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3

FRONT PANEL CONTROLS

POWER REQUIREMENTS

retroaktiv 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 

Summary of Contents for HLFO

Page 1: ...hlfo UTILITY MODULATION SOURCE OPERATION MANUAL ...

Page 2: ... the amplitude of the LFO With a plug inserted 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 inverted NOISE This output provides a noise source The...

Page 3: ... 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...

Page 4: ...MPER 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 FAST SLOW MIN RATE C3 C12 C16 C17 C25 C26 C27 C28 C29 C30 C31 C32 C33 D2 D6 D8 D...

Page 5: ... speed range settings When the FAST jumper setting is selected the minimum speed is about 25Hz and the maximum speed is 125Hz With SLOW setting 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...

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