Glensound GSVX4 User manual

ELECTRONICS LTD
G
G
LEN
SOU
ND
GSVX4
ULTRA PORTABLE
3 CHANNEL MIXER
HANDBOOK & USER GUIDE
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE. ENGLAND. TEL: [phone]
Visit our Website at www.glensound.co.uk [phone]
FAX: [phone]

GLENSOUND ELECTRONICS LTD
GSVX4 3 Channel Portable Mixer HANDBOOK CONTENTS
DATE 23/01/03 ISSUE No. 1
DESCRIPTION DRAWING No.
1. Front & Rear Views A2-14708
2. Block Diagram A4-14706
3. GSR34 Channel Circuit Diagram A2-14764
4. GSR34 PPM Circuit Diagram A3-14765
5. GSR34 Parts List (2 pages) WP29-101
6. GSR35 PSU Circuit Diagram A4-14766
7. GSR35 Parts List WP29-102
8. Specifications (3 Pages) WP24-56
9. User Guide (4 Pages)
GGLENSOUND ELECTRONICS LTD. Tel: [phone]
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND [phone]
www.glensound.co.uk email: [email protected] Fax: [phone]

GLENSOUND ELECTRONICS LTD
GSR34 Main PCB for GSVX4 PARTS LIST
DATE 23/01/03 ISSUE No. 1
PART NUMBER MANUFACTURER OR
SUPPLIER Value or Part No. NOTES
IC1,3&5 Texas Instruments INA217
IC2,4,6&13 Texas Instruments TLO74
IC9,10,11&12 National Semiconductor LM339
IC14 Motorola MC33178
T1&2 Zetex ZTX550
SW1-6 APEM 25149NH DPDT centre off
RV1-3 ALPS RK09D Series 10k Lin
RV4 100k Lin
FADER1-3 Penny & Giles PGF3020/D/M..XA
TZ1-10 AVX Transguard 14V
D1-4 Any 1N4148
ZD1 Any BZX55 3V9
C1,4,5,8,9&12 Any 22/16v Radial Electrolytic
C2,3,6,7,10&11 BG Components 100N 5% 63V 222 470 series
C19 Any 10/16v Radial Electrolytic
C17,18,20,21&22 Any 22/16v Radial Electrolytic
C13-16 NITAI 4u7/35V Non Polar Electrolytic
R1,15&29 Any 10k 1% Metal Film
R2,16&30 Any 33 ohms 1% Metal Film
R3,17&31 Any 2k7 1% Metal Film
R4,5,18,19,32&33 Any 1k 1% Metal Film
R6,20&34 Any 15k 1% Metal Film
R7,21&35 Any 6k8 1% Metal Film
R8,22&36 Any 100k 1% Metal Film
R9,23&37 Any 1k8 1% Metal Film
R10,24&38 Any 3k9 1% Metal Film
R11,25,39&65 Any 10k 1% Metal Film
GSR34 PARTS LIST Page 1
GGLENSOUND ELECTRONICS LTD. Tel: [phone]
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND [phone]
www.glensound.co.uk email: [email protected] Fax: [phone]

GLENSOUND ELECTRONICS LTD
GSR34 PARTS LIST Page 2
GGLENSOUND ELECTRONICS LTD. Tel: [phone]
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND [phone]
R40,41&46 Any 10k 1% Metal Film
R42 Any 390k 1% Metal Film
R43&44 Any 180k 1% Metal Film
R45 Any 220 ohm 1% Metal Film
R47 Any 2k 1% Metal Film
R48 Any 1k5 1% Metal Film
R49 Any 1k2 1% Metal Film
R50 Any 1k 1% Metal Film
R51 Any 750 ohms 1% Metal Film
R52 Any 620 ohms 1% Metal Film
R53 Any 470 ohms 1% Metal Film
R54 Any 390 ohms 1% Metal Film
R55 Any 300 ohms 1% Metal Film
R56 Any 240 ohms 1% Metal Film
R57 Any 200 ohms 1% Metal Film
R58 Any 150 ohms 1% Metal Film
R59 Any 120 ohms 1% Metal Film
R60 Any 470 ohms 1% Metal Film
R61 Any 22k 1% Metal Film
R62&63 Any 820 ohms 1% Metal Film
R66 Any 330 ohms 1% Metal Film
R67 Any 3k3 1% Metal Film
R68 Any 1k8 1% Metal Film
R69 Any 3k9 1% Metal Film
R70 Any 10k 1% Metal Film
www.glensound.co.uk email: [email protected] Fax: [phone]

