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DIY TDA1541A PCB "D3"
DIY TDA1541A PCB "D3"
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Old 18th July 2019, 05:32 AM   #141
Myint67 is offline Myint67  Singapore
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Hi can I use Ian fifo pi ? How to wire with I2s ?
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Old 18th July 2019, 08:11 PM   #142
Ben Mah is offline Ben Mah  Canada
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Join Date: May 2012
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Connect the I2S out from the Fifopi to the I2S in on the Distinction board. To select I2S on the Distinction board, put a blob of solder on 'J1' on the back of the board.
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Old 22nd July 2019, 09:00 AM   #143
sthcoaster is offline sthcoaster  United Kingdom
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Join Date: Mar 2016
Location: Vientiane, Lao PDR
DIY TDA1541A PCB "D3"
Boards received this morning, Thanks Ryan
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Old 22nd July 2019, 09:57 AM   #144
ryanj is offline ryanj  Australia
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DIY TDA1541A PCB "D3"
Quote:
Originally Posted by sthcoaster View Post
Boards received this morning, Thanks Ryan
That was quick!
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Old 23rd July 2019, 09:10 AM   #145
sthcoaster is offline sthcoaster  United Kingdom
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DIY TDA1541A PCB "D3"
Quote:
Originally Posted by tomtest View Post
But my findings in the LtSpice simulation and the new circuit picture from Ryan shows 2x34V are correct. (Ryan please correct me if I am writing something stupid )
Ryan, as you know I've tried unsuccessfully to make this circuit work using 24v transformer. Now that I am looking for 34v transformer with CT as per your diagram I cannot find any suitable transformer (ie. 68v series 34v parallel or 34v-0-34v) the only one I can find on usual suppliers is a non-stocked item about US$200 and rated at 1700VA. I will be very interested to learn about the transformer you have been using.

I think for many us trying to do this project the PSU aspect is proving tricky.

Thanks.
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Old 23rd July 2019, 09:52 AM   #146
tomtest is offline tomtest  Germany
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DIY TDA1541A PCB "D3"
Quote:
Originally Posted by sthcoaster View Post
Ryan, as you know I've tried unsuccessfully to make this circuit work using 24v transformer. Now that I am looking for 34v transformer with CT as per your diagram I cannot find any suitable transformer (ie. 68v series 34v parallel or 34v-0-34v) the only one I can find on usual suppliers is a non-stocked item about US$200 and rated at 1700VA. I will be very interested to learn about the transformer you have been using.

I think for many us trying to do this project the PSU aspect is proving tricky.

Thanks.
Hi Clayton,

Here you can find such transformers :

TTSA0030 - Transformer AUDIO TSA30VA - voltage to 50V - Shop Toroidy.pl

As example 30VA but you can get a lot of others, and then you can choose 2x34V. They will cost around 24,-€ without shipping.
I have ordered one too but it has not arrived until now.
If I have gotten it and build the circuit i will inform you about my findings.

In the meantime I tried out to power up the D2 with two UltraBIBs from Salas with a transformer 2x15V connected to one + and one - PCB with connection between both 0 on the output and using only the + and - output (each adjusted to 13 between +/- to 0, so you get 26V between + and -).
A third UltraBIB is used for the 8V.

It works without any problems, but the simulations of Ryan circuit shows a clean output so I am curious how it will influence the sound.
As told I will keep you informed.

Hope that helps a little bit.

André
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Old 23rd July 2019, 10:54 AM   #147
ryanj is offline ryanj  Australia
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DIY TDA1541A PCB "D3"
Quote:
Originally Posted by sthcoaster View Post
Ryan, as you know I've tried unsuccessfully to make this circuit work using 24v transformer. Now that I am looking for 34v transformer with CT as per your diagram I cannot find any suitable transformer (ie. 68v series 34v parallel or 34v-0-34v) the only one I can find on usual suppliers is a non-stocked item about US$200 and rated at 1700VA. I will be very interested to learn about the transformer you have been using.

I think for many us trying to do this project the PSU aspect is proving tricky.

Thanks.
Hi Clayton,

The transformer im using is a "F-212Z" from Triad. It is a 24-0-24 24VA.

In the schematics I posted the model says 34V as a peak voltage not the RMS.

What exactly was the issue when you tried building this circuit previously?
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Old 23rd July 2019, 12:27 PM   #148
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 ryanj View Post
Hi Clayton,

The transformer im using is a "F-212Z" from Triad. It is a 24-0-24 24VA.

In the schematics I posted the model says 34V as a peak voltage not the RMS.

What exactly was the issue when you tried building this circuit previously?
I couldn’t get the voltage low enough when testing my with load resistor. From memory I could only get it down to 29v.
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Old 23rd July 2019, 12:31 PM   #149
sthcoaster is offline sthcoaster  United Kingdom
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Join Date: Mar 2016
Location: Vientiane, Lao PDR
DIY TDA1541A PCB "D3"
Thanks Andre. I had forgotten about Toroidy. Have bought from them before.

I see Ryan’s reply that he is using 24-0-24

I need to play around with my setup again and check the Darlingtons are still ok
I have been using 0-24v with full rectifier. Will try other things.

Quote:
Originally Posted by tomtest View Post
Hi Clayton,

Here you can find such transformers :

TTSA0030 - Transformer AUDIO TSA30VA - voltage to 50V - Shop Toroidy.pl

As example 30VA but you can get a lot of others, and then you can choose 2x34V. They will cost around 24,-€ without shipping.
I have ordered one too but it has not arrived until now.
If I have gotten it and build the circuit i will inform you about my findings.

In the meantime I tried out to power up the D2 with two UltraBIBs from Salas with a transformer 2x15V connected to one + and one - PCB with connection between both 0 on the output and using only the + and - output (each adjusted to 13 between +/- to 0, so you get 26V between + and -).
A third UltraBIB is used for the 8V.

It works without any problems, but the simulations of Ryan circuit shows a clean output so I am curious how it will influence the sound.
As told I will keep you informed.

Hope that helps a little bit.

André
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Old 23rd July 2019, 11:01 PM   #150
ryanj is offline ryanj  Australia
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Join Date: Jul 2010
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DIY TDA1541A PCB "D3"
Quote:
Originally Posted by sthcoaster View Post
Thanks Andre. I had forgotten about Toroidy. Have bought from them before.

I see Ryan’s reply that he is using 24-0-24

I need to play around with my setup again and check the Darlingtons are still ok
I have been using 0-24v with full rectifier. Will try other things.
Clayton,

Try using just 2 diodes in your rectifier instead of 4.
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