• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

DIY TDA1541A PCB "D3"

Would you like a through hole version of the D3?

  • Yes

    Votes: 12 52.2%

  • Maybe, depends on the performance

    Votes: 11 47.8%
  • Total voters
    23
  • Poll closed .
Jump to Latest
M

markos4553

Member
Joined 2010
Hi Greg,


To clarify I am working under magnification and I am not preheating my boards, but I do use a fair amount of no clean flux a Hakko 888 iron with a .8mm tip at 650F and .015in diameter 63/37 Kester. I first put down some flux then add some solder to the first pad on the board of the item I am intending to solder. I then solder the item down to that first fluxed/soldered pad. Then finish the rest on the item, working fast so as not heat anything up too much. Having the really small solder wire helped me tremendously.



This method has worked for 2 simultaneous boards and 2 D3 boards and I have never done SMD soldering before this project.



Good luck,


Mark K.
 
R

ryanj

Member
Joined 2010
horika said:
Hi, if i use two d3 panels in simultaneous mode driven by ryan logic converter what is the correct aor connection? would someone put a block sketch here?
I use an I / V resistor. a transformer test is also planned.
Click to expand...

Hi horika,

If running in parallel with 2 boards it would be best to use one 1541 chip per channel, and use just the one IV resistor per channel.
 
H

horika

Member
Joined 2010
then 25 in and 6 pin connect and common point and body between I / V resistance? or an I / V resistor between 25 pins and gtest and a resistor between 6 pins and gtest. output 25 pins and 6 pins? sorry to ask but so i have not used tda chips in this mode
 
Last edited:
R

ryanj

Member
Joined 2010
horika said:
then 25 in and 6 pin connect and common point and body between I / V resistance? or an I / V resistor between 25 pins and gtest and a resistor between 6 pins and gtest. output 25 pins and 6 pins? sorry to ask but so i have not used tda chips in this mode
Click to expand...

Populate R36 and R35 with your IV resistor, then AOL1 and AOR1 are your outputs, adjust TR1 and TR2 until you get 0V on AOL1 and AOR1, if running in parallel then you connect AOL1 and AOR1 together.
 
R

ryanj

Member
Joined 2010
horika said:
Hi, if i use two d3 panels in simultaneous mode driven by ryan logic converter what is the correct aor connection? would someone put a block sketch here?
I use an I / V resistor. a transformer test is also planned.
Click to expand...

I just saw you PM to me - Are you planning on operating in parallel or differential? If running in differential mode you will need to invert the data lines, have you done this?

1st D3 needs:
LE, BCK, RIGHT DATA, INVERTED RIGHT DATA

2nd D3 needs:
LE, BCK, LEFT DATA, INVERTED LEFT DATA
 
Last edited:
R

ryanj

Member
Joined 2010
Differential example

Horika,

Attached is an example of how to configure your DAC if you are using a transformer with a differential output. It seems to work very well in my setup.

The inverted and non-inverted in the example should be swapped around.
 

Attachments

  • differential example.jpg
    differential example.jpg
    53.9 KB · Views: 306
Last edited:
Mayday

Mayday

Member
Joined 2004
A thought hit me, yes it did hurt....
Has anyone tried using Muse BP across the 22uF acrylic capacitors?
Same value, higher value doesn't matter I'm wondering if anyone has tried it and the results of that test.

How critical is the tolerance of the 10R 2W resistor.
I seem to have misplaced mine. Closest I got with two THT 1W resistors was 10.8R. So I left that spot unpopulated for now.

I made a layout for the BF862 I/V floating around the web. It works in simulation at least.

Then there's the DDNF I built with boutique parts.
I've considered doing a layout of that circuit using SMD's, only for my own personal use as I have not asked the designer for permission to share nor do I want the hassle of sending out boards.
 
H

horika

Member
Joined 2010
ryanj said:
Horika,

Attached is an example of how to configure your DAC if you are using a transformer with a differential output. It seems to work very well in my setup.

The inverted and non-inverted in the example should be swapped around.
Click to expand...

Thanks. I ended up. It works. I use it in differential mode. 100% made with recommended parts. Unfortunately, the jack voltage (50Hz) sits on the hand. I'm looking for the bug but can't find it. idea?
 
Mayday

Mayday

Member
Joined 2004
ryanj said:
Hi Mayday,

10.8R should be ok, you will get a lower current resulting in higher z-out at the supply voltages but it may not be noticeable.
Click to expand...

So, a slightly lower value, if I can find among my 1W THT resistors (used in parallel) would be preferable?
Say with the same error margin, that would make it 9.2R.
Would that set the current too high?
I'll try my best to either locate the missing 10R or find something a lot closer to 10R.
 
You must log in or register to reply here.
Top Bottom