GLENSOUND ELECTRONICS LTD
GSR35 PSU PCB for GSVX4 PARTS LIST
DATE 23/01/03 ISSUE No. 1
PART
NUMBER MANUFACTURER OR SUPPLIER VALUE NOTES
IC1 National Semiconductors LM317T
IC2 Linear Technology LT1308B Surface Mount
IC3 Arizona Microchip PIC12C508 Programed
IC4 National Semiconductors 78L05
L1,3&4 RS Comps 240-618 47uH
L2 RS Comps 240-595 10uH
C1,2&3 Any 22/16v Radial Electrolytic
C4& 6-11 Any 100/16 HF Radial Electrolytic
C5 Any 100pf Disc Ceramic
D1&8 International Recifier 1N4002 Diode
D2-7 International Rectifier 11DQ03 Schottky Diode
R1 Any 220 ohms 1% Metal Film
R2 Any 680 ohms 1% Metal Film
R3 Any 1K 1% Metal Film
R4 Any 47K 1% Metal Film
R5 Any 1M 1% Metal Film
R6 Any 110K 1% Metal Film
TZ1 5V Transzorb
GGLENSOUND ELECTRONICS LTD. Tel: [phone]
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND [phone]
www.glensound.co.uk email: [email protected] Fax: [phone]

GGLENSOUND TECHNICAL SPECIFICATIONS
3 CHANNEL OB MIXER TYPE GSVX4
GGLENSOUND ELECTRONICS LTD Jan 24 2003
File MW24-56
Issue 2
TECHNICAL SPECIFICATIONS OF
GSVX4 ULTRA PORTABLE
3 CHANNEL O.B. MIXER
INPUT CHANNELS
3 off Electronically Balanced
ALL are mic / line selectable
ALL have selectable LF Roll off at 80Hz and 160Hz
Input Connectors are 3 pin female XLR
MAIN OUTPUT CHANNELS
2 off Similar Electronically Balanced outputs
Output Connectors are 3 pin male XLR
HEADPHONE OUTPUT CHANNEL
1 off headphone output with level control
Headphone Connector is jack socket
INPUT LEVELS
MIKE INPUT
-70 to –30 dBu with gain control.
LINE INPUT
-30 to +10 dBu with gain control
OUTPUT LEVELS
Normal Output : 0 dBu
Maximum Output : 16 dBu
File MW24-56 Page No. 1

GGLENSOUND TECHNICAL SPECIFICATIONS
3 CHANNEL OB MIXER TYPE GSVX4
INPUT IMPEDENCES
Mike Channel > 2K Ohms
Line Channel >= 10K Ohms
OUTPUT IMPEDENCE
<= 50 Ohms
FREQUENCY RESPONSE
+/- 2.0 dBu 50 Hz to 20 kHz
TOTAL HARMONIC DISTORTION
At normal output level for 1 kHz with all settings at normal position
<=0.3%
At maximum output level 50 Hz – 20 kHz
<=0.5%
HEAD ROOM
Head room at normal settings at fader points
>10 dB
SIGNAL TO NOISE RATIO
MICROPHONES
Equivalent input noise > -120 dBu
LINE
Normal input & output levels >= 70 dB
CROSS TALK
Inter channel cross talk at normal level at 1 kHz >55 dB
FADE OUT ATTENUATION
At extreme faded out position > 75 dB
FADER TYPE
65 mm Penny & Giles sealed conductive faders rated at > 50,000
operations free off scratch noise.
File MW24-56 Page No. 2

