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GB for R-2R Volume Controller with 4 inputs

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#361
Yes and Yes , both should do the job .
Best regards.

Morde said:
Hi there! I managed to order one piece of the bare pcb sets. Unfortunately I was too slow to get the programmed microcontroller version. 😡 Now I need to learn how to use a heat gun and solder paste...

Would this be the right kind of device for flashing the Atmega?
Usbtiny Usbtinyisp AVR ISP Programmer USB for Arduino Bootloader Uno R3 TE514 | eBay

And for a display I'm considering to purchase this, which I believe should be compatible?
REC001602AYPP5N00001 RAYSTAR OPTRONICS - Display: OLED | TME - Electronic components
Click to expand...
 
#362
Plan said:
Is it possible to split the output in 2 if i want to hook up another amp? I´ll guess i have to consider the resistance or something?
Click to expand...

Yes, you can. Maya is a constant output impedance volume-controller where maximum input impedance is given by load, in this case your amplifiers parallel equivalent resistance.
For example: If your amplifiers have 100Kohm input impedance and you mount two of them in parallel, than you have an equivalent maximum 50Kohm input impedance which is reflected at MAYA input as well.

Brgds,
Tibi
 
#363
tvicol said:
Yes, you can. Maya is a constant output impedance volume-controller where maximum input impedance is given by load, in this case your amplifiers parallel equivalent resistance.
For example: If your amplifiers have 100Kohm input impedance and you mount two of them in parallel, than you have an equivalent maximum 50Kohm input impedance which is reflected at MAYA input as well.

Brgds,
Tibi
Click to expand...

Ok, i´m not having the Maya model though but i´ll guess it´s almost the same? I have the model from your GB before Maya. How low input amp resistance is ok to try? Or everything above 10.5k should work?
 
#372
#375
Hi ristar,
please test this version attached here : "atm16_r2r_v7_5_SE" and feedback about this.
It is intended for old r2r version without all transistors on pcb.
Best regards.
P.S. : That 4.3 version from our site is for old r2r with ALL transistors on pcb.
....sorry for this.
ristar said:
Hi Tibi,

The new file does not even power up the board. back to 4.1 now. The earlier 4.3 flashes fine but changes in volume clicks directly to output like the other transistor version software. This latest one does not even power up.
Click to expand...
 

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#376
danzup said:
Hi ristar,
please test this version attached here : "atm16_r2r_v7_5_SE" and feedback about this.
It is intended for old r2r version without all transistors on pcb.
Best regards.
P.S. : That 4.3 version from our site is for old r2r with ALL transistors on pcb.
....sorry for this.
Click to expand...

Hi danzup,

Happy New Year! Unfortunately this does the same thing. if it offers any clues, the relays don't click when testing the communication with the controller with the avrdude -c usbtiny -p m16 command when the offending firmware is flashed.

Additionally, you just hear clicking through speakers with each volume increase. Back to 4.1 again.

To be clear, the version I have is the assembled boards from Tibi. The boards are white just like the ones in the guide. There was no option about choosing transistors installed... so this is a little inconvenient that firmware upgrades are difficult. Since 4.3 is the final version, I hope you can help with this.
 
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#377
Hi ristar,
I have tested 4.3 and this version on a old r2r without transistors board and all firmware are working without issue . Can you post here a picture of pcb with lcd front and back ?
I think there is something else here ...
I have attached the version 4.3 without transistor here.
Best regards.
ristar said:
Hi danzup,

Happy New Year! Unfortunately this does the same thing. if it offers any clues, the relays don't click when testing the communication with the controller with the avrdude -c usbtiny -p m16 command when the offending firmware is flashed.

Additionally, you just hear clicking through speakers with each volume increase. Back to 4.1 again.

To be clear, the version I have is the assembled boards from Tibi. The boards are white just like the ones in the guide.
Click to expand...
 

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#378
danzup said:
Hi ristar,
I have tested 4.3 and this version on a old r2r without transistors board and all firmware are working without issue . Can you post here a picture of pcb with lcd front and back ?
I think there is something else here ...
I have attached the version 4.3 without transistor here.
Best regards.
Click to expand...

this version is 34k vs 36k from the one tibi posted earlier. the clicks only start from -32 and up... I didn't test all the way because I still like my unifield3 😉
 

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