CDM Building questions

ken_diyzone.net · « **Reply #40 on:** 24 Jan 2005, 02:53 pm »

Kip,

All right!! Is funny, this happen all the time, all these chips and electronics in these things, and it always come down to a bad crimp, can't tell you how many times it has happened to me. I think next time before debugging, I'll say just check the wires first.

As for the operation of the player, unlike the commercial player, this machine does not read disk info automatically. When in doubt, push the "DTSC" button (I don't have the remote in front of me, but I think that is the name of the button) on the remote, and it will make the player read the disk info. When the machine is playing, the red LED is not blinking, right?

Regards,
Ken

Kip · « **Reply #41 on:** 24 Jan 2005, 03:03 pm »

The red LED is still blinking and the player will shut off while the cd is playing. This shows me the the control pcb thinks there is no cd in the player. One update that I feel should be made is an LED on the sensor board that will light when a cd is placed on the PRO transport. This would help in the adjustment of the sensor position and to help debug a sensor related issue such as this.
Down to the sensor board again. Player sounds good through my Audio Note DAC1.1x

SteveSun · « **Reply #42 on:** 24 Jan 2005, 07:30 pm »

Hi Kip: there is a function like that already: the lowest LED has two functions...

1. when the player is in stand-by mode, the lower LED will be steady on,
2. after flipping the toggle switch, with no CD, the lower LED should be flashing, and you should see: "no disk".
3. within 8 seconds, after you put the CD in, the lowest LED should be off. If you still see the lower LED blinking while CD is playing, you need to lift the CD sensor board higher, so that the CD sensor could read the CD contents properly. The ideal distance from CD to CD sensor that we tried in my machine is: 1/4 to 1/2 inch.

Kip · « **Reply #43 on:** 24 Jan 2005, 08:19 pm »

Hi Steve,

Thanks for the info. I read your comment and went and checked the sensor again. I placed a cd case 3/16" from the sensor and it worked! I adjusted the sensor and the board as high as possible and it now works perfectly.

I am very happy with this kit. My Audio Note DAC1.1x locks on to the signal perfectly. The dac in the CD-PRO sounds good too, but I can't say it sounds worse or better then the DAC1.1x. It does sound differant. A little more lively.

Now I want to find out how to configure the CD-PRO I2S output to EIAJ. It is possible through software http://diyparadise.com/cdm12kit.html My goal is to install an internal 0x oversampling TDA 1545 dac chip. The TDA only inputs EIAJ and I am told sounds better then the TDA 1543.

SteveSun · « **Reply #44 on:** 25 Jan 2005, 06:03 pm »

Hi Kip: you may notice that in you CD-Pro2M Kit, there is still some room to put "other things" into the chassis. In our plan, an internal I2S is on the road together with S/PDIF de-jitter, DAC. People should be able to see them in March or April. This I2S DAC will be based on 2 PCM1792 DAC chips wired for fully differential operation.

Kip · « **Reply #45 on:** 25 Jan 2005, 06:37 pm »

Hi Steve,

I am searching for an internal balanced dac. The dac you are working on sounds interesting. Will it connect directly to the I2S output on the PRO2M? This is the route I want to take.

I am considered the Philips TDA1543 dac chip using 0x oversampling running off the PRO2M I2S output, but now hear that the Philips TDA1545a dac is better sounding, but requires a EIAJ input. I do not want to use a receiver chip. I have done some research and found that the PRO2M can output the EIAJ format through the I2S bus by using the controller via a software change. Both TDA chips have a current output that I would convert to voltage with a resistor. They would both be single ended not balanced out.

SteveSun · « **Reply #46 on:** 25 Jan 2005, 07:20 pm »

Hi Kip: We will have an internal I2S DAC (directly using CD-Pro2M I2S digital output), and for some people who wants to use with their original transport, we also will introduce a de-jitter and a high-end DAC. More importantly, these three coponents can be used independently: internal I2S DAC allows you to by-pass the low-pass filter and use the LPF in high-end DAC, CD-Pro2M direct I2S digital out, thru De-Jitter then using I2S interface connect to high-end DAC, and so on...

Your TDA1543/5A EIAJ question: you need to modify firmware code to send you EIAJ I2S signal from CD-Pro2M module, which is something that I do not know how to do (I do not have the source code).