GGLENSOUND TECHNICAL SPECIFICATIONS
3 CHANNEL OB MIXER TYPE GSVX4
PPM
14 LED PPM for indication of output level.
POWER INDICATOR
A front panel LED indicating power on, flashes when batteries are low.
POWER SUPPLY
External 9 to 18 volt DC supply
Internal Battery compartment for 3 x D cells
Battery life @ 20 oC > 8 Hours
External AC PSU supplied
CLIMATIC CONDITIONS
Normal operating temperature range –5 to +50 oC, 10 to 80% humidity
WEIGHT
< 3 Kg excluding batteries & carrying case
GUARANTEE
1 year return to base
File MW24-56 Page No. 3

GLENSOUND ELECTRONICS LTD
GSVX4 3 Channel Ultra Portable Mixer USER GUIDE
DATE 24/01/03 1 of 4 PAGES ISSUE No. 1
The GSVX4 is an ultra portable battery
operated 3 channel mixer. It is built in a strong
aluminium frame, which is designed to
withstand the demands of everyday use in an
outside broadcast environment. It utilises the
World famous Penny & Giles faders and is
supplied with a soft and ergonomic carrying
case. The mixer functions are designed to be
simple to use yet offer the facilities required by
broadcast professionals.
POWER.
The GSVX4 will operate for more than 8 hours from batteries, but can also be connected to an
external power supply (a mains power supply is included with the unit).
Installing Batteries: 3 off Alkaline D cells should be used.
The battery compartment lid is located on the front panel and is removed by
turning approximately a quarter turn to the left and then pulling out away
from the mixer. It is important only to insert the batteries with the negative
(flat) side of the battery first, the positive (slightly raised) end of the battery
when installed should point to the battery compartments lid. If the GSVX4 is
not used for a period of more than a few weeks then it should have the
batteries removed before storing.
Connecting External Supply:
The external DC in connector is located on the rear panel. The centre pin of
the connector is positive. The GSVX4 will operate from 9 volts to 18 volts
Turning On: A 3 position toggle switch is located on the rear panel. The centre postion is
off and if in this position the GSVX4 will not operate. Point this switch to
EXT for the mixer to operate from an external power supply. Point this
switch to INTERNAL BATTERY for the mixer to operate from the internal
batteries.
If the GSVX4 is switched to the internal battery and if an external power
supply is connected then the mixer will power from the external power
source and automatically switch to the internal batteries if the external power
source fails or is turned off.
GGLENSOUND ELECTRONICS LTD. Tel: [phone]
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND [phone]
www.glensound.co.uk email: [email protected] Fax: [phone]

GLENSOUND ELECTRONICS LTD
GSVX4 3 Channel Ultra Portable Mixer USER GUIDE
DATE 24/01/03 2 of 4 PAGES ISSUE No. 1
GGLENSOUND ELECTRONICS LTD. Tel: [phone]
Power on LED: A power on green LED is located on the top panel. This is illuminated when
the GSVX4 is turned on. If this LED starts to flash then the batteries should
be replaced. When the LED starts to flash there is approximately a further 30
minutes of operating time left in the batteries.
CONNECTING AUDIO INPUTS
The GSVX4 is a 3 channel mixer. Each channel has it’s own 3 pin XLR socket as an input
connector. These sockets are located on the rear panel and are marked CH1, CH2 and CH3, they
correspond to the mixer controls marked CH1, CH2 and CH3.
Wiring: The input XLRs are connected to an electronically balanced input and are
wired:
PIN 1: Ground
PIN 2: In Phase
PIN 3: Mate
If connecting to non professional unbalanced equipment (ie domestic mini
disc or cassette player) then PIN 1 should NOT be connected, PIN 2 should
connect to the signal and PIN 3 should be connected to the Ground.
Microphone Impedences:
The circuitry is optimised to connect to professional dynamic microphones
with an impedence of 200 Ohms. It will work with microphones with
impedences between 10 and 600 Ohms.
CHANNEL OPERATION
All 3 audio input channels of the GSVX4 are the same as each other and the following
information applies to each.
MIC/ LINE Switch:This switch is located at the top (nearest the rear panel) of each channel.
When in the LINE position the channel is optimised for connecting to 0 dB
source such as a professional mini disc. The LINE position should also be
used when connecting to non professional ‘line’ level equipment such as
cassette machines or radio tuners.
This switch should be switched to the MIC (+40dB) position when
connecting a microphone to the channel.
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND [phone]
www.glensound.co.uk email: [email protected] Fax: [phone]

