Retroaktiv HLFO Manuale utente
hlfo
UTILITY MODULATION SOURCE
OPERATION MANUAL
2
FRONT PANEL CONTROLSretroaktiv hlfo
HLFO Users Manual
FRONT PANEL CONTROLS
RATE (Large Dial) - This ad-
justs the rate of the triangle
and square LFO.
RATE LED - Indicates the
rate of the triangle/square
LFO.
RATE (Trimmer) - This ad-
justs the RATE CV amount.
When no plug is inseed into
the RATE jack, this controls
the amount that the FSR
will control the rate of the
LFO. With a plug inseed,
this controls how much the
external CV affects the LFO
rate.
TRI/S&H/SQR - This switch
selects the output wave-
AMP (Large Dial) - This ad-
justs the output amplitude of
the LFO signal at the OUT jack.
AMP LED - Indicates the am-
plitude of the LFO OUT signal.
AMP (Trimmer) - This adjusts
the AMP CV amount. When no
plug is inseed into the AMP
jack, this controls the amount
that the FSR will control the
amplitude of the LFO. With
a plug inseed, this controls
how much the external CV
affects the LFO amplitude.
S&H - This is the output of
the internal sample & hold
circuit. The S&H signal can
be accessed here, even when
other output waveforms are
form of the HLFO. In the center position,
the Sample & Hold output will be routed
through the LFO VCA and inveed.
NOISE - This output provides a noise
source. The noise output is +5V to -5V.
SRC - Sample & Hold source input. The
internal sample and hold circuit is nor-
mally sampling the internal noise source
when nothing in plugged into the SRC
jack. Plugging into SRC will disconnect
the noise, and the external signal will be
used as the sample source.
selected at LFO OUT.
FSR - FSR Output. Pressing on the FSR
will generate a voltage from 0 to 5V,
based on how much force is being used
on the sensor pad.
CLK - Sample & hold clock. Use this input
to clock the S&H circuit. Incoming clocks
should be a square wave with an ampli-
tude of at least 3Vpp.
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FRONT PANEL CONTROLS POWER REQUIREMENTSretroaktiv hlfo
HLFO Users Manual
LFO
RATE CV
CLK
RATE
RATE
S&H
CLOCK IN
S&H IN
S&H OUT
NOISE
OUT
NOISE
SRC
TRI
S&H
SQR
VCA
AMP
AMP
OUT
FSR
FSR S&H
Figure 2 - HLFO Block Diagram
POWER REQUIREMENTS
HLFO is powered by +/- 12VDC and uses a 10 pin (2x5) IDC power cable. The +12V rail con-
sumes 24mA of current. The -12V rail consumes 8mA of current.
REAR PANEL CONNECTIONS
The HLFO module PCB contains additional inputs and outputs, allowing for bussing signals
between modules from the rear panel. This can be useful for normalizing modules in a rack, or
creating auxilliary inputs and outputs. J10 connections are as follows:
Pin 1 - Force sensor output (0 to 5V)
Pin 2 - CLK Out - (10V to -10V)
Pin 3 - Sample & hold output (-5V to +5V)
Pin 4 - LFO Output (Post VCA)
Pin 5 - External S&H source input (-10V to +10V) [Use jumper J11 to activate]
Pin 6 - Noise output
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REAR PANEL CONTROLSretroaktiv hlfo
HLFO Users Manual
<< FSR
CLK
<< S&H
<< LFO
S&H>>
<< NOISE
S&H SOURCE JMP
S&H EXT >>
INT >>
FAST
SLOW
MIN RATE
RANGE TRIM
C1
C2
C3
C6
C8
C10
C12
C16
C17
C18
C20
C21
C22
C23
C24
C25 C26
C27
C28
C29
C30
C31
C32
C33
D2
D5
D6 D8
D13
J10
J11
J12
Q3
Q4
Q5
Q10
R1
R2
R3
R4
R7
R8
R10
R11
R12
R16
R17 R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R32
R34
R35
R36
R37
R38
R40 R41
R42
R43
R44
R45 R46
R47R48 R49
R50 R51
R52
R53
R57
R59
R60
R61
R66
R67
R68
R69
U1
U3
U4
U5
U6
U7
U8
U9
U10
U11
Figure 3 - Aux Connections & S&H Source Jumper
S&H SOURCE JUMPER (J1) - The HLFO produces the default S&H waveform by sampling the
module’s internal noise source. The S&H input signal can be normalized to an external signal
instead. To do this, the external signal must be connected to J10, pin 5 (S&H EXT INPUT), and
J11, pins 2 & 3 must be jumpered. For normal operation, jump J11 pins 1 & 2.
<< FSR
CLK
<< S&H
<< LFO
S&H>>
<< NOISE
S&H SOURCE JMP
S&H EXT >>
INT >>
FAST
SLOW
MIN RATE
RANGE TRIM
C1
C2
C3
C6
C8
C10
C12
C16
C17
C18
C20
C21
C22
C23
C24
C25 C26
C27
C28
C29
C30
C31
C32
C33
D2
D5
D6 D8
D13
J10
J11
J12
Q3
Q4
Q5
Q10
R1
R2
R3
R4
R7
R8
R10
R11
R12
R16
R17 R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R32
R34
R35
R36
R37
R38
R40 R41
R42
R43
R44
R45 R46
R47R48 R49
R50 R51
R52
R53
R57
R59
R60
R61
R66
R67
R68
R69
U1
U3
U4
U5
U6
U7
U8
U9
U10
U11
Figure4 - Speed Range Jumper & MIN RATE Trim
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REAR PANEL CONTROLS REAR PANEL CONTROLSretroaktiv hlfo
HLFO Users Manual
SIGNAL LEVELS
NOISE output level - +5V to -5V
LFO TRI output level (max) - +3V to -3V
LFO SQR output level (max) - +5V to -5V
S&H output level (max) = S&H SRC input level (max)
CLK input - Threshold to trigger S&H is +5V. Input tolerant to +/-10V signals
SRC input - tolerant to +/-10V signals
FSR output - 0 to +5V
RATE CV - Input tolerant to +/-10V signals
AMP CV - Input tolerant to +/-10V signals
DIMENSIONS
Width = 10HP. Front panel = 128.5mm x 50.8mm. Depth = 22mm.
RATE RANGE JUMPER (J12) - The HLFO has 3 speed range seings. When the FAST jumper
seing is selected, the minimum speed is about .25Hz, and the maximum speed is 125Hz. With
SLOW seing selected, the minimum speed is about .025Hz (Period of about 45 seconds) and
the maximum speed is about 10Hz. If both FAST and SLOW are jumpered, the HLFO is capable
of periods of over 1 minute.
MIN RATE TRIM - The HLFO’s minimum rate can be dialed in using the MIN RATE trimmer. If
this trim is set to 0, the HLFO will full stop oscillating at the minimum RATE seing.
RANGE TRIM - The range trim should be set to minimum is most cases. If the maximum rate
is reached before the RATE pot is at its max, use the RANGE TRIM to stretch the useful range of
the RATE pot to its maximum.
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