7
The Earth / Grounding Concept
General GROUND-LIFT Jumper (accessible from the inside.
Mind the SECURITY INSTRUCTIONS !! ):
Ex-works this jumper is set to the
GND/GROUND
position.
The internal ground potential - normally connected to the external earth
reference at this point - may be lifted by means of this jumper.
As a result, the interconnection for DC voltages and lower frequencies
(< 150 Hz) will be cut. Higher frequencies will be bled off to earth
potential through the RC filter. The LIFT position may be helpful in case
of hum or jitter caused by different ground/earth potentials.
VIOLECTRIC HPA V100/200 GROUND CONCEPT / BLOCK CIRCUIT
G(round)
G(round)
L(ift)
L(ift)
C(ase)
C(ase)
10
0n
10
0
n
1
2
3
1
2
3
XLR female
XLR female
Ground Lift Jumper:
Ground Lift Jumper:
GND
Earth / PE to Case
Lift
10
0
n
10
k
Toroidal Transformer
230 / 115 V AC
POWER SUPPLY
+ U
18/30 V
- U
18/30 V
(others)
E
A
C
I
N
GENERAL GROUND-LIFT JUMPER
AC IN
LEFT BALANCED INPUT
LEFT UNBALANCED
INPUT CINCH
RIGHT BALANCED INPUT
V
O
LU
ME
POWER AMP
TIP
LEFT
RING
RIGHT
SLEEVE
GROUND
ENCLOSURE
RIGHT UNBALANCED
INPUT CINCH
L
E
N
AC Mains
Socket
