I may use Ulfberht to convince you , ya funny Suede 
here it is - for buzzing Buzz creature
I expect to not hear of him for about a month ..........
here it is - for buzzing Buzz creature
I expect to not hear of him for about a month ..........
I would wait for thanks until it works.
He is using LtSpice after all. Has it programmed to whisper sweet nothings in his ear.
Buzzforb, ZM..... No hurry on the Netlist, here--I'm just starting to learn Spice (specifically LT Spice) here, too. I'm trying to figure out how to do netlist and/or schematic capture in LT Spice, as I type..... (I'm too old for all this "new technology" stuff.....!)
I'd like one eventually for the final ZM Fugly amp, whenever that might be!
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disclaimer - will check small details later tonight ; for now I'm sure 99% it will work as intended, last 1% pending my time
for both circs ( choke and CCS ) same apply - protective zeners for mosfet gates can't hurt ....... that and maybe few small details are grunschnabbel thing , so be aware
local caps decoupling , proper routing , proper grounding etc.
don't push it in B class
for both circs ( choke and CCS ) same apply - protective zeners for mosfet gates can't hurt ....... that and maybe few small details are grunschnabbel thing , so be aware
local caps decoupling , proper routing , proper grounding etc.
don't push it in B class
that one will probably stay unfinished , from moment they will bring me outa in a coffin
I don't need them , I just like to dream ( and just sometimes make ) them ; time when I need to actually make it is past now , after some mileage .
now , just to learn how to make them then sell them , that will be interesting (place here attached smiley )
well - not actually these Papamp knock-offs ....... but some other ones ; even if that's harder and harder - he actually covered all types one is able to make , in simple and pure way
btw. easiest way to share files is just sharing *.asc files , and accompanying models
I'm learning LTS too , just scratched it , in fact
Attachments
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I've tried using large toroids as loads for mosfets but ran into the problem where the mosfet's output Z shorts the toroids inductance below 100hz. How does this circuit get around that? For the most part choke loaded SS amps are only good from 100-a few Khz.
Tubes work because their plate resistance is hundreds of ohms. SS doesn't because thier Rds is very low.
Tubes work because their plate resistance is hundreds of ohms. SS doesn't because thier Rds is very low.
physics is simple - you have voltage loss of 6db where Lz is same as Ri of part driving it
so - tubes demands much greater inductance to work with , while sand parts are demanding much lesser inductance
but , as current goes up , keeping resistive losses in choke at minimum is must
play a little with this files , scavenged from VT52.com
so - tubes demands much greater inductance to work with , while sand parts are demanding much lesser inductance
but , as current goes up , keeping resistive losses in choke at minimum is must
play a little with this files , scavenged from VT52.com
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Zen Mod,
Nice tools.
I used a 200VA Anvil toroid that has two 117V primaries and two 18V secondaries as a push pull output transformer in the source of a differential e-mosfet long tail pair with poor results.
I did this understanding the primary inductance would need to be a few henery. DCR was <1ohm.
What results are you guys seeing in bench tests?
It would be great to get this working. We could build very simple class a and high powered class b amplifiers.
Nice tools.
I used a 200VA Anvil toroid that has two 117V primaries and two 18V secondaries as a push pull output transformer in the source of a differential e-mosfet long tail pair with poor results.
I did this understanding the primary inductance would need to be a few henery. DCR was <1ohm.
What results are you guys seeing in bench tests?
It would be great to get this working. We could build very simple class a and high powered class b amplifiers.
I can't remember what L values Magura is having in his big Donut amps , but you can count on mH , not H
there is long history of choke loaded amps , from first day of audio amplification , so it's superfluous to count how many times concept is proven
however - all you need to know is in that xls files , even if calc is simple formula , so you really don't need them
as Fo (for -3db point ) use 20Hz and you'll see
btw. with Magura's ( or even my ) approach - 200VA Donut is good for preamp
....... but - demands of split choke are simpler , comparing to real OPT which is having primary and secondary side ........ completely different beasts
- me played with 800VA CU core - isolation xformer from some old German TV set and Senisouth R550s ; have prepared some 1KW EI isolation xformers , but with negligible Rdc , comparing to previous one ; though , Mithrandir pulled me back to SE area lately ....
there is long history of choke loaded amps , from first day of audio amplification , so it's superfluous to count how many times concept is proven
however - all you need to know is in that xls files , even if calc is simple formula , so you really don't need them
as Fo (for -3db point ) use 20Hz and you'll see
btw. with Magura's ( or even my ) approach - 200VA Donut is good for preamp
....... but - demands of split choke are simpler , comparing to real OPT which is having primary and secondary side ........ completely different beasts- me played with 800VA CU core - isolation xformer from some old German TV set and Senisouth R550s ; have prepared some 1KW EI isolation xformers , but with negligible Rdc , comparing to previous one ; though , Mithrandir pulled me back to SE area lately ....
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Party time in donut thread!
You know buzz, there are the guys who follow the trends, and there are they guys creating the trends😉
Trend-setters , ya mean ?
I'm not seeing them around in multiples
spoiled brats and Mithrandir
( common denominator of all spoiled ones is that they enjoy not being responsible ..... moi first)
I'm not seeing them around in multiples
spoiled brats and Mithrandir
( common denominator of all spoiled ones is that they enjoy not being responsible ..... moi first
)
ZM. Heres your first lession in amp-selling: Trend-setting has zilch do do with originality or geniousness. Its all about spin-doctoring
Hey ZM. Does the cable thing go for power cables. I got stranded soldered everywhere.
Nuthin new under the sun.
Nuthin new under the sun.
DoDos
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