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Old 29th January 2014, 02:03 PM   #21
lhquam is offline lhquam  United States
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In post #1, I forgot to list the Impasse Preamplifier ImPasse Preamplifier as a suitable F4 gain stage. I have built the Impasse and it sounds very good.
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Old 29th January 2014, 02:21 PM   #22
Zen Mod is offline Zen Mod  Serbia
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you can edit #1
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Old 29th January 2014, 02:39 PM   #23
lhquam is offline lhquam  United States
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you can edit #1
Thanks ZM. Is there a way to move the schematics from post #10 to posts #1 and #2 respectively?
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Old 29th January 2014, 02:41 PM   #24
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you can edit #1
(we'll have to start callin you MrZ)
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Old 29th January 2014, 02:47 PM   #25
juma is offline juma  Germany
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Originally Posted by lhquam View Post
... I need do look more carefully at the end-to-end square wave response to see if your use of an RC snubber might be useful.
I doubt it - I used it as a precaution because my prototypes were very messy, but nevertheless stable...
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Old 29th January 2014, 03:13 PM   #26
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by lhquam View Post
Thanks ZM. Is there a way to move the schematics from post #10 to posts #1 and #2 respectively?
you can put whatever you want in #1 , but for later ones - just use report button in particular post

that way Mods will read it , eventually
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Old 29th January 2014, 06:39 PM   #27
NYCOne is offline NYCOne  United States
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I could be missing it, but these seems little difference between the Curly and the LSK preamp. For the less well versed of us, can someone point out what the real differences are?
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Old 29th January 2014, 06:49 PM   #28
lhquam is offline lhquam  United States
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I could be missing it, but these seems little difference between the Curly and the LSK preamp. For the less well versed of us, can someone point out what the real differences are?
The topology is identical (without the output buffer). The difference is only in the choice of operating voltages, currents, and resistor selection. What I am reporting is the actual integration into an F4 and its end-to-end performance.
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Old 29th January 2014, 08:29 PM   #29
juma is offline juma  Germany
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... actual integration into an F4 and its end-to-end performance.
And you did great. Preamp like this is what the F4 is actually made for. It's easy to get higher voltage rails (needed for the preamp) from F4's transformer so the integration is easy and straightforward and the basic idea (high linearity, no feedback loop) is well preserved. Well done !
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Old 29th January 2014, 09:22 PM   #30
lhquam is offline lhquam  United States
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\ ... It's easy to get higher voltage rails (needed for the preamp) from F4's transformer so the integration is easy and straightforward ... !
Thanks for the complements. Are proposing a voltage doubler using the F4 transformer? I hadn't considered that, but given that less than 50mA is required from each higher voltage rail, that should be easy. I just used a Hammond 229B88 transformer which has a pair of 44V secondaries.
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