Aleph J Schematic

[Zen Mod]

How about I post what I'm studying now? Your comments are valued; I'm not intentionally playing games. Sometimes I'm just a little dense in the head:

well - I didn't say that I don't like you games

anyway - what's role of these Q10 and Q11 , across R34 ?

something is redundant ........ I bet both Qs .....

please - go back and re-read several posts in Aleph J thread where EUVL's proposal is ..... there is exact ( and almost sole) concept how that can be made ;

now you're trying same few things I already drew ..... wasting volts in negative PSU..........

 

[carpenter]

now you're trying same few things I already drew .....

Why, that's a fine compliment.

Q10 and Q11? The sim really likes those jfets! The current goes up to 6mA with and practically nothing without them. In fact, the output from the diff pair is much smoother with them, as well. I'll study Patrick's ideas, but I don't think you're so far from the bulls-eye.

 

[carpenter]

Hey Choky, look at the graph and especially at the LU1014D gate voltage. It's practically on the floor. Not much wasted voltage there.

 

[Zen Mod]

Why, that's a fine compliment.

Q10 and Q11? The sim really likes those jfets! The current goes up to 6mA with and practically nothing without them. In fact, the output from the diff pair is much smoother with them, as well. I'll study Patrick's ideas, but I don't think you're so far from the bulls-eye.

either I'm dumb or your sim is

try this one ;

it's not A J , but it's X-ed

 

[carpenter]

either I'm dumb or your sim is

try this one ;

it's not A J , but it's X-ed

I added several pics to my previous post, Choky.

I'll sim your drawing and see what it does. This is the easiest way for me to learn.

 

[carpenter]

Latest effort:

 

[Zen Mod]

Latest effort:

R34 - 10K !!



you really make me that I must draw something ( by hand) ........


but later ........

 

[carpenter]

R34 - 10K !!



you really make me that I must draw something ( by hand) ........


but later ........

Stock 1K for R34:

 

[carpenter]

I raised R19 to 150K; that brought back a sine wave... What do you think?

 

[Zen Mod]

I raised R19 to 150K; that brought back a sine wave... What do you think?

are you sure that you don't have some Serbian ancestors ?

sometimes you're same as fast & stubborn as serb

look here - just as example ;

LU gate MUST BE REFERENCED TO - 24V , where also source must be connected ,via source resistor ;
that means - LU is self- biased ,same as dreky triode /pentode , whatever ........

point is - you have 1K in drain of input Jfet ; 1K is adequate value - as load for that Jfet , and also adequate regarding AC amplitude across it for LU's gate modulation ;

you can't put there every bloody value you can imagine

CCS , bellow that 1K resistor is there , to achieve 0V DC across 1K resistor ..... in common words - to RELOAD it - DC wise .......

edit - here at my place is p[retty late ....... so - it's completely possible that I made some drek in that schematic ............

and - it can be simpler at least 75% ( without mirrors - just CCS bellow -25V )...... but - without testing I can't say that simpler should be better

 

[carpenter]

are you sure that you don't have some Serbian ancestors ?

sometimes you're same as fast & stubborn as serb

My ancestors originated from Holland......

 

[Zen Mod]

My ancestors originated from Holland......

hehe

that xplains everything ......... you and Jaccovitty will eat my liver .......

 

[carpenter]

hehe

that xplains everything ......... you and Jaccovitty will eat my liver .......

Only with onions and lots of garlic!!!!!!!!!

 

[carpenter]

With Choky's instructions

 

[Zen Mod]

With Choky's instructions

almost fast as Pony Express !

make that R1 - pot of 47E

edit :

now - because of better tempco - replace both CCS-es ( Q3 and Q10) with two bjt CCS (look at Bab schm)

 

[carpenter]

Thanks Choky. I'll play with the latest ideas tonight.

You're a peach!

 

[carpenter]

Here's a start:

 

[Zen Mod]

Here's a start:

now replace Q10 CCS with two bjt CCS ; look at schmtc for inspiration



/point is that two bjt CCS have much better tempco than variant with one bjt /

 

[carpenter]

You're so sweet to me......

 

[carpenter]

Am I in the ballpark?