Hello,
I have some TDA1541A chips and this parts Nakamichi CDC4A with the S1 removed and a dead laser. As far as I know the rest of the player works.
I was wondering if this could be turned into a stand alone DAC unit somehow? It seems like good a way to reuse some of these parts rather than just sitting or recycling them.
Can the Analog Process PCB be fed power and a signal of some kind and output music or is the signal required something odd? I honestly don't know and am hoping someone does and could tell me if it's a waste of time or not.
Thanks,
Mark K.
I have some TDA1541A chips and this parts Nakamichi CDC4A with the S1 removed and a dead laser. As far as I know the rest of the player works.
I was wondering if this could be turned into a stand alone DAC unit somehow? It seems like good a way to reuse some of these parts rather than just sitting or recycling them.
Can the Analog Process PCB be fed power and a signal of some kind and output music or is the signal required something odd? I honestly don't know and am hoping someone does and could tell me if it's a waste of time or not.
Thanks,
Mark K.
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The Analog Process PCB can indeed be fed with a 3-wire I2S-like signal - this goes into the YM3414 digital filter chip. The challenge to overcome is this digital filter chip needs its input signals to be synchronous with its own 16.9MHz XTAL oscillator. But when receiving S/PDIF the clock master is the digital transport hence you'll need to address this apparent incompatibility.
Two possibilities I can think of - 1) install an ASRC to allow the data to be resampled to the YM3414 clock domain or 2) substitute a pin compatible digital filter chip in place of the YM3414. Looks like YM3434 fits the bill - it doesn't require the incoming digital audio stream to be in sync with its local oscillator.
Two possibilities I can think of - 1) install an ASRC to allow the data to be resampled to the YM3414 clock domain or 2) substitute a pin compatible digital filter chip in place of the YM3414. Looks like YM3434 fits the bill - it doesn't require the incoming digital audio stream to be in sync with its local oscillator.
Another possibility is to feed i2s directly to tda1541a chip. The i2s feed can be from an USB to i2s board or directly from a single board computer such as an Odroid C2 or a Pi. This is assuming that you intend to use a computer to play music.
For the TDA chip to accept i2s, pin 27 needs to be connected to pin 28 instead of to pin 26. Also pin 2 needs to be connected to pin 4. Pins 1,2, and 3 and ground are then the inputs for the i2s feed.
For the TDA chip to accept i2s, pin 27 needs to be connected to pin 28 instead of to pin 26. Also pin 2 needs to be connected to pin 4. Pins 1,2, and 3 and ground are then the inputs for the i2s feed.
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Thank you Ben Mah for the suggestion! I was hoping to do the least amount of manipulation to the board itself. Not to say I’m not above this in the future.
If I am reading this correctly the Nakamichi is running the TDA1541A in Simultaneous mode with pin 27(OB/TWC) and pin 26(Vdd1, -5V) tied together, and then by having separate DataR and DataL inputs on pins 3,4 with LE on pin 1 and BCK on pin 2. I’ve read this isn’t all that common and may be superior sound wise.
The Analog process board is also seemingly a separate entity from the rest of the machine, which I thought may make it easier to send the appropriate signals and use as is. I don’t mind switching out the YM3414 for the YM3434 and have the tools to do so as long as I can keep the simultaneous mode. If not it really may be better to go a different route with these TDA1541’s and I don’t really mind that either, again this unit is parts and taking space so no big deal either way.
This stuff is new to me and I’m learning, albeit seemingly slowly in my old age. I have a very large library of music in mp3 and in the last few years I’ve been ripping WAV only. I have used this music for IPOD only as I have always listened to great music from CD players in a home system. I currently have several working TDA1541 players including a working CDC4A wS1, but I see the writing on the wall. I have acquired TDA1541/A’s and would like to use them since I like the sound. I don’t really have any hi res music files.
I don’t mind acquiring a device or devices to input the appropriate signals, I’m just not sure what I would need and don’t mind suggestions there either, in fact I would very much appreciate them. If this is too complicated right now or impossible due to incompatibility I can also accept that but I really do want to play with this stuff so I’ll probably keep on it anyway.
Thank you again sincerely,
Mark K.
