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SylphAudio New DIY Modules

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#61
Sylphaudio OPA1612 Preamp / Buffer Performance

Setup:
Input Source = SMSL DL200 @4.96Vrms
Power Supply = LRS-350-36 @38V DC
SMSL 4.96v.PNG


Output from SylphAudio Pre/Buff module
preamp.PNG


SMSL DL200 overlaid with SylphAudio Pre/Buff output
overlay.PNG
 
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#63
SylphAudio said:
For FB100 and FB360, removing the 22uF electro cap before the LM7812 reg going to TPA325x improves the sound. Verified 5W/4R FFT and 7812 output on scope and it's the same before and after. Same 22uF caps on ADJ of 317/337 regs can be removed without affecting the SINAD performance. Perfect warm neutral sound if those 3 caps were removed.

View attachment 1421055
Click to expand...
Have you now changed these modules in this way or is this just a modification that you recommend be made to your boards?
 
#64
Studley said:
So what are the differences please?
Click to expand...
FB360 has a slightly perceivable micro detail, although it can only be noticed when you compared them side by side.
Studley said:
Have you now changed these modules in this way or is this just a modification that you recommend be made to your boards?
Click to expand...
Removing the bulk electro cap on the input pin of LM7812 powering the TPA chip has a difference in sound. So yes, we removed it going forward. Power supply on the TPA325x chip affects the sound the most, I think.

317/337 adj caps for the opamps, we retained it since it doesn't have much difference on my subsequent listening tests.
 
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