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© SPL electronics GmbH, Stand 04/97
Charisma
Charisma
Creating rough sounds,
Creating new harmonics,
Processing synth sounds.
C
HARISMA
can be used with extreme settings: For example, set
the D
RIVE
maximum and create richest Hammond organ sound.
Give clean guitars more bite or even softly distort them, or
make vocals rough and dirty.
You can run your favorite samples and synth sounds through
C
HARISMA
and give them the final edge. Give your TB 303 clone
the bite of the original 303. By widening the harmonical spec-
trum you have unlimited possibilities to boost and refreshen
synth sounds or create new ones.
Special care has gone into the design of the power supply of
the C
HARISMA
. The power supply is the heart of an electronic
system: The better it is, the better the whole system works and
– in an audio system – the better it sounds.
This power supply is based around a custom made 15VA
toroidal transformer and is designed to minimize induced hum
and noise due to the non existence of an air-gap. All required
voltages (230 V, 6.3 V and 2x15 V) have an individual wiring in
the transformer and are smoothened separately afterwords.
The primary voltage may be selected between 230 V/50 Hz
and 115 V/60 Hz by means of a recessed slide switch on the
rear panel.
The rear panel ground-lift switch may be used where ground
loops are causing hum problems. When the G
ND
L
IFT
switch is
set to off, the circuit ground is no longer connected to the chassis
ground. The power cord connector is a 3-wire, U-ground, stan-
dard IEC mains connector for a detachable power cord
(enclosed).
Transformer, power cord and mains connector have VDE, UL
and CSA approvals. The fuse has a value of 400 mA for the
primary voltage when operated at 230 V/50 Hz. At 115 V/
60 Hz the fuse value for the primary voltage is 800 mA.
On the secondary side of the power supply, an RC combina-
tion is used to filter out noise and hum voltages from the mains
side. Both half-waves are smoothed with 2000 µF capacitors in
the positive and negative voltage path. Both pathes use preci-
sion voltage regulators, as deviations of only a few millivolts
can result in audible changes such as a diffuse sound pattern.
The operational voltage of the tubes (250 V) is heavily smoo-
thened and electronically regulated. The heating voltage
(6.3 V) is supplied by an individuell wiring within the trans-
former. So-called “hum-trimmers” adjust the tubes´ heating
voltage and minimize the hum voltages.
All relays are operated via an individuell voltage regulator
and are therefore separated from the audio operating voltage.
Power Supply
Extreme Processing
Tip offs
