CD 300 with CDM-0 and dual 1540

[tubee]

Btw: i once managed to let a 1541 give the subcode data on my speakers, mixed with R-L data: divided the clock signal to 1541 /2 in NOS, but it has to be /4.
I know now the 1541 doesn't like this, it gets

What i heard was only digital noise.

 

[phimor]

Hello phofman,

even if tubee is losing interest, I'd be grateful if you post he revised schematics.

Thank you.

A NOS 1540 sounds like fun.

Cheers

Philippe

 

[tubee]

even if tubee is losing interest

Thats not the fact.
I am still very interested, but don't want to pressure Phofman.

 

[rfbrw]

A schematic for one i.c. ?

 

[phofman]

Honestly, I would prefer rfbrw do it, should he agree. My experience with logical circuits is limited when compared to his and the schematics will not be tested in real before publishing. I am sticking to the 4bit counter version which I know for sure works.

Whichever way you go, I suggest you reclock the NOS LE signal with the OS LE signal going to 1540s in the nonmodified version.

 

[phofman]

How will the schematic look like then?

But if you don't want waste (a long) time on that schematic to draw i don't mind, and will figure it out myself, because i want to finish some other projects first (cdp with 4 dacs, speakers, turntable) so i have no time left to change this 14 bit machine yet.
The 4 paralleled 1541 CDP with shift registers in NOS is allmost listenable in a few weeks i guess.

Sorry, it's not about wasting time, but drawing an untested circuit. My experience with digital circuits is not big enough to be so confident.

Basically it should be two D flip flops for each data signal (right and left), both clock inputs connected to BCK (CLCF) clock, the data going to D1, Q1 -> D2, Q2 -> data input of 1540. This way you delay the data signal by two clock ticks. In fact, you will need two 7474s as they are only dual. Maybe there is a quadruple version.

But the counter solution is tested and has actually lower nb. of ICs. The 7HC125 drivers are optional.

 

[tubee]

Thanks Phofman,
I have no huge logic knowledge either, but the logic i used so far still works

btw, the 74/174 could be the hex version of 74/74, but i have to look in the datasheets then.

Sorry, i go now, will proceed with my surround back & center speakers.

 

[jives11]

Hello phofman,

even if tubee is losing interest, I'd be grateful if you post he revised schematics.

Thank you.

A NOS 1540 sounds like fun.

Cheers

Philippe

Check this out then :

http://www.diyaudio.com/forums/showthread.php?postid=888782#post888782



" It looks sooo easy"

 

[marc brown]

Here's a NOS 1540 w/ tubed output.

CD104 lampizator

 

[tangband]

saa7010 instead saa7000 for nos

at first
sorry for my poor english
my question is
in my cdp 151 phillips
with 2 tda 1540
ist it

 

[tiefbassuebertr]

This thread could be also of interest in this case:
http://www.diyaudio.com/forums/showthread.php?t=40682