If I am reading this correctly the Nakamichi is running the TDA1541A in Simultaneous mode with pin 27(OB/TWC) and pin 26(Vdd1, -5V) tied together, and then by having separate DataR and DataL inputs on pins 3,4 with LE on pin 1 and BCK on pin 2. I’ve read this isn’t all that common and may be superior sound wise.
The Analog process board is also seemingly a separate entity from the rest of the machine, which I thought may make it easier to send the appropriate signals and use as is. I don’t mind switching out the YM3414 for the YM3434 and have the tools to do so as long as I can keep the simultaneous mode. If not it really may be better to go a different route with these TDA1541’s and I don’t really mind that either, again this unit is parts and taking space so no big deal either way.
This stuff is new to me and I’m learning, albeit seemingly slowly in my old age. I have a very large library of music in mp3 and in the last few years I’ve been ripping WAV only. I have used this music for IPOD only as I have always listened to great music from CD players in a home system. I currently have several working TDA1541 players including a working CDC4A wS1, but I see the writing on the wall. I have acquired TDA1541/A’s and would like to use them since I like the sound. I don’t really have any hi res music files.
I don’t mind acquiring a device or devices to input the appropriate signals, I’m just not sure what I would need and don’t mind suggestions there either, in fact I would very much appreciate them. If this is too complicated right now or impossible due to incompatibility I can also accept that but I really do want to play with this stuff so I’ll probably keep on it anyway.
Thank you again sincerely,
Mark K.
I suggested changing to i2s input because there are USB to i2s boards that are readily available. Yes, simultaneous mode is superior if all else is equal. However replacing all of the existing input circuitry with a new circuit based on the current state of the art may yield better results that more than offset the change to i2s.
There were USB to simultaneous boards by Ian Canada and Audial in the past but I am not sure whether they are still available. So there may be opportunity to keep the simultaneous mode.
Edit:. Ian's board is i2s to simultaneous.
With a computer providing digital data via the USB input board, the opportunity is there to try non-oversampling and various oversampling frequencies and filters by software too.
There were USB to simultaneous boards by Ian Canada and Audial in the past but I am not sure whether they are still available. So there may be opportunity to keep the simultaneous mode.
Edit:. Ian's board is i2s to simultaneous.
With a computer providing digital data via the USB input board, the opportunity is there to try non-oversampling and various oversampling frequencies and filters by software too.
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Thank you Ben Mah,
So maybe USB to i2s to simultaneous to TDA1541A. Please correct me if I'm not interpreting correctly. If I am correct would I then bypass the YM3414 and insert signal after. I haven't yet ordered any YM3434 chips.
I think I've come too late for Audial, and will look into Ian Canada.
Thanks,
Mark K.
So maybe USB to i2s to simultaneous to TDA1541A. Please correct me if I'm not interpreting correctly. If I am correct would I then bypass the YM3414 and insert signal after. I haven't yet ordered any YM3434 chips.
I think I've come too late for Audial, and will look into Ian Canada.
Thanks,
Mark K.
Yes, if using Ian's board it would then also require usb to i2s. Ian's board also requires clock input but there are usb to i2s boards that do include MCLK output.
My suggestion of an usb to i2s board or i2s directly from a single board computer such as an Odroid C2 is to totally bypass all of the existing circuitry and input the i2s signal directly to the tda1541a chip.
I may be wrong but my thoughts are that i2s from a current state of the art board with low jitter crystal oscillators and reclocking flip flops connected with short leads to the tda1541a would be an improvement over the existing circuitry feeding the tda1541a in simultaneous mode. Usb to i2s boards and low noise regulated power supplies to power them are very reasonably priced these days. I see that the JLSounds board even has galvanic isolation.
You can always start with just usb to i2s and add i2s to simultaneous later.
My suggestion of an usb to i2s board or i2s directly from a single board computer such as an Odroid C2 is to totally bypass all of the existing circuitry and input the i2s signal directly to the tda1541a chip.
I may be wrong but my thoughts are that i2s from a current state of the art board with low jitter crystal oscillators and reclocking flip flops connected with short leads to the tda1541a would be an improvement over the existing circuitry feeding the tda1541a in simultaneous mode. Usb to i2s boards and low noise regulated power supplies to power them are very reasonably priced these days. I see that the JLSounds board even has galvanic isolation.
You can always start with just usb to i2s and add i2s to simultaneous later.
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