Hi Simon
I have a CD53 where I implemented a dedicated psu for the servo chip. Should I use it also to feed the driver opamps ?
I have a CD53 where I implemented a dedicated psu for the servo chip. Should I use it also to feed the driver opamps ?
Ricardo,
If you like, but you need + and - voltages. About +- 15V-20V is ideal so you can feed 7812/7912.
Simon
If you like, but you need + and - voltages. About +- 15V-20V is ideal so you can feed 7812/7912.
Simon
OK! Since it was mentioned! I did it!!!
6 regs on the driver ic's. I've done exactly what Simon has been doing of late and removed the resistors and dropped the reg in using the screen as the earth. For the leftmost driver ic I shortened the wire links as I couldn't find the resistors as shown on the the circuit diagram.
As a pic tell a thousand words
and
The player is still a bit shouty for my main system but it awesome on the dinning room system which is much more forgiving! definately worth the 45mins to fit the £2 cost of the parts! if you've not done it DO IT!!!😀
6 regs on the driver ic's. I've done exactly what Simon has been doing of late and removed the resistors and dropped the reg in using the screen as the earth. For the leftmost driver ic I shortened the wire links as I couldn't find the resistors as shown on the the circuit diagram.
As a pic tell a thousand words
and
The player is still a bit shouty for my main system but it awesome on the dinning room system which is much more forgiving! definately worth the 45mins to fit the £2 cost of the parts! if you've not done it DO IT!!!😀
Woah, what a wiring job in there, I love it Ian!!!
It's quite hard to mod the "shoutiness" out of them, but certainly not impossible. A dual re-clock is needed for it, plus that mod you just did. 45mins is double-quick, I'd have taken 2 hours!
It's quite hard to mod the "shoutiness" out of them, but certainly not impossible. A dual re-clock is needed for it, plus that mod you just did. 45mins is double-quick, I'd have taken 2 hours!
Spectacular... I would need 1 week minimum... (I like to get organized before I fire the soldering iron)
You can remove the "shouting" by reclocking AND powering the decoder with dedicated psu + regs.
You can remove the "shouting" by reclocking AND powering the decoder with dedicated psu + regs.
OK! Since it was mentioned! I did it!!!
6 regs on the driver ic's. I've done exactly what Simon has been doing of late and removed the resistors and dropped the reg in using the screen as the earth. For the leftmost driver ic I shortened the wire links as I couldn't find the resistors as shown on the the circuit diagram.
As a pic tell a thousand words
and
The player is still a bit shouty for my main system but it awesome on the dinning room system which is much more forgiving! definately worth the 45mins to fit the £2 cost of the parts! if you've not done it DO IT!!!😀
Could you give the locations (items replaced) for each of the regs please? Are all earthed to a star ground?
Already done Ricardo, I guess I'm just happier and more used to the sound of a 1541 these days!!!🙂
they all run off the +/-10v rails. For the negs i used std 7908's and the pos I used LDO versions of 7808's. each of the driver ic's has a resistor or link feeding them. Remove the resistor and use it to supply the reg. put the output in the other hole created when you removed the resistor and connect the remaining pin to the earth screen on the top of the board.
I do use a star earth in this player but i didn't bother here.
An externally hosted image should be here but it was not working when we last tested it.
Ooh, neater than I did it Ian. I didn't use the holes so efficiently ie. regs using both resistor holes!
To this all-purpose threat and totally OT.
I you want dynamic (really dynamic) Jazz top quality recording, listen to:
Gerald Clayton - award-winning New York jazz pianist - Two-Shade.
😉
I you want dynamic (really dynamic) Jazz top quality recording, listen to:
Gerald Clayton - award-winning New York jazz pianist - Two-Shade.
😉
I like my jazz I think i'll give that one a try
Cheers
Brent
Edit - Bought from Amazon for £7.28 delivered.
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My 67' is on its way home from another trip to the UK. This time is has the DOS board ( Ray's creation and workmanship) and all the latest gubbins from Rowemeister like the SI caps) Thanks guys! This should be very interesting. I think I've come to the end if what I want to invest in this museum piece (famous last words...). Oh and I finally got rid of that disgraceful stock power cord and it's been replaced with something more appropriate (from Grover Huffman) and soldered directly to the board. No messing around here! After the appropriate burn-in I will report back. Thanks guys (especially Ray who took the time for me...there is a life outside audio...we sometimes forget!) I hope this thread isn't winding down, although it's hard to see where it can go furhter, but it's been a hell of a ride!
Yeah you need to put better regs on servo and decoder 😛
It is sounding much more competent now though
Brent
It is sounding much more competent now though
Brent
"It is sounding much more competent now though" Hmmm, damning with faint praise? More regs...why did I think the voyage was over?
You'll have to make that decision yourself. I'm sure you'll like that output stage, it is very nice.
The sky is the limit with these players...
Most important: enjoy it first! For a long time! You have a great player, so rediscover your CD collection!
Then, when the upgraderitis-virus becomes active again: contact this forum 😀.
Most important: enjoy it first! For a long time! You have a great player, so rediscover your CD collection!
Then, when the upgraderitis-virus becomes active again: contact this forum 😀.