KAB PS-1200GXEFFICIENT DC POWER CONDITIONER |
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SPECIFICATIONS
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The 1200 original power supply has very little reservoir capacitance, 470 uF. The bulk of the supply filtering is performed by the DC regulator, doubling as a capacitance multiplier. These circuits are common, but they are not optimum. By incorporating a choke input, large reservoir capacitor and dynamic shunt noise filter, the DC leading into the 1200 is now a clean source of power. This lets the internal regulator do a better job of regulating the motor load. Also, since the internal power transformer, is deactivated, an additional source of EMI and mechanical vibration is eliminated. The turntable plays quieter. The PS-1200GX uses no transformers of any kind, eliminating all sources of low frequency EMF. The kind that can cause audible hum. |
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GREAT FEATURES
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To gain international approvals, I wanted to
use a high quality switching power supply as the front end of the new design.
Switchers are economical, fully certified and very light weight. So with that
part solved, the real work was to come, developing the DC power conditioner.
The challenge is, how do you produce a practically noise free source of DC and
keep the series voltage drop to below 0.25V? The solution comes in 2 parts.
Choke input with large capacitor resevoir and a dynamic shunt active
filter. Since the PS-1200GX is external and no transformers of any kind are used, all original sources of mechanical vibration and low frequency EMF are eliminated. The 'table plays quieter. Sonically this enhances low level resolution and intertransient silence. The SENSE line detects the original power
switch in the turntable. This way you turn the PS1200GX on and off just by
using the original power switch. |
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INFO | |
| MORE 1200 PARTS | ||
KAB ELECTRO ACOUSTICS
P.O.BOX
2922
PLAINFIELD, NJ 07062, USA
PHONE 908-754-1479
FAX
908-222-3442