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DIY TDA1541A PCB "D3"
DIY TDA1541A PCB "D3"
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Old 14th October 2020, 10:12 AM   #781
advr is offline advr  Netherlands
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Quote:
Originally Posted by chromenuts View Post
Thanks...Iím not looking for a substitute to the D3. I just wanted to minimize risk of damage to my tda1541 while testing voltages on the board.


My intention was you place it the first time powering up and check if everything is working as it should be. Then you don't have to use the precious tda1541.DIY TDA1541A PCB "D3"

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Old 14th October 2020, 12:29 PM   #782
tubo is offline tubo  Philippines
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Hi guys,

I only get 25.2 vdc from my power supply but it seems to be working fine.. Is 25.2 vdc too low for the d3? What is the optimum range to power the d3?

Thanks
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Old 14th October 2020, 10:17 PM   #783
chromenuts is online now chromenuts  United States
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DIY TDA1541A PCB "D3"
Iím aiming for 26-27V as I believe Ryan said was acceptable.

Obviously the board power inlet is labeled 26V.

I wouldnít have had to change anything on the CMx if I had been able to stick with the 22V transformer I initially tested it with.

Unfortunately, it took up more space than I wanted so I ordered a Triad VPT48-520 which put out 27.5V after the CMx with a 200 Ohm load.

I felt that was too high and had to start playing with R4 and R5 to try and get it to an acceptable level.

After I tested my CMx board a second time with 22 Ohm paralleled with a 100 Ohm I actually got about 26.3V.

There is obviously fluctuations in my mains voltage causing it to swing. It appears to be centered on about 26V so I am leaving it for now.
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Old 17th October 2020, 05:29 PM   #784
analog_sa is online now analog_sa  Europe
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DIY TDA1541A PCB "D3"
A question about BOM.

What determined the choice of the KA caps? Were other caps auditioned in their place or was the slimness their main attraction? The reason i ask is i have no first hand experience with KA and the internet opinions about them are controversial at best.
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Old 17th October 2020, 10:47 PM   #785
ryanj is offline ryanj  Australia
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DIY TDA1541A PCB "D3"
Quote:
Originally Posted by analog_sa View Post
A question about BOM.

What determined the choice of the KA caps? Were other caps auditioned in their place or was the slimness their main attraction? The reason i ask is i have no first hand experience with KA and the internet opinions about them are controversial at best.
Try whatever caps takes your fancy.
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Old 17th October 2020, 11:06 PM   #786
analog_sa is online now analog_sa  Europe
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DIY TDA1541A PCB "D3"
So, no special considerations then. Thanks!
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Old 17th October 2020, 11:24 PM   #787
ryanj is offline ryanj  Australia
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DIY TDA1541A PCB "D3"
Default D3 input voltage

The voltage input limitations are set by the amount of heat dissipated by CC1 and V1 . I usually aim between 26V and 27V, but I have used up to 28V with no issues as long as the temp on CC1 and V1 are not too far above around 55 Celsius.

I would not recommend going lower than 26V - as this was the voltage that I used in the simulation to get good performance, anything lower than 25.5V may affect performance.
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Old 17th October 2020, 11:26 PM   #788
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by analog_sa View Post
So, no special considerations then. Thanks!
I liked the small form factor, I was severely limited by space with my design and I didn't want to do a full redesign.

Edit: They also performed just fine when tested with a recording at -60dB

Last edited by ryanj; 17th October 2020 at 11:44 PM.
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Old 17th October 2020, 11:34 PM   #789
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by aguaazul View Post
Ryan,

My package arrived today in SF Bay Area of California today!
Looking good. Thanks for all you do Ryan!

Aguaazul
You're welcome
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Old 18th October 2020, 12:55 AM   #790
Vunce is online now Vunce  United States
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DIY TDA1541A PCB "D3"
Quote:
Originally Posted by ryanj View Post
The voltage input limitations are set by the amount of heat dissipated by CC1 and V1 . I usually aim between 26V and 27V, but I have used up to 28V with no issues as long as the temp on CC1 and V1 are not too far above around 55 Celsius.

I would not recommend going lower than 26V - as this was the voltage that I used in the simulation to get good performance, anything lower than 25.5V may affect performance.

I was playing around with a variac and varying the input voltage to the Dac board. Absolutely correct about CC1, the temp gets to high quickly. Iíve gone as low as 24.5vdc, below 24.1v the three voltages start to go out of regulation. If the simulation was based on 26v, try to be within -0.5/+1.0 of 26v.
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