GLENSOUND ELECTRONICS LTD
GSVX4 3 Channel Ultra Portable Mixer USER GUIDE
DATE 24/01/03 3 of 4 PAGES ISSUE No. 1
GGLENSOUND ELECTRONICS LTD. Tel: [phone]
COURSE GAIN Pot:
This is the rotary potentiometer immediately below the MIC/LINE switch.
The scale around the pot is meant for an approximate guide and is in dB.
When turned fully clockwise the level of the channel is increased by 30dB.
When turned fully anticlockwise the gain of the channel is reduced by 10dB.
‘Nominal Settings’ The following are an approximate guide:
If a professional mini disc is connected then turn the pot to 0.
If a non professional cassette recorder is connected then turn the pot to +10.
If a microphone is connected then turn the pot to +20.
LF CUT SWITCH (Low Frequency):
This is the 3 position switch below the course gain pot. It affects how much
low frequency audio is allowed to pass through the mixer. In the centre
FLAT position it does not affect the low frequencies. In the left 80 position
any audio below 80Hz is reduced by passing through a 12dB per octave
filter. In the right 160 position any audio below 160Hz is reduced by passing
through a 12dB per octave filter.
FADER: This is the channels audio level adjustment that affects how much audio from
that particular channel ends up in ‘mix’ (output) and can also be used for
‘fine’ gain of the audio level. The printed scale to the right of the fader is in
dB, is approximate and meant as a guide. In it’s closed position (furthest
away from the LF switch) no audio will pass through the channel to the mix
output. The further open the fader is (the closer to the LF cut switch) the
more audio that will go to the mix output. The average position to set the
fader is marked on the scale as 0, when used in this postion an extra 10dB of
gain is available by opening the fader fully and if needed the level can be
reduced by slightly closing the fader.
PPM OUTPUT LEVEL METER
This is the 14 LED column on the top panel. It provides a visual indication of the level of audio
at the outputs of the mixer. It has a Peak Program Meter (PPM) characteristic. Each LED covers
a 2dB range. Zero dB (the normal line up level) is marked on the scale to the left of the LEDs at
4 (or the first of the yellow LEDs). The normal program level that should go to the output is
+8dB (or the first red LED).
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND [phone]
www.glensound.co.uk email: [email protected] Fax: [phone]

GLENSOUND ELECTRONICS LTD
GSVX4 3 Channel Ultra Portable Mixer USER GUIDE
DATE 24/01/03 4 of 4 PAGES ISSUE No. 1
GGLENSOUND ELECTRONICS LTD. Tel: [phone]
OUTPUTS
The GSVX4 has 2 outputs. These are 3 pin XLR plugs on the rear panel. They are marked O/P1
and O/P2. Each output is connected internally to it’s own electronic output amplifier, each of
these output amplifiers are fed from the same point in the mixer and they therefore the same.
Wiring: The output XLRs are 3 pin plugs and are wired:
PIN 1: Ground
PIN 2: In Phase
PIN 3: Mate
REAR
VIEW
OF GSVX4
HEADPHONES
The headphone connector is a 6.5mm stereo jack socket suitable for A or B gauge jack plugs. It
is located on the front panel.
Wiring: It is wired to produce a mono output on stereo headphones, ie tip and ring are
internally connected.
Impedence: It is optimised for use with professional headphones of impedences between
200 and 2000 Ohms.
Level Control: The audio level of the headphones is controlled by the HP VOL control pot
which is located on the top panel. The minimum level is when this pot is
turned fully anticlockwise and the maximum level is when it is turned fully
clockwise.
6 BROOKS PLACE, MAIDSTONE, KENT, ME14 1HE, ENGLAND [phone]
www.glensound.co.uk email: [email protected] Fax: [phone]