Goldmund Mods, Improvements, Stability

[MJL21193]

Primary traces are too close to each other. You could locate the 110/220V jumpers under the transformer.

 

[keantoken]

Here is a schematic for the Value version.

- keantoken

 

[Krisfr]

Dang, And I thought I was done....

 

[keantoken]

Sorry Kris! Not asking you to draw a layout really... This version will probably be more appealing to most though.

- keantoken

 

[kbeist]

So.. what will be the differences between the Value version and the No-Expense spared version?

Max Vin regulated to ?V in both versions?
Adjustable V/A?

I'm just a caught in the headlights.

 

[keantoken]

The Value version has less input isolation. The Value has -130db isolation, and the other has -160 to -180db. The difference is within millionths. Salas uses the Value type in his circuits (the CCS part) without complaints.

- keantoken

 

[kbeist]

Nice!! Thanks.
I will have to try both!

 

[Krisfr]

Keantoken:

Is there that much difference in price between the 2?

 

[carlmart]

Perhaps because I'm getting here late, but where is the schematic for the No-Expense version?

Is that difference only related with the regulator or it affects the rest of the circuit too?

 

[Krisfr]

Perhaps because I'm getting here late, but where is the schematic for the No-Expense version?

It is here http://www.diyaudio.com/forums/soli...s-improvements-stability-143.html#post2415345

Keantoken:

Can we use 4 4148's instead of the 6.2 zener? I got tons of 4148's at a penny apiece. Working on new one.

And what are the "real" part numbers for Beefy1 and Beffy3?

 

[jacco vermeulen]

4 ?

 

[Krisfr]

I found the Beefy's 1N5819.

 

[keantoken]

The Beefies should be about 1A types, any one will do.

Difference in logarithmic scale is a bit different than difference in linear scale. The The Value version is -130db. That is over -60db twice. This means output ripple is less than a thousandth of a thousanth of the input ripple. For the other version it's almost -180db. This is -60db thrice. So that would be a little less than a thousandth of a thousandth of a thousandth.

So there are two options:

Value: a thousandth of a thousandth
Non-value: a thousandth of a thousandth of a thousandth

- keantoken

 

[keantoken]

I chose the zener because of the tempco. If you use the diodes, the tempco of them all combined will be multiplied by about 10. That implies a LOT of drift. The zener chosen gives the lowest tempco.

- keantoken

 

[keantoken]

The difference between The Value version and the other is entirely limited to the regulator and it's own performance as seen by other circuits.

Another detail I must mention. For the Value versions, R6 and R15 must be adjusted to that the Zener does not turn on during operation (it is only meant to turn on at the beginning to start the circuit). So during operation the voltage at Q5 and Q13 collectors should be below 33V (but not below 2V either). The schematic given was meant to be used with 90V input. For less input you may need to decrease R6/15. Misadjustment will not break anything, but the circuit will not perform to spec.

- keantoken

 

[Krisfr]

Gotcha

I was just sitting around and got board (bored) so I start playing with the mouse on my computer and this jumped up on my screen, what do you think?

 

[keantoken]

I like the compact way the C4793 and it's driver at the bottom middle are arranged.

- keantoken

 

[keantoken]

Okay, help me figure this out please... The row of buttons in the upper left are the available layers for me to use. I can identify solder mask, silkscreen etc. But which layers should I ignore altogether?

- keantoken

 

[MJL21193]

How many layers will your board have? Two is standard, top and bottom.
Most want a single layer (bottom).

 

[Krisfr]

Well my mouse got tired of playing with me and it went to sleep on me.

But just before he did ....