AYA II DAC - nabava dijelova

[audio kutak]

Inače u Farnellu ima Rubycon ZLG 100uF, 25V, sa ESR 0,065 što bi po tom kriteriju bio najbolji izbor. Promjer 6,3mm, znači stane na pločicu. Cijena 0,468EUR/kom. O tome bi se već dalo razmisliti.

joe, mislim da sam ZLG kondove stavio u tablicu, te iz Farnella??

ja sam rekao da sam naručio par komada tih ZA pa ako dođu, dođu, ako ne, nikom ništa... mislio sam ih isprobati
da dobijem (ako dobijem) neki utisak...

dečki, ispada da ja preferiram samo najskuplje i najbolje?? Pobogu, nigdje nisam spomenuo da preferiram skupe marke!
da je tako, morao bih prodati barem jedan bubreg da napravim "state-of-art" verziju ovog dac-a!!

Nijedna firma koju sam spomenuo nije skupa (allenBradley, prp i sl.), cijene otpornika su im kao u Farnella (altpro)
ili mrvicu više...

Nikad nisam kupovao najskuplje, uvijek mi bilo glupo davati silan novac za takve stvari.....ne vidim svrhu niti me zanima to.

tko želi neka stavlja što hoče i točka...

idemo dalje...

kada ide narudžba?

[Edison]

edisone, gdje sam igdje spomenuo da čipoteka drži nekvalitetne i jeftine dijelove??

Procitaj sto ovdje pise!

Što se tiče dijelova manje kvalitete, nisam ja taj koji želi ugraditi nekvalitetno i jeftino... nisam.... da je tako,
onda bih uzeo sve u čipoteci i vozi....

Uostalom, nije bitno. Nastavite dalje s nabavkom materijala....

[joe dalton]

Inače u Farnellu ima Rubycon ZLG 100uF, 25V, sa ESR 0,065 što bi po tom kriteriju bio najbolji izbor. Promjer 6,3mm, znači stane na pločicu. Cijena 0,468EUR/kom. O tome bi se već dalo razmisliti.

joe, mislim da sam ZLG kondove stavio u tablicu, te iz Farnella??

Jesi. Njih i ove 100uF, 10V. Ja bi tu stavio sve 100uF, 25V. Isti promjer, upola manji ESR.

idemo dalje...

kada ide narudžba?

Ne znam. Meni se ne žuri obzirom da nemam TDA.
Poslat ću listu svima na reviziju pa, ako je sve ok, možemo u narudžbu.
Ko će TME, a ko Farnell (Altpro)?
TME je oko 500 kn za sve, a Farnell oko 1670, odnosno oko 300 kn po glavi (neko manje neko više ovisno o varijanti).
Tko god bude naručivao iz Farnella bilo bi ok da mu ostali uplate lovu prije.

[audio kutak]

evo, maloprije sam otišao na CHIPOtekine stranice i tražio otpore... ima od 0,5w i od 13 potrebnih
vrijednosti imaju samo 5?! To je ono što mene smeta kada dođem kod njih u dućan... Također da
ne spominjem da mi se ne isplati ići po nedostajuće dijelove u još 2, 3 trgovine po Zagrebu i trošiti benzin...
Ako ništa drugo bar bi otpornike mogli imati na stalnom lageru... zar previše tražim? Iako, mislim da im
danas ta vrsta robe nije prioritetna da imaju u dućanu, tko želi naručit će si robu kod njih... i to se može...
danas se kupuju pleyeri, tableti, mobaci.....

Zato volim sve uzeti sa jednog mjesta, bilo Farnell, RS, Banzai...

[yoke]

da ne zaboravim...malo sam u guzvi...pa...
jutros primio mail od Pedje...jednostavnije mi ovako...
inace nikad ne postam sadrzaje mailova ali s obzirom da je ovo bitno za sastavljanje i da sad ne prosljedjujem svima ;


Unfortunately, there is a small but significant error at PCBs revision 0, which are regrettably already sent. It was one of those small things that were added last, prior to sending the design into series fabrication, and once was made the error was impossible to discover prior to putting complete kits into work. Still, I owe "thank you" to Antonio who was one day faster.

The problem appeared with lately added four pads (double sided, so vias) that provide direct current output from TDA1541A. These are located between TDA1541A and capacitors C405/C406. Pad (via) marked as LIO shorts TDA1541A left output (trace at top side) to ground (just beneath). Obviously, this one had to be one (top) sided pad, and not via.

Essentially, the solution would be to cut the connection that goes through the board. This could be done by small needle file or diamond file. It can be done with no major traces, but it would be still recommend to do this from the bottom board side. For the record, this hole itself is 1 mm in diameter, so the tip of the file should be smaller than that. Once you do this, please use DMM to make sure there is no connection anymore between pads at two sides.

It is important also to remember that, when using these pads to connect TDA1541A to external output stage, to make this connection at top side only, not going through the board with wire.

This information will be of course added into the next revision of assembly manual.

Please don't hesitate to let me know if you need any further help in this.

Apologies for inconvenience caused

and regards,

Pedja Rogic

[audio kutak]

to znaći da taj pad sa donje strane, možemo sa borerom od recimo 1,5-2mm samo malo površinski proširiti (skinuti
sloj bakra) i tako da nema spoja sa rupom te tako odvojimogornji i donji?

Ili, tko ima turpiju i slično, da "isturpija rupu"?

[audio kutak]

samo malo novost, tiče se principa Rubycon ZA elektrolita... citiram:

"The Japanese manufacturer Rubycon[21] was a leader in the development of new water-based electrolyte systems with enhanced conductivity in the late 1990s. In 1998, Rubycon announced two series, ZL and ZA, of the first capacitors on the market using an electrolyte with a water content of about 40%, which were suitable for a wide temperature range from -40 to +105°C.[22]

The improvement achieved in the conductivity of the new electrolyte can be seen by a comparison of two capacitors, both of which have a nominal capacitance of 1000 µF at 16 V nominal voltage in a package with a diameter of 10 mm and a height of 20 mm. The capacitors of the Rubycon YXG series are provided with an electrolyte based on an organic solvent, and can attain an impedance of 46 milliohms when loaded with a ripple current of 1400 mA. ZL series capacitors with the new water-based electrolyte can attain an impedance of 23 milliohms with a ripple current of 1820 mA, an overall improvement of 30%.

Other manufacturers, such as NCC,[23] Nichicon,[24] and Elna[25] followed with their own new products a short time later. The new type of capacitor was called "Low-ESR" or "Low-Impedance", "Ultra-Low-Impedance" or "High-Ripple Current" series in the data sheets. The highly competitive market in digital data technology and high-efficiency power supplies adopted these new components rapidly, because of their improved performance. Even better, by improving the conductivity of the electrolyte, capacitors not only can withstand a higher ripple current rating, they are even cheaper to produce, since water is very low cost compared to other solvents. Better performance and low cost drove widespread adoption of the new capacitors for high volume products like PCs, LCD screens and power supplies."

[yoke]

TDA su na putu prema RH...javim se kad stignu...
ne brinite, necu ih spajati

[audio kutak]

dobra vijest!

[Master of disaster]

Dobra vijest je da su na putu, ili da ih yoke neće spajati?