Interesting use of adding capacitors to improve the audio output. I was wondering if putting a small value capacitor in parallel with a larger value capacitor improves the audio performance more than just meeting a calculated capacitance value for the circuit ?
Great project. Thanks for sharing. I have a cheap TeraDak PI DAC hat with eight TDA 1387 chips. It does very well to my ears for a streamer and DAC rig < $150. Even better when fed by an LPS.
Have you ever tried with better output operational amplifiers. I think this Cd player uses 5532 op. I did with some CD players and DVD players. This immediately produced a marvelous result.
Thanks for the tip close 5534 I will in my own build I may try to keep the CD player somewhat original. But it is tempting if it is a drop in replacement. Do you remember what Opamp you used to replace the 5534 that worked for you?
I tried with the sony DVP-NS325. I used the OPA1656 from TI FET input. Single version is OPA1655. By the way, I couldn't find the output schematics of this Cambridge model.
Hello. The stripe on the capacitor indicates the beginning or end of the foil winding. In your case, they cost different channels. It is not correct to compare the sound.
Great Job my dude ! 😮 Love my Sony CDP 605 ESD But yeah Vintage flavor for sure . Mine only has 1 TDA chip ' but $1k in 87' the mech and laser are very good ! Bu-1 - if I ever recap I most likely will use Nippon Chemicon (blues) 😆 keeping it Japanese 💯
Very nice! Does I2S direct in like that allow you to run the chip in NOS mode? With enough mods and/or careful engineering, I think these old chips can meet or exceed most modern DACs.
Can you tell me if the data, ws and clk lines are legitimate outputs from the fifo or are they "hacked" from the pcb. It looks, from the video that the are availible from a second row of GPIO pins
You can get them from the Gpio pins or better from the ufl on the fifo in this video I got them from Gpio In this Video I took them from the ufl th-cam.com/video/XpC8GR3AY0I/w-d-xo.htmlsi=JeNTyxs-VOubaabV
One more quick easy mod. Most CDP of this era have an output filter. It will be a small cheap cap across the + - trace of each channel to cut off anything over 20kHz. Just snip it. Removing that cap will clean up the sound.
Thank you funny I was looking at the schematic and saw those and was wondering why they have a capacitor on the output that is going to bring the high frequencies down now I know thanks to you why. I will remove them. 😊🙏
Hi Thanks for this great video. Timely in my case as I have the earlier Cambridge Audio CD2 that has just failed with a mechanical on the CD mechanism and I have just been looking for a project to use the DAC part of it. I will follow with great interest
I wonder have you tested an output voltage? If it's near 0V you probably didn't need those expensive capacitors at all. Very often engineers added caps "just for a case" in a past. Despite of this, good choice though. PS It seems that line outs directly from NE5534. So, just short the caps (and replace 50c NE5534 with some better op amp like MUSES03, or AD797, or OPA211, or some suitable single op amp). You'll get all your bases and highs
Thank you there is a 1.4 v dc Planning to use some opa 861 I have had good results but will need to modify the circuit a bit Thanks for your valuable advice
The output capacitor change was very audible you can not, not hear it. When the quality is night and day different anyone can hear the difference. but I do see your point it is hard comparing 2 good quality caps.
I am guessing you are referring to the large Eatons UC's I used a long square piece of wood that slides in the triangle space at the bottom and it goes over the straps so it secures it down and sideways.
Yes, the large Eatons on the plywood. I see a black holddown between the 2 ultra capacitors, with what might be a shiny screw. I assume that holddown goes the length of the capacitors, overtop the lower cable ties and holds the Eatons securely to the plywood.
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Interesting use of adding capacitors to improve the audio output. I was wondering if putting a small value capacitor in parallel with a larger value capacitor improves the audio performance more than just meeting a calculated capacitance value for the circuit ?
Great project. Thanks for sharing.
I have a cheap TeraDak PI DAC hat with eight TDA 1387 chips. It does very well to my ears for a streamer and DAC rig < $150. Even better when fed by an LPS.
Personally i prefer the sound from the TDA1540 mono chip, its 14bit as Philips intended.
I can't understand the hype surrounding the slimmed-down economy model TDA1541. The TDA1540 is superior for several reasons.
Hi There Mr. Gabster.
Thanks for the video. ..good work.
