I'm devoted.
Kind of self serving , I NEED wattage. NO issue with the output , especially if I get some...
I'll trade the output for some help. I will output my full 12 years of audiophile experience in
exchange for help. My output will reflect the next level beyond the Wolverine. A more diverse
audio ecosystem is gonna be launched.
OS
Kind of self serving , I NEED wattage. NO issue with the output , especially if I get some...
I'll trade the output for some help. I will output my full 12 years of audiophile experience in
exchange for help. My output will reflect the next level beyond the Wolverine. A more diverse
audio ecosystem is gonna be launched.
OS
hi OS.
post 143 picture..., C7 connect to D5,
not the same with schematic and simulation from post 1
post 143 picture..., C7 connect to D5,
not the same with schematic and simulation from post 1
I got it ! Updated the first post Spooky schema. PCB was right , schema had C6 -7 swapped. Thanks !
I also forgot the supply cap labels and the VAS led labels. I will also update the artwork.
I will add a ZIP file of the choice parts I used - PDF's in zip file.
1. FMBM5551/5401 SOT-6 cascodes.
2. BC807/817 dual SOT-6 LTP's
3. 2SC3649-SA1419 TO-243 SMD for VAS.
Look those packages over well , it was hard to route Q3,4,5,6 + Q7,8,9,10 !!!
OS
Can't see it on the PCB but on the schematics you decided finally to attach the servo reference to Glift instead of G1 ?
Since this servo is incapable of hugely DC'ing the amp and is not affecting either LTP input , I might make the choice of servo reference an option
on both boards.
I just did a new one (SYMASUI 2023) that don't need a servo. 5ppm is nice for the Wolverine front end plus a new symmetrical VAS .
Something different resurrected from the Slewmaster days (8 years ago).
OS
Attachments
All is referenced to lifted ground on the PCB. The first post zip is corrected. Also added all 3 simulations on a zip.
I'm tired !!
OS
I'm tired !!
OS
One more test , (below) .... the Symasui self clamps with no saturation at clip . 5ppm is nice , but I want "bombproof".
A tiny bit of sticking with the minimum of ringing when the the semi clamps. Does not have the Wolverine issue ,
does not need any diode in the VAS. Cascode LED's would flash on this one , too ! Easy to implement clip detection.
Matched SMD mirrors, LTP's . and cascodes should make for a snappy amp !!
A tiny bit of sticking with the minimum of ringing when the the semi clamps. Does not have the Wolverine issue ,
does not need any diode in the VAS. Cascode LED's would flash on this one , too ! Easy to implement clip detection.
Matched SMD mirrors, LTP's . and cascodes should make for a snappy amp !!
Attachments
2 -pole is the way ! (below)
.2ppm Vin plus .5ppm Vout is .3ppm 20khz.
lower levels = 0 ??
Added a back-end VAS cascode for more balance. Hmmm , this amp does not have mega LF OLG but what it does have
extends out to 100K ! different bode response than my other designs.
PS - I even changed semi's (BCxxx) and loaded down to 3R , still <1ppm ... cool.
OS
.2ppm Vin plus .5ppm Vout is .3ppm 20khz.
lower levels = 0 ??
Added a back-end VAS cascode for more balance. Hmmm , this amp does not have mega LF OLG but what it does have
extends out to 100K ! different bode response than my other designs.
PS - I even changed semi's (BCxxx) and loaded down to 3R , still <1ppm ... cool.
OS
Attachments
F the "Wolverine".
Pushing two pole to the edge , with lots of margin.
I get 75db gain at 20Khz vs. 61db on the wolverine.
- I still retained just 2 stages , "Catharsis" 3- stage amp gets 80-90db-20Khz , who cares.
-Simple , 1 VAS cascode ... which now also is smoothed by the backend of the single 2Q CCS - NO ground reference. PSRR should be stellar.
Ohhh ! it is above 1K , just drops out of site. Avoiding ground has it's advantages.
Yup - 4 BC807/817 SSOT duals , and 2 FMBM5401 duals SSOT , 3 single SOT23. No servo. 20 resistors. simple but powerful.
You could classify this as a Wolverine with a superior VAS = 12-15db more OLG @ 20Khz. I'll also be using better parts !!
OS
Pushing two pole to the edge , with lots of margin.
I get 75db gain at 20Khz vs. 61db on the wolverine.
- I still retained just 2 stages , "Catharsis" 3- stage amp gets 80-90db-20Khz , who cares.
-Simple , 1 VAS cascode ... which now also is smoothed by the backend of the single 2Q CCS - NO ground reference. PSRR should be stellar.
Ohhh ! it is above 1K , just drops out of site. Avoiding ground has it's advantages.
Yup - 4 BC807/817 SSOT duals , and 2 FMBM5401 duals SSOT , 3 single SOT23. No servo. 20 resistors. simple but powerful.
You could classify this as a Wolverine with a superior VAS = 12-15db more OLG @ 20Khz. I'll also be using better parts !!
OS
Attachments
Wow , I can get 80+ db 20Khz and .2ppm , Wolverine on steroids.
I must thank the "catharsis" poster for triggering me to resurrect this topology.
I'm floored by a design that LT shows as NO distortion ... WTF !
Is it a glitch ? Wolverine performed as simulated , even better ?
It has to be the extreme native balance of the base circuit. this one , you
are DIRECTLY listening to the primary LTP. It is so connected to the VAS - unreal.
VAS currents are nanoamp difference- a perfect VAS ,no distortion. Without a 3'rd stage.
Modern semi's can do 50k gain with just 2 stages.
Sick THD , level 3 !!
OS
I must thank the "catharsis" poster for triggering me to resurrect this topology.
I'm floored by a design that LT shows as NO distortion ... WTF !
Is it a glitch ? Wolverine performed as simulated , even better ?
It has to be the extreme native balance of the base circuit. this one , you
are DIRECTLY listening to the primary LTP. It is so connected to the VAS - unreal.
VAS currents are nanoamp difference- a perfect VAS ,no distortion. Without a 3'rd stage.
Modern semi's can do 50k gain with just 2 stages.
Sick THD , level 3 !!
OS
Attachments
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Speaking for smd Spooky.We need some advice like smd resistors,caps case style and type.
Is it someone working on a Mouser bom?
Is it someone working on a Mouser bom?
1/2W =1206 1/8w = 0805 . caps 0603 or bigger , I made monster pads for 22uF ones.
OS
Thanks Pete,but i can't see resistors watt range at the schematic diagram.🤔
Does it mean that R21,R26=1/2W and all other resistors are 1/8W?
Does it mean that R21,R26=1/2W and all other resistors are 1/8W?
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I'm going to further embellish the IPS schematics with the next update. Yes , 21/26 hellraiser , 24/29 spook , and 14/15/16/18 on Symasui. (below)
You will see the much larger 1206 pads for them.
You built the V1.0 Symasui , can't believe I did not add the current mirror - totally different beast now.
Symasui 2.0 will be both through-hole and SMD - 2 versions. It's that good !
OS
Attachments
Thanks . It thinks it's symmetrical.
I'm surprised it beat the wolverine.
Such a low part count.
I'm surprised it beat the wolverine.
Such a low part count.