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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Audio Electronics PS Regulator posted by ccd on July 27, 2000 at 05:24:59:
The Hafler SE100 preamp is a single-board design; there is virtualy
no external wiring. I had to think a bit, in order to minimize collateral damage when making this modification. If your power supply
is on a separate board, that may make installation easier.Installing the regulator required (carefully) cutting a trace and
drilling out two feedthroughs to isolate the line amplifier; I left
the headphone and tape buffer ICs connected to the original 78xx
regulators, which then required additional bypassing to cure some
self-oscillation (cutting the traces isolated them from the bypassing
physically located at the line amp stage).The new regulator board is sitting on standoffs hot-glued to the
main board; teflon wiring is connected to the appropriate points.
I also replaced the generic silicon rectifiers with Schottkys, added
RC snubbers across the Schottkys and the transformer secondary to
attenuate switching noise, and replaced all electrolytics with low-ESR
or Black Gates.How does if affect the sound? I dunno, I thought I heard an improvement in depth and imaging, but lacking an identical unmodified
unit to compare to, of course I can't say anything with certainty.
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Follow Ups
- Re: Audio Electronics PS Regulator - Damon W. Hill 11:24:48 07/27/00 (1)
- Re: Audio Electronics PS Regulator - ccd 13:16:51 07/27/00 (0)
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