I believe that you can get some really decent shunt regulators from Tentlabs.
For the price, you'll be hard-pressed to beat them, I think. Also their footprint and heat-sink design is quite nice.
For the price, you'll be hard-pressed to beat them, I think. Also their footprint and heat-sink design is quite nice.
ozone_stink said:
160€ for 5 regulators - not cheap mod, is it worth it? it's almost half of that cdp price.
is there any suggested fixed output LM.... regulators by National Semiconductor?
found LM 317 AT/LT 317 AT but they are adjustable...
help!
ron
rnzr said:
Yes, if the rest of your gear is half decent. Easily worth the money. I'm using 2 Audiocom super regs and two Sercal S-Power regs and I just couldn't go back! I will be buying more of each I think. I've spent more upgrading my player than it cost me (second hand) but it just keeps getting better!!
Simon
I installed the AD8620AR's on Brown Dog adapters. I find the sound kind of muddy and "loud" for lack of a better term (really harsh treble too). It totally changes the sound signature. Will this clean up and balance out with a good burn-in? (its in the process right now)
As far as clocks go...where can I get a PCB for a Kwak Clock. How do I go about installing the Kwak in my Rotel? Do I just remove the two ceramic disc caps next to the crystal and the crystal itself? Where do I solder the clock's output then?
Any help would be greatly appreciated.
As far as clocks go...where can I get a PCB for a Kwak Clock. How do I go about installing the Kwak in my Rotel? Do I just remove the two ceramic disc caps next to the crystal and the crystal itself? Where do I solder the clock's output then?
Any help would be greatly appreciated.
colonelkernel8 said:
Try sending Elso an email:
elsokwak(a_t)yahoo(d0T)com
If you haven't fixed the clock, and believe me the clock in the RCD-02 SUX, then amplifying the DAC v-out with more 'accurate / transparent' op-amps will simply amplify & clarify the crap signal coming out of the PCM1732U.
Fix the clock, then tune. I also pulled that HCU04 (U601) out of the path and sent the clock to the common resistor (r633 or r635, I forget which - Ask Elso, remind him of Matt Wood's RCD02).
After changing the clock the highs improve considerably on that player.
ozone_stink said:
I think it's R635. Did you simply connect the clock output direct to R635 or did you remove the HCU04 totally from the circuit as well?
You are right about the clock, I installed a locally-made clock module which has the TentLabs XO on it and it's almost like another player. The glare in the treble which I had with the RCD02 is now gone. Overall it's a lot more musical as well.
Regards
CK
ozone, on second look at the schematic, I am not so sure now. R635 goes to pin 62 of U151 (CXD2545Q), R633 goes to U601 (PCM1732U). So when you said you bypassed U631 (TC74HCU04AP) did you connect the clock output to U601 or U151 or both?
Regards
CK
Regards
CK
I had just installed Kwak Clock 7 (DIY on a stripboard ) into my RCD-971 but much later I realized the coaxial digital out signal started to disappear resulting in no sound output. It had worked well when I had the thingy inside a dated Sony CDP just before it was transferred to my Rotel. There was no need to alter anything in the KC7 as both used 16.9344Mhz Xtal. The pot was adjusted to 0.55V.
My Rotel is also hooked to an outboard DAC for a different sonic character, thereon I can switch my pre-amp to 2 different sounds.
I sensed that the 10Mohm resistor parallel to the crystal was probably too large a value, replacing it to 1Mohm solved the problem. I'm wondering anyone faced this problem on the RCD-02.
My Rotel is also hooked to an outboard DAC for a different sonic character, thereon I can switch my pre-amp to 2 different sounds.
I sensed that the 10Mohm resistor parallel to the crystal was probably too large a value, replacing it to 1Mohm solved the problem. I'm wondering anyone faced this problem on the RCD-02.
Hi,
Can someone tell me how to get the TC74HCU04AP (U631) out of the circuit if I am using an external clock? I read what's posted previously in this thread but couldn't quite understand. Do I simply send the clock signal to both R635/R633 simultaneously?
Also, assuming I leave the HCU04 in the circuit, is R631 required? I've removed the C633/C634 which is part of the original oscillator.
Thanks!
Regards
CK
Can someone tell me how to get the TC74HCU04AP (U631) out of the circuit if I am using an external clock? I read what's posted previously in this thread but couldn't quite understand. Do I simply send the clock signal to both R635/R633 simultaneously?
Also, assuming I leave the HCU04 in the circuit, is R631 required? I've removed the C633/C634 which is part of the original oscillator.
Thanks!
Regards
CK
OK, I believe that re-reading the thread has started to refresh my memory.
I pulled one of the leads on each of the resistors R633 & R635.
In other words for each of the resistors, I de-soldered and lifted the lead that was closest to the HCU04.
Then I attached a wire from the clock-out to each of these resistors.
This way the clock signal goes as follows
Clock -> R633 -> XTI (pin5) on PCM1732U
AND
Clock -> R635 -> Pin62 on CXD.... chip.
