Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans

[res07njc]

it'll need sort of speaker delay , just because there is nasty voltage peak in startup sim

or a small knife switch on outputs ala Frankenstein?

 

[Zen Mod]

or teeth-crowbarr-startup protection

 

[res07njc]

Thanks for sharing.. with most parts already in hand I could actually build that! Safe to assume it wants a low Z input with a fair amount of volts? (<10?)

 

[res07njc]

duh.. answered my own question. It's a follower, can do lotsa input volts.

 

[Zen Mod]

it depends

I'm feeding my F4 Koan with few volts , in my workshop

mostly enough not just for daily FM enjoyment , also for occasional digital bursts

 

[Antoinel]

tnx

this is proof of a pudding ....... not exactly proof in a pudding

si , it is doable , Iq around 1A6 as predicted per spice

it'll need sort of speaker delay , just because there is nasty voltage peak in startup sim

this is far from optimised** , THD is 0.1% at 1W , though THD spectra is schweeeeeeeeeet

**demanding both more time with LTSpice and then real deal - playing with it in vivo

Hi ZM. Interesting circuit. Pls check FET Vgs values; -5.3V for P-MOS and -3.8V for SIT?; reversed?

 

[Zen Mod]

I'm certainly dumber than LTSpice

though , even if I'm finding it really useful , there are some surprises always , in vivo

however , you can count that that sim is pretty good for start

 

[indra1]

Hi ZM, if possible, could you kindly share your 4n35 model? I am searching a model that fits better to M2 operating condition. Thanks.

 

[Zen Mod]

hope this is it ; really can't remember 4N35 was in LTSpice , or I imported model

 

[indra1]

Thank you sir.

 

[Zen Mod]

tnx

this is proof of a pudding ....... not exactly proof in a pudding ......

**demanding both more time with LTSpice and then real deal - playing with it in vivo

Mr. MR , have you SJDP model , too ?

and , just now , I'm having an idea of trying it with cascoded LU ...... it would allow full blast (meaning regular FW range of PSU voltage ) version of amp

will sim tonight ....... and just dream when I'll have time to try it in vivo

 

[2 picoDumbs]

Forgot about lu.
I have about 50 just laying around.

 

[Zen Mod]

tried superquick and short sim

damn promising

 

[2 picoDumbs]

Nice one

 

[Zen Mod]

another proof that pudding exists

real pudding is on da Bench

startup behavior pretty benign , no need for speaker delay

cascode voltage fine-level trimpot advisable , you can put pot there and call it Zen Amount Pot ........ something as in PapaSit-1

 

[Zen Mod]

or you can call it Papapot

 

[nicoch58]

 

[Antoinel]

Great and good news ZM.

 

[Samuel Jayaraj]

Which resistor values need to be changed for bias setting? Thanks.

 

[Zen Mod]

R2,R3 ..... keep their ratio

though , I wouldn't recommend changing anything in circuit without prior confirmation in Spice

except if you know what you're doing ....... in which case you wouldn't ask for those resistors