
picture, any suggestion for this problem.

TBKK
Click to expand...
Sorry !!!
BOM list wrong ! I have forgot to update BOM list !
I will be back with the correct code for transistor .
Sorry again.
 
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