As for the power lead for the clock, as Elso will tell you, it needs to go to the un-regulated digital supply. If you follow the schematic to one of the +ve pads of a digital supply capacitor and test it for the correct V, then you should be in business.
I would tell you which capacitor I used, but I no longer have this player and I simply forget which one. Elso knows. He'll hate me for that.
I pulled one of the leads on each of the resistors R633 & R635.
In other words for each of the resistors, I de-soldered and lifted the lead that was closest to the HCU04.
Then I attached a wire from the clock-out to each of these resistors.
This way the clock signal goes as follows
Clock -> R633 -> XTI (pin5) on PCM1732U
AND
Clock -> R635 -> Pin62 on CXD.... chip.
As for the power lead for the clock, as Elso will tell you, it needs to go to the un-regulated digital supply. If you follow the schematic to one of the +ve pads of a digital supply capacitor and test it for the correct V, then you should be in business.
I would tell you which capacitor I used, but I no longer have this player and I simply forget which one. Elso knows. He'll hate me for that.
Thats for bypassing the HCU04 isn't it?
I *think* the cap is C907. Its the largest cap on the very left edge of the PCB near the top. You will have to install a jumper so that you have the ground of the clock be the power supply ground too. (there is no negative digital supply on the RCD-02)
I *think* the cap is C907. Its the largest cap on the very left edge of the PCB near the top. You will have to install a jumper so that you have the ground of the clock be the power supply ground too. (there is no negative digital supply on the RCD-02)
You're probably right about the cap, but you'd best trace the schematic to be sure.
As for the ground, I would strongly advise against running the ground to the power supply. -You'd essentially be picking up all the noise and EMI crud (like an antenna) from the ground at PS back to the clock.
I believe a better approach would be to run your ground wire as close as possible to one of the -ve pads near the resistors that the clock out is going to. I believe I used the -ve pad of C601.
Hope that helps.
As for the ground, I would strongly advise against running the ground to the power supply. -You'd essentially be picking up all the noise and EMI crud (like an antenna) from the ground at PS back to the clock.
I believe a better approach would be to run your ground wire as close as possible to one of the -ve pads near the resistors that the clock out is going to. I believe I used the -ve pad of C601.
Hope that helps.
I think the name of the game is to keep the ground lead as short as possible.
You might even try connecting it to the ground side of J337 or J332.
You might even try connecting it to the ground side of J337 or J332.
Hi,
Thanks for your reply. I am not using the Kwak clock, but my clock vendor has also asked me to use the unregulated supply as the clock has its own regulator onboard. I tapped it from pin 5 of U931 (Vin) which has around 10V.
My clock output currently feeds pin 3 of the HCU04. Crystal has been removed. The 2 caps which forms part of the oscillator has also been removed (though it still worked well with them in place 😛)
Now I just need to get the HCU04 out as well, hopefully things will improve slightly. Your reply made it alot clearer on how to do this. Earlier on it was more like a riddle 😀
Regards
CK
ozone_stink said:OK, I believe that re-reading the thread has started to refresh my memory.
I pulled one of the leads on each of the resistors R633 & R635.
In other words for each of the resistors, I de-soldered and lifted the lead that was closest to the HCU04.
Then I attached a wire from the clock-out to each of these resistors.
This way the clock signal goes as follows
Clock -> R633 -> XTI (pin5) on PCM1732U
AND
Clock -> R635 -> Pin62 on CXD.... chip.
As for the power lead for the clock, as Elso will tell you, it needs to go to the un-regulated digital supply. If you follow the schematic to one of the +ve pads of a digital supply capacitor and test it for the correct V, then you should be in business.
I would tell you which capacitor I used, but I no longer have this player and I simply forget which one. Elso knows. He'll hate me for that.
Thanks for your reply. I am not using the Kwak clock, but my clock vendor has also asked me to use the unregulated supply as the clock has its own regulator onboard. I tapped it from pin 5 of U931 (Vin) which has around 10V.
My clock output currently feeds pin 3 of the HCU04. Crystal has been removed. The 2 caps which forms part of the oscillator has also been removed (though it still worked well with them in place 😛)
Now I just need to get the HCU04 out as well, hopefully things will improve slightly. Your reply made it alot clearer on how to do this. Earlier on it was more like a riddle 😀
Regards
CK
Help!
With the C633/C634 and the crystal out of the circuit, and my clock output feeding pin 1 of the HCU04, I occassionally experience static in the outputs of the CDP. If I power down and power up again, the CDP plays well. Anyone knows what's the possible problem? Is it to do with the analogue stage or the clock?
I've attached a part of the schematic for reference.
Thanks in advance.
Regards
CK
With the C633/C634 and the crystal out of the circuit, and my clock output feeding pin 1 of the HCU04, I occassionally experience static in the outputs of the CDP. If I power down and power up again, the CDP plays well. Anyone knows what's the possible problem? Is it to do with the analogue stage or the clock?
I've attached a part of the schematic for reference.
Thanks in advance.
Regards
CK
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