I'm building another Infidel IPS. Using the schematic from post #5753. I installed everything just like the schematic. I guess that makes it option #2. Will that work for +-74V rails?
Thanks, Terry
Thanks, Terry
I'm building another Infidel IPS. Using the schematic from post #5753. I installed everything just like the schematic. I guess that makes it option #2. Will that work for +-74V rails?
Thanks, Terry
Thanks, Terry
Yes, the current on the infidel is set by fixed resistors. The default schema is
my standard +/- 75V simulation.
Included are the 40V values noted to "get the picture across" (or for testing - my test
PS is 40-0-40).
Hey , Terry ... put this one in the freezer/fridge and bring up to room temp. 😀
Bet it beats the spook or wolverine 5.0 > 5.3ma (0C > 25C)
OS
Phase Margin = 83
Gain Margin = 20
Slew Rate = 72V/uS
THD: 70W/8Ohm, 1kHz -> 0.001998%
THD: 70W/8Ohm, 20kHz -> 0.004837%
PSRR 1kHz -> 110
Output double emitter follower, PSU +-45V.
"simitri"
Symetri = spooky without the cascode loss and a little less THD than the hawksford.
it does saturate a little (same as the hawksford).
Not as "rounded" as the super-pair overload wise.
I just added the symetri VAS to the "spook" - adjusted currents.
(below) ... works perfect. 🙂
This might be my future "hungry sub" IPS.
PS - there was a member from Chile that actually built one of these -
forgot his name .... was in the "supersym" thread.
Edit - I got 8 ppm 20K (100W) !!
OS
Symetri = spooky without the cascode loss and a little less THD than the hawksford.
it does saturate a little (same as the hawksford).
Not as "rounded" as the super-pair overload wise.
I just added the symetri VAS to the "spook" - adjusted currents.
(below) ... works perfect. 🙂
This might be my future "hungry sub" IPS.
PS - there was a member from Chile that actually built one of these -
forgot his name .... was in the "supersym" thread.
Edit - I got 8 ppm 20K (100W) !!
OS
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Excellent VFA
And a simple one , too.
-NO servo (ccs adj.1-2 can control offset)
- Bimo's VAS offsets the omission of cascodes 😎
- only 2 volt wasted rail voltage , good for subs.
- A 10 transistor "wonder" @ .001% THD20k - 100w /6R.
-thermally ... VAS offsets input pairs - nearly perfectly.
Should not scare the first time " oh, there is too many transistors" crowd ! 😀
edit - "downside" - VAS is X2 the I (front pair and back pair @ 5.3ma - 10.6ma)
This VAS will need a small heatsink.
OS
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Yes , I will feed your addiction .. Terry 😀 .
I am now at the layout stage for 2 IPS's - "BSIPS" and "Symetri."
I'll do both at once.
Either two "back to back" (- connected to -) 470u @ 10- 25V or the "standard" 220u @35V bipolar.
ALL the dc- blocker based IPS' s are set for the latter. Use the former in a "pinch".
OS
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