well i hope so!!
i know that there are a lot of fake stk chips so i have to check them out before buying

for this i´ll use this seller:

http://www.cm2.cl/busqueda.php?b=stk402&btn=Buscar

they have a wide variety of chipamps , but no LM4780...

Quote from: jfetter on January 22, 2009, 11:42:59 AM
I attempted to use them but found they were difficult to obtain. They also did not seem stable as far as future availability.

Well here in chile seems to be plenty of them and they are pretty cheap..in fact LM3886/4780 are very hard to get, and they cost the same or more than a STK chip of the same power..

It seems that the main reason for not using STK is availability..and not quality..but i´m not planning to make them massively..just 1 or 2 of them..

guys..if i design a PCB for it, will you help me to debug it?
i´ve had experience designing layouts for preamps, but i´ve never designed a pcb for a power amp..AFAIK they are more sensitive than preamp layouts...

wil you help me?

well..so far i had no trouble finding datasheets for stk chips..

for example..check this one out:
http://www.steveselectronics.com/files/STK402-120.pdf

it´s a 80+80W, +-39V, 6 Ohms, 15 pin power amp..it looks pretty good from a thermal and performance standpoint, and here in santiago it costs 10 bucks!!

In theory, you can build a really powerfull stereo guitar amp, and even use current feedback..unless you use both channels in BTL configuration...

interesting....no replies about them.. are they a tabu or something?

hi all, i´ve been checking out different options of chip amps (or maybe called cheap amps?),
and one that caught my interest were the STK402 series...they go from 2x25W up to 2x120W and look pretty nice from power dissipation and thd point of view..i´ve searched a lot about them, but there´s no more info than the datasheets..and nothing in this forum..

anyone had experiences with STK chips? are they good enough?

Hi there!! i just joined this forum, inspired by the amazing book from Teemuk. I´ve been an electronics hobbyist since 2005, and built 2 tube amps and some TDA2050 prototypes that i never finished.

I have designed and built some original OD´s and other like the multicabsim cabinet simulator, and i´m passionate about guitar electronics.

Well, i´m tired of tubes and their cost and risks, so i´m planning to design and build a nice SS amp that´s cheap, easy and with good features..

what i have in my head and the idea "seed" is using a LM3886, i have a 2Amp 2x24V transformer (i know is a little short but it will work ok if i dont push the amp too much, too long)..but i don´t want to stick with the data shhet schem..i would like to include mixed mode feedback, to have "presence", "resonance" and "damping" controls. Something tells me that since it is practically an opamp, it may be easy to implement..is that feasible? done before?

also i would like to add a dynamic frequency response filter, to mimic what saturated output transformers do..teemuk´s book has some nice examples, but i think i´ll rather design one of my own playing with band pass filters and LDR´s, just for fun..

after this first idea works, i´l planning to make an stereo version or bridged..for more power..although 60 W seems to be loud enough..

as some help from you guys i would like to ask if there´s any lm3886 LTspice model out there?
any comment is welcome..

one of the things i hate about heatsinks is their price..
it´s prudent to make your own heat sink?
i always think to make my own using a long strip of tin and bending it like an accordeon..
would that work ok?