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DIY TDA1541A PCB "D3"
DIY TDA1541A PCB "D3"
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Old Yesterday, 06:33 AM   #431
sthcoaster is offline sthcoaster  United Kingdom
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Join Date: Mar 2016
Location: Vientiane, Lao PDR
DIY TDA1541A PCB "D3"
Early stages
Wife has gone away for work therefore ... the dining table is mine for the whole week!! should be well towards being finished by then.

So far in donor Onkyo chassis (be long term home but maybe not forever as I have other ideas)

Sjostrom SSR03 At 30v to power B1 output
3 x 5v Reflecktor-D = 2 for Receiver, 1 for I2S to Simultaneous
1 x 8v for the D3 board

I plan to fit D3, I2S and receiver vertically on back panel
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Old Yesterday, 08:34 AM   #432
sthcoaster is offline sthcoaster  United Kingdom
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Join Date: Mar 2016
Location: Vientiane, Lao PDR
DIY TDA1541A PCB "D3"
Quote:
Originally Posted by sthcoaster View Post
1 x 8v for the D3 board
Ok just had another look because I have D2 and D3 and now remember that D3 needs 5v not the 8v from D2

And D3 board is bigger than D2 so it is not going to fit as planned - back to the drawing board
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Old Yesterday, 11:39 AM   #433
sthcoaster is offline sthcoaster  United Kingdom
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Join Date: Mar 2016
Location: Vientiane, Lao PDR
DIY TDA1541A PCB "D3"
Happy with my days work.

All the drilling etc complete.

I had some ridiculously oversize output caps on the D1 and so this was giving me grief trying to fit everything in - so I swapped them out for some smaller ones which gained me more real estate

Wire up my psu and regulators tomorrow. Iíve tested them all separately already so hopefully there will be no problems. Only the D1 is completely untested.
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Old Yesterday, 12:05 PM   #434
ggetzoff is offline ggetzoff  United States
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Join Date: Nov 2004
Location: Southwest
Quote:
Originally Posted by Ben Mah View Post
Hi Greg,

At WS1, with diode check (TDA installed), positive probe at TDA pin 1, negative probe at other end of diode D1, V=0.59V, R=1.62Mohm, reverse probes V=0. What do you measure with positive probe at chip end of D1?

I was not able to access the underside of my board to measure D3. With TDA installed, with negative probe at TDA pin 1 and positive probe at Gnd (D2, D4, D3 in series), 1.2kohm, 1.015V. With positive probe at pin 1 and negative probe at Gnd, 1.2kohm, 1.27V.

Ben
Ben,

This is very helpful. When I get home on Wednesday Iíll check again, but I think D1 might be reversed.

I did have WS1 shorted, fixed, but I really need to replace a couple of the U.FL.s

I will post detailed pics as well.

Thank you for all the help!

Ryan,

How is your D3 board stock at this time?

Cheers,

Greg
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Old Yesterday, 02:23 PM   #435
ggetzoff is offline ggetzoff  United States
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Location: Southwest
This obviously is not the pictures you need, but this is my build.....

IMG_20191117_105205.jpg

My phone inserts all of inverted...sorry. That's the the way I like to fly, though.

I will get the D3 working, I will not fail!!
__________________
Airline Pilot-If it's not Boeing I'm not going.
Aleph J, DCB1, VHEX + USSA-5, BA-3 Pre, DCG3, USSPA, Transcendent Sound Masterpiece

Last edited by ggetzoff; Yesterday at 02:26 PM.
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Old Yesterday, 02:47 PM   #436
wlowes is offline wlowes  Canada
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Location: Toronto
Sthcoaster... looks great!

Greg... looks like you are on the right path. Basically, if you have +5,-5.-15v at the 1541a, AND a proper digital signal, the 1541a will make music. (if it sounds bad then problem is with caps or DEM). So if you are missing music it is the signal that is the problem. Trace back to the source and you will succeed. Best luck.
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Old Yesterday, 03:31 PM   #437
ggetzoff is offline ggetzoff  United States
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Quote:
Originally Posted by wlowes View Post
Sthcoaster... looks great!

Greg... looks like you are on the right path. Basically, if you have +5,-5.-15v at the 1541a, AND a proper digital signal, the 1541a will make music. (if it sounds bad then problem is with caps or DEM). So if you are missing music it is the signal that is the problem. Trace back to the source and you will succeed. Best luck.
Thanks for the encouragement. Iíve pretty much made all the mistakes So, I will be putting a guide together to help prevent others from making all my mistakes!

Yes, I will get there. I just ordered fresh PCB, I may start over. I think Iíve got a reversed diode on WS1.

Cheers,

Greg
__________________
Airline Pilot-If it's not Boeing I'm not going.
Aleph J, DCB1, VHEX + USSA-5, BA-3 Pre, DCG3, USSPA, Transcendent Sound Masterpiece
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Old Yesterday, 10:30 PM   #438
markos4553 is offline markos4553  United States
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Join Date: Mar 2010
Location: Central, MN
Hi everyone,


Thank you for all the help! I got home today and my cheap Digital Coax to I2S converter came. So I hooked it up and checked all supply voltages which have always been spot on and everything looked good.



I had no connections for signal input or output. This was the key for me! Everything connected and it works perfectly!!!!!!


AOL & AOR are zeroed with equal positive and minus variation across the 0V point.


Sound is very nice!


Thank you again,


Mark K.
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Old Today, 12:12 AM   #439
ggetzoff is offline ggetzoff  United States
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Join Date: Nov 2004
Location: Southwest
Quote:
Originally Posted by markos4553 View Post
Hi everyone,


Thank you for all the help! I got home today and my cheap Digital Coax to I2S converter came. So I hooked it up and checked all supply voltages which have always been spot on and everything looked good.



I had no connections for signal input or output. This was the key for me! Everything connected and it works perfectly!!!!!!


AOL & AOR are zeroed with equal positive and minus variation across the 0V point.


Sound is very nice!


Thank you again,


Mark K.
Good job!
__________________
Airline Pilot-If it's not Boeing I'm not going.
Aleph J, DCB1, VHEX + USSA-5, BA-3 Pre, DCG3, USSPA, Transcendent Sound Masterpiece
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Old Today, 01:20 AM   #440
markos4553 is offline markos4553  United States
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Join Date: Mar 2010
Location: Central, MN
Thanks Greg. I'm eagerly waiting for your posting the same conclusion, it does sound very nice and well worth it.



The Simultaneous board is also now in place and works very well too!


Mark K.
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