Going back to the Decoder clocking. Here is the circuit from the dac to decoder that is not in the manual.
Brent
An externally hosted image should be here but it was not working when we last tested it.
Brent
Then you haven't looked at my manuals yet 
http://www.raylectronics.nl/manuals/CD53_63_MKII_SE_KI_doc.pdf
See at the bottom of page 2.
Regards,
Ray
http://www.raylectronics.nl/manuals/CD53_63_MKII_SE_KI_doc.pdf
See at the bottom of page 2.
Regards,
Ray
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LOL That's slightly annoying. I only use my paper manual, i'll check my downloaded copies to see if it's on.
Also for anyone trying the mod run the clock signal in on a better 10pF cap and make sure you use the same clock as the dac clock or you will get ticking noises from the ics being out of sink.
Brent
Also for anyone trying the mod run the clock signal in on a better 10pF cap and make sure you use the same clock as the dac clock or you will get ticking noises from the ics being out of sink.
Brent
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Yes, there was! Way back when I bought my first CD67 I had the choice between the CD67-OSE (fl. 799,-) and CD67-KI (fl. 1399,-). The KI was too much for my budget
Ray
...so, Brent, just to recapitulate the decoder-story: You arranged everything as shown in the KI manual and then applied the clock signal to the (lifted) 390R resistor...?
You stated before that you removed some parts there and used a 1500pF cap....
I guess i'm running into trouble if i use a coax, because of its capacitance...?
Sorry, i have to ask because i'm not sure i understood everything and before taking the pcb 20 times in and out because something is not working....well....
Cheers,
Mickie
You stated before that you removed some parts there and used a 1500pF cap....
I guess i'm running into trouble if i use a coax, because of its capacitance...?
Sorry, i have to ask because i'm not sure i understood everything and before taking the pcb 20 times in and out because something is not working....well....
Cheers,
Mickie
You may as well ignore the earlier 1500pF set up!
Lift the 390ohm res and feed the clock signal to it through a good 10pF capacitor. The coax does cause problems due to the capacitance yes. This way is perfectly stable.
You can apply this mod without removing the pcb. Add a little solder to the leg of the resistor and whilst its hot lift it out of the hole (I assume you already have a clock fitted to the dac)
Brent
Lift the 390ohm res and feed the clock signal to it through a good 10pF capacitor. The coax does cause problems due to the capacitance yes. This way is perfectly stable.
You can apply this mod without removing the pcb. Add a little solder to the leg of the resistor and whilst its hot lift it out of the hole (I assume you already have a clock fitted to the dac)
Brent
Almost off topic but not quite, I'm about to order a couple of op amp for my CD67OSE (LM4562's), I'm also going to replace the op amps in my cambridge amp under advice to use opa2604's but given you guys like the LM4562's would you recomend I use those instead? I assume the LM's would be better but I don't know if that would be the case in all applications...
Your advice appreciated.
Tom
Your advice appreciated.
Tom
I agree with Ray. The 4562NA is a superb amp but sometimes can sound a little clinical. This depends on the capacitors and voltage rails feeding them, they also take quite a while to burn in. The ADs are a bit more forgiving. Please don't use the 2604 unless you like the sound of nails down the blackboard
You could try a lm4562ma and AD opamp (both smt) on an adaptor pcb. That's a pretty good combo. Or go the full distance and buy some Burson dual opamps, these are superb but also cost a lot more. Worth every penny though.
Brent
You could try a lm4562ma and AD opamp (both smt) on an adaptor pcb. That's a pretty good combo. Or go the full distance and buy some Burson dual opamps, these are superb but also cost a lot more. Worth every penny though.
Brent
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