Zen Mod

now, how to solve those issues ...... unequal Rail resistors , SIT parts with greater Ugs number ..... sometimes time is needed either to make space for new problems in thick skull, or just to have some leeway, then be able to step aside and look at problem from another point level shifter part, that's it small mosfet, so Ugs is sorta symmetric to big mosfet down Ugs, .... suddenly Rail resistors are sorta equal again, practically no gate currents to complicate things ( as is case with some not so well behaving Tokins) principal schm down; ignore MECH. principle fro now I think everything is clear, except note about LS resistor - its value is roughly SIT Ugs divided with current trough small Mosf/LS res./CCS ;say that you put value just being in ballpark; you can always go back and alter its value , to get wanted symmetry of lower and upper mosfet Ugs values

things are getting tricky when we want to use different part than Mosfet ( either up or down) , while using same biasing technique say SissySIT (DEFiSIT) - Toking Bigun is different to N mosfet in that way that gate voltage is opposite in sign (differene between enhanced vs. depletion mode parts, +4V-ish vs. -3V-ish) now voltage window between gates is no more twice 4v (+4V reaching down to -4V), now it is -3Vsomething reaching to -4V we are happy campers if we have SIT with Ugs no greater in number than, say , 3V7 , so we have big enaough voltage window between gates, to squeeze optotransistor in some P mosfets are having Ugs in range of -4V5, thus allowing as little broader batch of Tokins to be used, but that's just one more thing to take care with, endless parts picking ....... current through R+ and R- is, logically, one current; due to fact that gates are not symmetrical to output node, now R+ and R- can't be approx. same in value, resulting in few problems, of which most important one is that mains fluctuation resulting in sliding output DC offset , also parts TempCo playing game with Iq, then rails fluctuating down ( if not regged) etc. Luckily , I succeeded more or less in set of compromises while making SissySIT , both first one and R.2

M2 in more details; as said - it's relatively easy when we want to use source resistors as Iq reference points; I mean - easy when we got recipe from Mithrandir also easy when we are using lower and upper output parts having so-so equal gate voltages, opposite side of output node, meaning +4V and -4V optodiode connected across source resistors, series resistor to optodiode taking care that diode is not getting more than nominally 1V1 , at preferred Iq through source resistors opto transisttor is now MECH. , governing current through R+ and R- , everything is Wine and Roses

Main reason/objective for this - third iteration of same amp is twofold : - to enable use of any Ugs SIT ( so no more preferred range); - to feed that little Devil in my head, saying all the time - "you didn't make it properly, you didn't make it properly..... " I believe I succeeded in both To explain logic and problems, I think it's easiest to paste here few posts from LuDEF thread ( instead of putting links to them, I know many Greedy Boyz are if not lazy, they;re at least spoiled ) so, read this for fun .... if you already did, just skip down, unitil you see some porn posts Biasing Mechanismus: well, really nothing new under the Sun - meaning there is hardly anything specially new or unique that I put here even if Papa really started us Greedy Boyz playing with Square Law OS arrangements, thing is old as Wheel, in fact also - using rail series resistors, again Papa's bag of tricks ( for us) but again nothing especially new neither source follower ( which is introduced here in front of upper output device) used as level shifter is anything new ..... thing is - it's hard to make anything absolutely unique, and wishing just that is right recipe to get yourself in not making anything at all ....... so , studying schematics from everywhere and one can just hope to get in situation to stand on Giant's shoulders one day ...... one day ............ anyway - here is basic , lets call it , M2 biasing mechanismus; simple as that: we have R+ connected to upper part gate, we have R- connected to lower part gate, we have some variable impedance connected between gates; varying that impedance we are varying voltage sag across R+ and R- , thus positioning gates at appropriate voltage potential ( one vs. another) , thus setting how much Iq will pass trough output devices call that variable impedance Rvar, further Mech. , shorted of mechanismus cap between gates is there to eliminate AC to appear between gates - we don't want that ........ and also worth to mention - R+ and R- are sorta same in value , difference being just what we need to set output offset to 0 ( N gate and P gate voltages not exactly being identical)

Lenj da prekucavam, kao i obicno, pa ce samo copy-paste sa Big DiyA or - Look Ma, with no hands,Beast with thousand iterations!! Logic demands that main schm is here, and all future edits, if and when needed Few facts, for start, so when you ask, I can point you to this post: Rails - regular FW Format - in my case that is 300VA Donut per channel, 18+18Vac secondaries, two Graetz bridges per Donut Iq - 1A7 to 1A8 Autoformer - Cinemag CMOQ-4HPC OS - generic ( means don't care which Factory) IRFP9140 and THF51S Keratherm 86/82 pad for Mosfet, no-name silicon sheet for THF so, schm (as you can see, it is in fact simplified LuDEF ....... which is logical - this exactly lead me to LuDEF and few other Bstrd amps; stay tuned )

yup a njivu orem karakterom!

jbni bananistani se razlikuju samo po tome na koju stranu se (kobajagi) krste administratori

jok, propricao sam Eagle vise ne koristim ni mis ni tastaturu samo sedim i gledam u ekran

eto , ako nisam ja pametan, Vinko je

nagradno pitanje - ima li ikakovo racunalo (moze i prijenosno, jbte, da se uzajmi) da se instalira taj kod brace kupljeni ili bilo koji drugi player, da se skonta do cega je peeeeeeep - do DAC ili do racunjala

jbte, zaboravih obrisati Kuhlkorper oznake

eno trenutno retka prilika, na DiyA se prodaje jedan komad sa malo pocepanom membranom ....... cijena prava sitnica - okruglo tisuca $

ko onaj fazon sa Srbijancem i zlatnom ribicom od jedne zelje

koji ti uopste razmisljas o driverima, kad imas i 12 i 15" Tannoy? msm , moze iz sporta da se razmislja, al opet - da bi probao treba da se ulozi

on ce da plati postarinu da bi isao na poverenje, a ti se pitas koliko ti moras da platis postarinu ako te se ne svidja na poverenje? ja ne kontam ...... da probas sam da namotas trafo, pa da vidis kako je slati na poverenje .......

da mi ih umotaju u 2450 englenskih, pa da se razmisljam o patnji transporta vise od 200km

nem pojma, meni svira dobro al' opet - ja nisam merodavan, od onomad kad su mi slonovi na safariju prdnuli u oba uva

bar to nije tesko ......

ulozio sam celih 10 evropljana na limoondoo i nada se isplatila ispravni, sva 3 , eo meni pokazalnici za Singing Bush monoblokove e mislim , ovi su stariji od mene , JAT-ova tehnika od onomad

setih se, ikona iz proslosti - Portaflex serija

kontam da ti je ovo pohvala, ono, kao durabilnost ......

u zdravlju je koristio, dugo! tempted, ali realno nemam terenskog rada, niti zelim da ga imam omatorilo se

nekad sam ja malo bolje volje a nekad sam malo losije a ponajvise volim povredjene sujete koje me krenu podpikavati samo zato sto su pogresno protumacile ono sto napisah sta god da napisem, mislim tacno to sto je napisano dakle @Nesic - objavljuj sta hoces od uradaka jer je jedino to i normalno ovde, ako nastavis mene licno da cimas a ja primetim, banovacu te