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Deleted member 148505
Yes, you know where it's going to .Would be really interested to see if this enables ultra-low SINAD for future TPA325x amps where PFFB is maxed to the limit.
Still waiting for Victor's osc, probably a month before it arrives.
After the buffer/pre and 800W power amp (ETA January 2024), next on queue is maxed out TPA3251 PFFB, won't say ETA anymore since it might get jinxed lol. It should get higher than 105dB SINAD (present Sylph-D100 P02 is 102dB to 103dB)
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Fosi Audio reached to us and bought a 1pc Sylph-D400, actually courteous than just anonymously buy the module. They're probably testing it by now. 👌
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Or they are trying to copy your amplifier - maybe we will soon see a new model by Fosi Audio.They're probably testing it by now. 👌
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Deleted member 148505
Topping PA5-II Archimago measurements.
https://archimago.blogspot.com/2023/10/part-ii-topping-pa5-mk-ii-plus-pa5ii.html?lr=1&m=1
Not much of a difference with Sylph-D100, plus the D100 has a dominant 2nd harmonic.
https://archimago.blogspot.com/2023/10/part-ii-topping-pa5-mk-ii-plus-pa5ii.html?lr=1&m=1
Not much of a difference with Sylph-D100, plus the D100 has a dominant 2nd harmonic.
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Deleted member 148505
They will be releasing a monoblock soon based on this guy's post.Or they are trying to copy your amplifier - maybe we will soon see a new model by Fosi Audio.
If you are as good as gamerpaddy at reverse engineering, then you can copy any amp . I hope he tears down LA90 one day lol.
Fosi Audio PBTL Deep PFFB with 2 ohms stable capability and replaceable opamp socket will be a hit to mass consumers I think.
Yeah, but honestly, if we're just looking at 1 kHz performance any old TPA3251/TPA3255 will work, including TPA3255EVM and probably even the good old LM3886.Topping PA5-II Archimago measurements.
https://archimago.blogspot.com/2023/10/part-ii-topping-pa5-mk-ii-plus-pa5ii.html?lr=1&m=1
Not much of a difference with Sylph-D100, plus the D100 has a dominant 2nd harmonic.
It's the 5 kHz, 10 kHz, IMD, and multi-tone performance in the highest octave that are important.
EDIT: Also, it looks like 3rd harmonic dominant (followed closely by 9th), not 2nd, although none would be audible at that level.
This is looking like a fantastic product JLesterP 🙂 Would dip switches with several common gains be too expensive to implement? It'd be handy if the gain structure can be adjusted without removing the board for smt soldering. Great work in any case!0dB gain is the default. I added empty 0805 SMT pads (circled in yellow) so that the gain can be easily increased.
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Deleted member 148505
Thanks! Either the gain switches be placed on the bottom PCB which is more expensive due to double sided assembly, or the PCB area be enlarged to accommodate the resistors and DIP switches.This is looking like a fantastic product JLesterP 🙂 Would dip switches with several common gains be too expensive to implement?
For this preamp / buffer I think I will shelve this design for the meantime since I have focused on creating -120dB 50W class-ab amp instead, since the costs are not that far from each other.
I have sent the SE800 to the assembly, 1 month before it arrives.
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Yes, can imagine its more expensive. Swappable smt resistor for gain is not a problem really. It's certainly a product I'd be interested in if the prototype tests well. 😀Either the gain switches be placed on the bottom PCB which is more expensive due to double sided assembly, or the PCB area be enlarged to accommodate the resistors and DIP switches
Some more detailed indication, please.for the meantime since I have focused on creating -120dB 50W class-ab amp
Hello,
usually i use Sylph-400 with opamp by-passed by 2 in/out jumpers drived by preamp.
Today i soldered 2 wires beetween input connector and decoupling caps.
Can be it sounds worse?
I turned in starting situation and sound is better? May anyone tell me wy it sounds worse?
If i well understud, with the wire i bypassed 3 resistors in series to signal?
usually i use Sylph-400 with opamp by-passed by 2 in/out jumpers drived by preamp.
Today i soldered 2 wires beetween input connector and decoupling caps.
Can be it sounds worse?
I turned in starting situation and sound is better? May anyone tell me wy it sounds worse?
If i well understud, with the wire i bypassed 3 resistors in series to signal?
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Deleted member 148505
Yes, prototype showed promising resultsIt's certainly a product I'd be interested in if the prototype tests well. 😀
Can't give the details until I create the final module. Still in design / simulation phase, not an open design.Some more detailed indication, please.
Pricing around 323 USD per 140W/4R mono channel
Do you have a picture of the connection? What kind of worse sound? lower bass/highs or garbled sound?Hello,
usually i use Sylph-400 with opamp by-passed by 2 in/out jumpers drived by preamp.
Today i soldered 2 wires beetween input connector and decoupling caps.
Can be it sounds worse?
I turned in starting situation and sound is better? May anyone tell me wy it sounds worse?
If i well understud, with the wire i bypassed 3 resistors in series to signal?
D
Deleted member 148505
If I understand your bypass correctly, there is series resistance between the preamp and the input coupling caps if you bypass and place jumpers on the opamp socket. If you directly wire your preamp to the input coupling cap, the sound will be inferior. Why is the input saturating and what is the preamp that you are using?Sound seems to be affected by input saturation. The sound is not distorcted but it is noticeably worse than with wiring broken and jumpers between input/output pin of opamp.
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Deleted member 148505
Pre is a tube preamp. Audioresearch Ls-22 clone.If I understand your bypass correctly, there is series resistance between the preamp and the input coupling caps if you bypass and place jumpers on the opamp socket. If you directly wire your preamp to the input coupling cap, the sound will be inferior. Why is the input saturating and what is the preamp that you are using?
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Deleted member 148505
I see, maybe the series resistance helps in preventing overloading of the inputs as the analog input_x of TPA325x only accepts 7Vpp (14Vpp for differential input).Pre is a tube preamp. Audioresearch Ls-22 clone.
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Deleted member 148505
I've created my own wires for that purpose. You only need a 24V to 38V DC power brick. Although at our place, dust will accumulate quickly if the module is left on free air.Oh boy, that FB100 is looking delectable. Too bad I'm not really in a situation anymore to do casework myself now
No buffer board for next year then ? 🙁😆 It's OK, I know you need to prioritise.SylphAudio Products for 2024
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Deleted member 148505
Yes got no unlimited funds for prototyping . I'll send it for manufacturing after the FBUltra* LM3886 amp, I'm aiming for -140dB distortion and lowest noise which will put it in the number 1 amplifier SINAD chart.No buffer board for next year then ? 🙁😆 It's OK, I know you need to prioritise.
On the buffer-preamp I will use either OPA1656 or OPA2156 on the frontend. So that a volume control can be placed before it without much noise penalty. Also, based on my listening experience, using the same opamp all throughout is not as good sounding as when using different opamps on different stages.
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