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-   -   Marantz CD-50 and CD-60, TDA1541, CDM4/19 (https://www.diyaudio.com/forums/digital-source/201057-marantz-cd-50-cd-60-tda1541-cdm4-19-a.html)

Mayday 5th December 2011 01:26 PM

Just for fun I tested the old regulated PS I built years ago.
Used a 6-0-6V/ ?VA EI.

This says nothing about noise etc, I know.
https://i196.photobucket.com/albums/...y/46902589.jpg
https://i196.photobucket.com/albums/...y/a923ee1c.jpg

tubee 5th December 2011 04:27 PM

An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.


Schematic is designed by R. Meijer, not mine. But sounds good.

Some pics:




Alst pic: On the left the 317's (current limiter)
On the right the 2 shunt reg for 7210 an 7220

Mayday 5th December 2011 05:08 PM

Thanks!
Saved the pic with the schematics :)
Why would one need a current limiter?

What are the values in ()?

tubee 5th December 2011 05:16 PM

Values of R are ondrawing. 7220 draws about 200mA.

A current limiter is to reduce power consumption on the shunt schematic, and to be safer.

Mayday 5th December 2011 05:20 PM

Ok, thanks!

Was wondering about the ones that have one value ie 100 followed by (475), 100(470) as an example.

tubee 5th December 2011 06:05 PM

100 is for the saa7220 and 7210

The higher value Resistors between () and small transistor are for smaller digital chips, eg: memory, dividers

Mayday 5th December 2011 06:20 PM

I see, thanks!

Mayday 6th December 2011 01:46 PM

Got some veroboards for regulators(and other stuff I might want to build) and 8pcs goldplated DIP8 sockets(for swapping opamps) today :)

In you guys opinion, is OPA2134 better then NE5532(original opamp) or should I wait and order LM4562's? Just wondering if the LM4562 is that much better then the OPA2134 I've got at home already?
I've just put a LM4562 in my Lehmann BCL clone, and this is my first experience with this opamp.
It's not nearly settled yet, so I can't say how it compares to the stock NE5532.

https://i196.photobucket.com/albums/...roboards_1.jpg
https://i196.photobucket.com/albums/..._sockets_1.jpg

As for regulator to the SAA7220, I'm thinking of going with the tracking preregulator, that's got to be an improvement to stock and seems easy enough to asseble on veroboard.

Mayday 6th December 2011 02:18 PM

If I use a regulated ps that gives 15Vdc(from a 2x120Vac ,with primaries in series, 2x15Vac 10VA PCB transformer)
Use this schematic with an ELNA Cerafine 22uF for C2, didn't use C1, regulator fed from 2200uF Nichicon MUSE (get 25Vdc unloaded across this cap?!?)
Rectifying done by 1N4007, one rectifier per secondary so I can feed two regulator boards from this regulated PSU.
If this is a crappy idea, let me know and I'll go a different route.
https://i196.photobucket.com/albums/..._reg_LM350.jpg

For SAA7220 I was thinking this fed by the above PS.
https://i196.photobucket.com/albums/...0/TPR_reg1.jpg

I've also got 3 other transformers:
12-0-12Vac/1500mA
12-0-12Vac/500mA
6-0-6Vac/? mA, but it's a bit heavier then the 12Vac transformers.

Again, sorry if I'm asking for the ? time on any of this, or if I'm assault posting.

tubee 6th December 2011 05:13 PM

LM4562 is allrigt

For IV i prefer THS 4032 though


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