Nice work Simon! Im planning on adding a similar regulator board for the dac and decoder. Ill add an extra tranny withdual 12v secondarys, one to run that clock and the other can be used to make a seperate supply for the dac and decoder. Anyone know were I can get some 7805 regs?? It says the LM7805's were discontinues on thier website and replaced by the lm340-t5?
imperfectcircle said:
Thanks, but altho I'd done this work before (and some more, small mods like chip shielding and resistor swaps), all of what you see was finalised/replaced by Brent.
Maybe if you're using just two secondaries, have one for digital (clock, decoder and dac digital psus) and one for analogue (decoder and dac analogue psus). Something to consider. But whatever separation you add will improve the sound a lot. 🙂
You can get 7805s anywhere (apart from maybe the supermarket 😉 )
disco said:
rowemeister said:
Well, dropping 15V at 30mA would dissipate almost half Watt. Enough to warm her up but not to get hot. Hmmm.
Im doing the mods on my new cd53 and I see that alot of you replace some resistors with chokes and ferite beads. Im having trouble finding a suitable choke thats available from Digikey. Any one have an idea?
Re: Ultra-Low noise 5V PSU
Well, Linear Technology is known for state of the art components. The 10KHz Output Voltage Noise is indeed low (6,5uV RMS), 100KHz would probably be 15uV RMS for LT1021-5. Price could be a consideration (my supplier doesn't stock 'm).
Regards, Jaap
NB Demands for a ref voltage are higher than for a regulator. Normally they aren't able to handle currents over 10mA, that's why the help of the ZBD949 transistor.
pantera6 said:
Well, Linear Technology is known for state of the art components. The 10KHz Output Voltage Noise is indeed low (6,5uV RMS), 100KHz would probably be 15uV RMS for LT1021-5. Price could be a consideration (my supplier doesn't stock 'm).
Regards, Jaap
NB Demands for a ref voltage are higher than for a regulator. Normally they aren't able to handle currents over 10mA, that's why the help of the ZBD949 transistor.
I just received my new cd53 that i bought on ebay for $30 and its working great. So now the real fun begins. I am starting friom scracth with this player and im making a parts list so i can place orders. Im planning on using Oscons for all the smaller caps in the digital sections and Silmics for the analogue stage. But for the larger main power supply caps im not really sure which caps to use, Panny FC, Rubycon ZA, Blackgate, Silmic, Stargets....etc Whats everyones opinions.
thanks
Frank
thanks
Frank
Well for me Black gates everytime, but they are alot more expensive.
I use pana FC in other players I mod with a plastic cap across the underside. This works a treat
Brent
I use pana FC in other players I mod with a plastic cap across the underside. This works a treat
Brent
Where do I buy a new CDM12.1 at cheapest ?
Grandata,
http://www.grandata.co.uk/acatalog/Grandata__CD_PICK_UPS_BY_PART_NUMBER_676.html
has it at £16 + £5PP but do I find it cheaper elsewhere?
Some total i.... has tried in the past to fix my "new" CD53 and has ruined the ribbon leading to the laser hence focus error now.
Anyone of you guys have a working spare you could - ehhh - spare 😉
Grandata,
http://www.grandata.co.uk/acatalog/Grandata__CD_PICK_UPS_BY_PART_NUMBER_676.html
has it at £16 + £5PP but do I find it cheaper elsewhere?
Some total i.... has tried in the past to fix my "new" CD53 and has ruined the ribbon leading to the laser hence focus error now.
Anyone of you guys have a working spare you could - ehhh - spare 😉
Attachments
avr300 said:Where do I buy a new CDM12.1 at cheapest ?
Grandata,
http://www.grandata.co.uk/acatalog/Grandata__CD_PICK_UPS_BY_PART_NUMBER_676.html
has it at £16 + £5PP but do I find it cheaper elsewhere?
Some total i.... has tried in the past to fix my "new" CD53 and has ruined the ribbon leading to the laser hence focus error now.
Anyone of you guys have a working spare you could - ehhh - spare 😉
I ordered a laser from Grandata and it was used. So i sent it back!!
Can you not run some thin wire to the points were the cable connects. It should be easy enough.
Also try these
http://www.dalbani.co.uk/electronic_components/cd_laser_pickups.php?p=5|
Brent
Can anyone tell me if besides the resistors in the output filter, are there any others that are in the analogue signal path that may benefit from a better quality resistor?? There looks like thier might be a few right before the rca jacks r657-66, r651,r652, rn15-18 are the ones im talking about.
Frank
Frank
imperfectcircle said:
You will be bypassing these resistors. They are for the muting circuit.
Brent
Thanks Rowemeister!! So the only resistors in the signal path are these??
R601...604
R607/608
R609/610
R605/606/611/612
RD21...28
I will be using Dale cmf55 .1% resistors in these spots since i already have them on hand. But im thinking if they are in the signal path maybe a better resistor is a good idea?? Maybe even going high end with Vishay s102, expensive though!! Maybe I could get some free samples. Most companies are pretty cool about small quanities of samples.
R601...604
R607/608
R609/610
R605/606/611/612
RD21...28
I will be using Dale cmf55 .1% resistors in these spots since i already have them on hand. But im thinking if they are in the signal path maybe a better resistor is a good idea?? Maybe even going high end with Vishay s102, expensive though!! Maybe I could get some free samples. Most companies are pretty cool about small quanities of samples.
On to more important things. My opamps and adapters arrived today. Im using a combo of opa134 and opa627 both are "dip" style and im using browndog adapter. This is the first mod ill be doing to the new cd53 i picked up the other day. Now a few questions.
Ive read that I should put a small cap across the power pins from + to -?? Do I do this on each individual opamp or just on the adapter. Also should i put a cap from + to ground and - to ground?? What kind of caps would I want to use here?? I have some 33uf Oscons, would they work well or do I need a smaller film type?? I cant wait to get these babys installed, im hoping for a nice upgrade going from the stock opamps to a opa627!
Thanks
Ive read that I should put a small cap across the power pins from + to -?? Do I do this on each individual opamp or just on the adapter. Also should i put a cap from + to ground and - to ground?? What kind of caps would I want to use here?? I have some 33uf Oscons, would they work well or do I need a smaller film type?? I cant wait to get these babys installed, im hoping for a nice upgrade going from the stock opamps to a opa627!
Thanks