Have you ever tried with better output operational amplifiers. I think this Cd player uses 5532 op. I did with some CD players and DVD players. This immediately produced a marvelous result.
Thanks for the tip close 5534 I will in my own build I may try to keep the CD player somewhat original. But it is tempting if it is a drop in replacement.
Do you remember what Opamp you used to replace the 5534 that worked for you?
I tried with the sony DVP-NS325. I used the OPA1656 from TI FET input. Single version is OPA1655. By the way, I couldn't find the output schematics of this Cambridge model.
I'll have a look at that straight away :)
Hello. The stripe on the capacitor indicates the beginning or end of the foil winding. In your case, they cost different channels. It is not correct to compare the sound.
Great Job my dude ! 😮
Love my Sony CDP 605 ESD
But yeah Vintage flavor for sure . Mine only has 1 TDA chip ' but $1k in 87' the mech and laser are very good !
Bu-1 - if I ever recap I most likely will use Nippon Chemicon (blues) 😆 keeping it Japanese 💯
Thanks TJ that is a nice CD player some of them can use a recap to get back to original status🙂
Enjoy the Journey love your Chanel
@Gabster1 I got to build me a streamer soon ' Maybe digital output only '
Very nice! Does I2S direct in like that allow you to run the chip in NOS mode? With enough mods and/or careful engineering, I think these old chips can meet or exceed most modern DACs.
Super work! I might finally get round to fixing my old tda cd players with broken drives, and turn them into streamers 🎉
Really interesting. I love Cambridge. How do you get I2S out of the RPi?
kabooom :) very cool project; had already thought about building something with a Phillips CD Pro 2 drive
Cool idea give it a try see if you can find the I2s lines if you do not have a schematic you can trace backwards from the Tda chip
Can you tell me if the data, ws and clk lines are legitimate outputs from the fifo or are they "hacked" from the pcb. It looks, from the video that the are availible from a second row of GPIO pins
You can get them from the Gpio pins or better from the ufl on the fifo in this video I got them from Gpio
In this Video I took them from the ufl
th-cam.com/video/XpC8GR3AY0I/w-d-xo.htmlsi=JeNTyxs-VOubaabV
wow 4 x TDA1541A that got to be a cool sounding Dac
One more quick easy mod. Most CDP of this era have an output filter. It will be a small cheap cap across the + - trace of each channel to cut off anything over 20kHz. Just snip it. Removing that cap will clean up the sound.
Thank you funny I was looking at the schematic and saw those and was wondering why they have a capacitor on the output that is going to bring the high frequencies down now I know thanks to you why. I will remove them. 😊🙏
Hello Gabi, thank you. Really nice video and idea!
Hi
Thanks for this great video. Timely in my case as I have the earlier Cambridge Audio CD2 that has just failed with a mechanical on the CD mechanism and I have just been looking for a project to use the DAC part of it. I will follow with great interest
Working on part 2,
I wonder have you tested an output voltage? If it's near 0V you probably didn't need those expensive capacitors at all. Very often engineers added caps "just for a case" in a past. Despite of this, good choice though.
PS It seems that line outs directly from NE5534. So, just short the caps (and replace 50c NE5534 with some better op amp like MUSES03, or AD797, or OPA211, or some suitable single op amp). You'll get all your bases and highs
Thank you there is a 1.4 v dc
Planning to use some opa 861 I have had good results but will need to modify the circuit a bit
Thanks for your valuable advice
Thank you for sharing your TDA1541A Journey I have a vintage CD player with that chip may be I will try something like that.
You should be careful that you don't fry the Chip, replacements are getting expensive 😉
I. Don’t think that the audio differences are perceptible, how are. You able to hear this?
The output capacitor change was very audible you can not, not hear it. When the quality is night and day different anyone can hear the difference. but I do see your point it is hard comparing 2 good quality caps.
Thank you for another great project. What kind of bracket are you using to secure the UcPure/UC to the board?
I am guessing you are referring to the large Eatons UC's I used a long square piece of wood that slides in the triangle space at the bottom and it goes over the straps so it secures it down and sideways.
Yes, the large Eatons on the plywood. I see a black holddown between the 2 ultra capacitors, with what might be a shiny screw. I assume that holddown goes the length of the capacitors, overtop the lower cable ties and holds the Eatons securely to the plywood.
Very nice job sir 👍👍👍👍👍
thank you