Hi all:
I´m designing a tube power amp "approximaton", in which i simulate the trasnfer curve of tubes using a diode ladder, to get sucessive gain reduction versus output amplitude, like compression..

After that i added something similar to the marshall output impedance simulator (http://www.freepatentsonline.com/5467400.html), but instead of a opamp, i´m using a transistor as a gyrator, and some other values for components..

i tried to do the same thing with CMOS inverters and twin-t filters on feedback, but somehow i don´t get the same kind of response, looks like phase shifts don´t let me mix the treble boost with the bottom peak in a nice manner (like the marshall ckt does).

so, i decided to keed the marshall type simulator..but i´m worried about IP..maybe, eventually i could sell this things, and i wouldn´t like to get "cease and desist" letters from them..

a penny for your thoughs....

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..