bqc:
Post #34 referred to the pinout from the CD-PRO2 unit itself.
I used the modified scheme posted on the previous page.
Post #34 referred to the pinout from the CD-PRO2 unit itself.
I used the modified scheme posted on the previous page.
Rarkov said:
Hi Gaz,
Your question is two days old: Do you have it already working?
If not:
I think that you have to connect digital GND from the I2S CDPRO connector to the TDA1543 input. In my system things refused to work without the mentioned GND.
Best regards,
Peter K
Hi Peter,
As it happens, I got it working earlier tonight. I had already connected the ground to the CD-PRO without luck - but because my PSU for the CD-PRO and DAC are seperate, I noticed a difference of about 2V between grounds. I didn't have a star ground for my test setup. I connected the grounds between the two PSUs and now I have sweet music! The only thing is a "CD spin up whirl and beep" when the CD first starts. Is this normal? Could just be lack of shielding or proper star ground?
Also, it seems my display unit is knackered. I am sending back to Nico to see if he can find the problem. He's been extremely helpful!
As a final note / problem...My speakers got a taste of -58V (whoops) and my Visaton MHT12 Ribbons didn't like it too much! Both the mid-basses and tweeters are fuse protected - which worked for the mids but not the tweeters. I took them apart and the elements are totally screwed! They look like someone has held a lighter underneath them!
Does anyone know if it is possible to get replacement elements? I really hope you can cause they are £111 each for the full units. Luckily my contents insurance convers accidental damage to hifi equipment - but I'd prefer to try and fix them!
Thanks,
Gaz
As it happens, I got it working earlier tonight. I had already connected the ground to the CD-PRO without luck - but because my PSU for the CD-PRO and DAC are seperate, I noticed a difference of about 2V between grounds. I didn't have a star ground for my test setup. I connected the grounds between the two PSUs and now I have sweet music! The only thing is a "CD spin up whirl and beep" when the CD first starts. Is this normal? Could just be lack of shielding or proper star ground?
Also, it seems my display unit is knackered. I am sending back to Nico to see if he can find the problem. He's been extremely helpful!
As a final note / problem...My speakers got a taste of -58V (whoops) and my Visaton MHT12 Ribbons didn't like it too much! Both the mid-basses and tweeters are fuse protected - which worked for the mids but not the tweeters. I took them apart and the elements are totally screwed! They look like someone has held a lighter underneath them!
Does anyone know if it is possible to get replacement elements? I really hope you can cause they are £111 each for the full units. Luckily my contents insurance convers accidental damage to hifi equipment - but I'd prefer to try and fix them!Thanks,
Gaz
Rarkov said:
Hi Gaz,
Congrads you got things working! Regarding the "beep" I am not sure if you hear the same as I do. While spinning up and stopping of the CD I hear a very "small" "mechanical" beep. There is no beep on the audio.
Regarding the speaker you could try speakerland http://www.speakerland.nl/Visaton-u.htm The side is in Dutch give me a message if you need translation.
Good luck,
Peter K.
Thanks Peter. I spoke to the British Distributor for Visaton yesterday (he's on holiday in France, so we didn't have a proper chat). He did say that Visaton prefer to repair their own tweeters rather than having the public repair them...However - being a DIY person, I had already taken them apart. I know what has to be repaired and would like to do it myself - cheaper!
We'll see what he has to say on Wednesday when he's back.
Gaz
We'll see what he has to say on Wednesday when he's back.
Gaz
Dac Decupling!!
Is there really any point in using such large caps for decoupling?!...those long leads with all their inductance should pretty much destroy any benifit they might add?!....
/micke
Is there really any point in using such large caps for decoupling?!...those long leads with all their inductance should pretty much destroy any benifit they might add?!....
/micke
Who knows. They do look good though. The only changes I got to try on the DAC before my display board went for repair was with and without the 47K resistors to ground. I didn't get to try for long and I did prefer one to the other, but I've forgotten which way around now! I'll have to wait till the board comes back.
On a side note, Visaton will only allow me to sent the units to them for repair. £50 per piece! That's £100 for the pair! 🙁
Oh well!
Gaz
On a side note, Visaton will only allow me to sent the units to them for repair. £50 per piece! That's £100 for the pair! 🙁
Oh well!
Gaz
Hello,
47K seems a little low if they are only used to eliminate thumps.. 1Mohm should suffice for that..
but anyway it would be interesting if you could compare the decoupling with some good SMD cap with as short trace as possible, preferably just between the supply pins (I mean att HF the via through the PCB will make a diffrence imagine what a couple of centimeters will do...)
well...just my 2c but anyway....
/ Micke
47K seems a little low if they are only used to eliminate thumps.. 1Mohm should suffice for that..
but anyway it would be interesting if you could compare the decoupling with some good SMD cap with as short trace as possible, preferably just between the supply pins (I mean att HF the via through the PCB will make a diffrence imagine what a couple of centimeters will do...)
well...just my 2c but anyway....
/ Micke
As it happens, I have a large number of SMD caps. I'll try one out when my board comes back.
I always value peoples suggestions 😉
Thanks,
Gaz
I always value peoples suggestions 😉
Thanks,
Gaz
PN components for PS
Hi Gaz,
very good work!
have you bought the PS components in RS WWW?
can you say me the part numbers?
Thankyou
Josep
Hi Gaz,
very good work!
have you bought the PS components in RS WWW?
can you say me the part numbers?
Thankyou
Josep
Hi,
Thanks for your comments. The components were nearly all from RS. Here are the part numbers:
223-9323 Transformer (15VA)
298-8508 Voltage Regulator, 1A, positive, L7805ACV
298-7000 Voltage Regulator, 1A, KA7809TU
268-098 Heatsink, T0220, 20degC/W
116-571 Capacitor, metallised polyester, 250Vdc, 0.22uF
426-042 PCB screw terminal, vertical, cable entry, std
426-086 PCB screw terminal, vertical, cable entry, low profile
365-4111 Capacitor, radial, wire ended, 105degC, 16V, 1700uF
365-4177 Capacitor, radial, wire ended, 105degC, 25V, 3300uF
160-360 Resistor, metal cased, power, 10W, 5%, 120R
160-354 Resistor, metal cased, power, 10W, 5%, 68R
140-7367 FUSE 200MA 5X20MM 19195
There you go...Everything you could possibly need! 😉
Hope this helps...
Gaz
Thanks for your comments. The components were nearly all from RS. Here are the part numbers:
223-9323 Transformer (15VA)
298-8508 Voltage Regulator, 1A, positive, L7805ACV
298-7000 Voltage Regulator, 1A, KA7809TU
268-098 Heatsink, T0220, 20degC/W
116-571 Capacitor, metallised polyester, 250Vdc, 0.22uF
426-042 PCB screw terminal, vertical, cable entry, std
426-086 PCB screw terminal, vertical, cable entry, low profile
365-4111 Capacitor, radial, wire ended, 105degC, 16V, 1700uF
365-4177 Capacitor, radial, wire ended, 105degC, 25V, 3300uF
160-360 Resistor, metal cased, power, 10W, 5%, 120R
160-354 Resistor, metal cased, power, 10W, 5%, 68R
140-7367 FUSE 200MA 5X20MM 19195
There you go...Everything you could possibly need! 😉
Hope this helps...
Gaz
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