Babelfish M25, SissySIT - general building tips and tricks

[Zen Mod]

I made this one, and labeled it - for 2 Donuts , each having 1 NTC per primary

so , 2 pairs of input wires , 2 pairs of output wires

with some simple ingenuity , it can be used for whichever arrangement you need it

post sketch of your intended Donut(s) , and I'll edit your sketch to accommodate your needs

 

[flocchini]

SissySit is up and running thanks to ZM

WOW

Initial comments Smooth natural sound with deep soundstage

Clamp meter is a jewel

 

[Zen Mod]

Fugly!



are those some industrial diode bridges?

 

[flocchini]

found them on line

also have another supply that uses "standard bridges"

 

[hifibluedevil]

before I spent some more cash on this addiction, can I use two 160VA, 2x18 @ 4A toroids I have in my stash, one for each channel for SissySIT? I may not get the full swing but I am OK with 10-15 watts/channel.
TIA

 

[Zen Mod]

shoot for little lesser Iq , 1A5 or 1A6 and it'll be jolly - if these Donuts are of good quality , they will not complain with constant load of approx. 50% of their capacity

 

[hifibluedevil]

shoot for little lesser Iq , 1A5 or 1A6 and it'll be jolly - if these Donuts are of good quality , they will not complain with constant load of approx. 50% of their capacity

cool, thx zen, they are good quality custom made by Toroid Corp. of Maryland

 

[Zen Mod]

the you're Happy Camper , same as I am with little ones I'm having in DEFiSIT :

 

[dBel84]

SissySit is up and running thanks to ZM

Congrats, came together nicely.

.. dB

 

[hifibluedevil]

I am having a brain fart, how do I connect two 2x18 secondaries to the power supply board? use a dual power supply board? Four bridge rectifiers? Has been a while doing solid state...

 

[Zen Mod]

read this thread from start , covered

 

[hifibluedevil]

Found these in my stash, tea-bag`s PS boards, so one board for each site (separately L and R channels), four bridge rectifiers, two 2x18 transformers feeding each board, complete independence. I will lift the boards and run the AC lines under all the way to front area where the toroids will live.

 

[Zen Mod]

hope this helps , post #113

principle is what matters , observe it as one channel PSU

 

[dBel84]

the you're Happy Camper , same as I am with little ones I'm having inDEFiSIT

What a wonderful life to be the ever omnipotent, omniscient, omnipresent ZM.

 

[brianco]

.......he's a good modest helpful guy too!

Don't know where he finds the time!

 

[Russellc]

Found these in my stash, tea-bag`s PS boards, so one board for each site (separately L and R channels), four bridge rectifiers, two 2x18 transformers feeding each board, complete independence. I will lift the boards and run the AC lines under all the way to front area where the toroids will live.

Those are great PS boards. Use them in all my builds except F5, first diy Pass amp. My favorite power supply boards, tea makes them bomb proof.

Russellc

 

[hifibluedevil]

Thx Zen Mod, that is what I looked today. It is slightly different then my boards which don't have the holes for NTC C-60 or whatever thingies but I will add them on separate terminal blocks.

 

[dewdrop]

Short of one elusive eyelet for the SIT before I can get the amp tested this week, almost there. Can wait to join this club.

 

[dewdrop]

Started to do the adjustments with the help from Song. The left channel behaved and we were able to achieve the 20mV and 0mV input offset but the right side is stuck at 180mV and unable to go down. We used a variac and the input current draw was 400mV which seem high.

Any advice much appreciated.

 

[Zen Mod]

first confirm that you have 5V at output of 7805

then recheck all small diodes , number and orientation , take care of note for ZD1

proper placement of resistors is imperative , as always