Thankyou,
yes it's silver coated. all peeceebe process have done manually.
i enjoy all processing step. it's Do it Myself.
Layout link :- Post 3048
Schematic link:- Post 3056
You can use them in parallel in SSA without any special modification to the amp. IMHO the VAS should drive even 4 pairs 2sk/2sj with ease.
lucky me, i source locally and i found ready to use solution. no need to mixing of chemicals.I saw one DIYer silver coating his pcb in You Tube , it looks complicated though mixing these 3 types of chemicals, it looks like a chemist job
Naf, what is this immersion silver you mentioned, can this product be purchased locally? I have read silver nitrate is very expensive.
Yo naf.
I can hardly wait to see the complete board with parts soldered.
Me too and some LEDs shining on.
OHHH? Nice, very nice. Sonic surprises are waiting for you.
Lucky me (again) i found this thread
Yeah me too.
But would you listen my funny story with SSA? Go back to posts of September of last year, and you will see SSA was pure tragedy for me. I ended up with a hum generator and possibly an oscillating RF transmitter.
I gave up.
But...
The sound I heard from my speakers with that fail-built SSA was something I couldn't achieve with any of my later amplifiers.
Confused, I gathered a lot of courage and calmed my mind and attempted the SSA again in July this year. I was determined to make it work. I went through ALL the SSA thread and found hidden treasure like information which helped me build the amp successfully in FIRST attempt. The day I started soldering was they day I was listening to music, with NO hint of any of the problems that attacked me last year. Happy ever after.
I rarely failed in building amplifiers. But when it happens, it is strange, I always throw away the stuff, bury it somewhere and don't want to see it again.
Now I remember I have 3 modules with expensive parts somewhere. I even have one complete amp with a very good casing and a very good transformer (every layer of winding is separated by paper), but I don't remember where they are now
Just to insist on the fact that ceramic caps are mechanically resonant (A little like Quartz), and, so not so good on the signal paths. Better avoid them and use other technology (film).
About the value of the Cr cap. (To answer to AndrewT ), It present no advantages (Phase response) to reduce the bandwidth of an amp by oversizing compensation cap, OMHO.
Just try to compensate with the littlest value for a flat HF response curve, Loudspeakers connected. Of course, make sure the amp is stable with no oscillation.
Test this both with real Loudspeakers cables ended by a resistance as a charge at full modulation signals, ans real loudspeakers with small signals.
Then, look at the square waves, and compensate any overshoot tuning input low pass filter cap.
My two cents.
That was fast shaan
The size of the board is still to big when viewed. Even when I select View - actual size.
This is because my PCB software does not output pdf and I had to use online image-to-pdf converter.
I think you can scale the material to custom size in the print options. Also, inserting the png in an A4 page in word processor like MS Word will allow scaling the image to exactly 3.5x3 inch while keeping the sharpness intact.
i use faststone image viewer, setting it to correct size 3.5 x 3 inch and print it to pdf using pdf factory.
And here may final board.. just to make building this beautiful Amp more easier for rookie builder like me
tomorrow i'll source all part and start to build.
wish me luck.
thanks
Attachments
OMG, i miss 1k2 in my material list ...
ok i'll series 1k + 220r resistor. Dear Shaan/LazyCat is this ok with this series resistor?
btw here my progress.
thanks
Yes 1K+220 is perfectly OKAY(I am doing this too). In fact, you may need to modify these values after checking the initial bias, which may not be optimum at first.
Board looking good with parts.
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