I want to make a dac with Toslink input and i have a PCM67 but unfortunately it needs separate data for L and R as well as clock signals, connected to it theres a filter ic that splits a digital signal down to these L/R signals, nut still theres these clock signals input. Whatr do i need to make this a SPDif dac ?
The digital filter is in place, OKI M6528-01, a ic i cannot find a datasheet on.
Where can i find a spdif receiver ? I dont wanna buy one.
Where can i find a spdif receiver ? I dont wanna buy one.
Tekko said:
Is this a cd player or something else? OKI digital filters are new to me.
That might be a problem.
Model No.? You are going to have to get a SPDIF rx from somewhere or your project is dead before it starts.
I dont remember the model, it was the kind with cd in the bottom, dual tape deck above and radio at the top.
A large main board alog the right side and two boards behind the front.
It was 2x25w with a stk module s poweramp that was a separate amp unit mounted in the bottom.
A large main board alog the right side and two boards behind the front.
It was 2x25w with a stk module s poweramp that was a separate amp unit mounted in the bottom.
The ics are, on the cd drive: CXA1372AQ. On the board: CXD2500BQ, M6538-01 and PCM67.
Pics:
Pics:
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An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
The M6538-01 is most likely a microcontroller. Follow the tracks connected to CXD2500BQ pins 71,72 & 74 to see where they go and do the same with pin 32 of the same chip.
They all go to the M6538-01 except one that goes to the connector that went to the front board with the buttons.
What are those two small ic's to one side of the the M6538 and where do pin32 of the CXD2500BQ and pins 14 and 16 of the PCM67 go ?
What do you plan to connect this board to ?
What do you plan to connect this board to ?
They are opamps, they go to the audio outputs of the pcm67.
The pins you ask for goes to the M6538 as well.
I want to make a dac that takes spdif (optical toslink) in and outputs analog audio for a amp i am building for the puter.
I dont want to use the soundcard analog out as it sound just plain horrible, it gives me a headache.
The M6538 is most likey just a digital filter, not a microcontroller.
Anyway i want the datasheet for it.
The pins you ask for goes to the M6538 as well.
I want to make a dac that takes spdif (optical toslink) in and outputs analog audio for a amp i am building for the puter.
I dont want to use the soundcard analog out as it sound just plain horrible, it gives me a headache.
The M6538 is most likey just a digital filter, not a microcontroller.
Anyway i want the datasheet for it.
Tekko said:
Pins 71, 72 and 74 form the CPU interface of the CXD2500BQ. If these three pins go to the M6538 as well as the audio data pins then it is possible that the '6538 is a filter and both it and the CXD2500BQ are under the control of a microcontroller elsewhere.
The M6538 may also provide digital volume control as well as being a filter.
Then you are going to have to get the necessary parts and connect them to the M6538 in place of the CXD2500BQ. You will need a TOSLink receiver and an SPDIF receiver and just maybe some glue logic.
Theres no digtal volume control, the thing had a regular analog one. I have located a spdif receiver, and i already have the toslink receiver ( i can steal the input one from the pc soundcard as i never use that)
So once i get the spdif rdceiver i should be good to go, if i can find out the values on the cap and resistor i stole from the board a few years ago.
That is why i need/want the datasheet for the M6538.
So once i get the spdif rdceiver i should be good to go, if i can find out the values on the cap and resistor i stole from the board a few years ago.
That is why i need/want the datasheet for the M6538.
Unless you know someone who has the datasheet or are prepared to pay for it, you will have to do without. All you have to do is mimick the output of the CXD2500BQ. You know the relevant pins on the CXD2500BQ, so all you have to do is disconnect them connect the receiver. MCLK might be a problem though depending on the receiver you use. What SPDIF receiver are you using.?
An old fat DIP model, CS8412. Seems that i might get it for just shipping from a nice guy on a swedish forum, he have used it but it should work still.
The YM3623, with its 384Fs MCLK, would have made things easier. The CS8412 has a MCLK frequency fixed at 256Fs. The PCM67 expects MCLK to be 384Fs, 192Fs or some other multiple of 24Fs and from your pictures, the M6538 is running off a 384Fs clock. This problem can be solved by running the CS8412 in slave mode and deriving SCLK and LRCLK from the oscillator driving the M6538 and PCM67.
The negative aspect of this is that it fixes the dac to one sample rate.
The negative aspect of this is that it fixes the dac to one sample rate.
I would go with the '3623. Designed to interface with J. A. Pan, Inc. format, as oppsed to Philps format, so it will drop in easier. Input stage has very little reflections, unlike '841x series.
I know someone who has lots......new and used......in his junque boit.
Jocko
I know someone who has lots......new and used......in his junque boit.
Jocko
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