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Blacet Research VCO2100, User & Assembly Manual

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Blacet Research VCO2100 User & Assembly Manual Download Page 10

Page 10

We reserve the right  to void  the warranty or  refuse to  service any  module that  has been built  with parts  not supplied  by us, 
modified in any way, subjected to abuse, or damaged beyond repair. 

Assembly Documents

• Parts list  
• Schematic 
• PCB phantom view  

Summary of Contents for VCO2100

Page 1: ...tp www blacet com 541 947 5330 Contents Copyright Rev 2 2014 Reproduction by any means including the Internet prohibited without permission This document contains proprietary and trade secret information of Blacet Research and is provided as a service to the module owner Any unauthorized duplication or transferral may violate trade secret laws Contents subject to change without notice ...

Page 2: ...o the FM input which can be switched to a linear or exponential response and AC or DC coupling This input has an attenuator The sync input can be used with a pulse wave to have oscillators lock together when they are close in frequency The Octave input allows precision switching up one octave with a CV 2 5V or down one octave with a CV 2 5V An on board tune button connects to the octave circuitry ...

Page 3: ...Linear switch setting will result in less frequency shifting of the VCO The amount of FM is controlled by the Level pot The FM input can be directly DC or capacitively AC coupled VC Wave CV input VC Wave Output Wave Pot At minimum CV in or with the Wave pot turned FCCW the VC Wave output is a triangle wave With increasing CV or pot rotation the wave will assume a more squarish shape The wave modul...

Page 4: ...ontrol exponential 1V Oct Frequency Range 30S to 60 KHz Waveforms Sine Triangle Sawtooth pos ramp Pulse VC Wave CV Range Frequency PWM OCT 5V VC Wave 0 10V Output Level 5V nominal Power 15 Vdc 55 55 mA Circuit Description The VCO2100 is basically a device for generating audio waveforms in response to an analog voltage level What makes this task somewhat challenging is the industry requirement that...

Page 5: ...1 supplies 5 00V which is scaled and inverted by two sections of U3 to provide stable reference voltages of 10V and 10V U3 is a TL054 op amp which has low offset and good temperature stability These voltages are further scaled and inverted to provide 1 00V and 1 00V These voltages are used to switch octaves The Oct input J2 drives a dual comparator circuit based on two sections of op amp U5 This s...

Page 6: ...really somewhat old fashioned and flux removal can involve harmful chemicals We build our boards with the 331 and 245 products and cannot guarantee results with rosin core solders You will also need a lead bender needle nose pliers side cutters and a nut driver set or pliers A DMM will be necessary for checking voltages PCB Assembly Use 331 solder Resistors Insert all the resistors bending the leg...

Page 7: ...o the board and have no tilt from front to back When everything looks perfect solder the other pins Capacitors Cap There are several different types You may need a magnifier to read the code on the small ceramics Note that the electrolytic type must be properly oriented Insert the side which has the longer lead closest to the on the silkscreen The opposite side of the capacitor should have a row o...

Page 8: ... so that the bracket is square with the edge of the PCB ICs Install the ICs now as they will be less accessable once the PCBs are mounted to the front panel Make sure all the legs are straight and are actually going into the socket before seating the IC Observe correct orientation Use a static free work station or wrist strap when installing the ICs Front Panel Work on a soft surface such as a tow...

Page 9: ...d connection no cold joints check for a blob of solder causing a short check all component locations and polarities and check for the possibility of a broken trace or a hairline short caused by under etching of the PCB especially around the pots If you encounter problems that you can t solve contact us preferably via e mail with a description of the problem Let us know what does and does not work ...

Page 10: ...ght to void the warranty or refuse to service any module that has been built with parts not supplied by us modified in any way subjected to abuse or damaged beyond repair Assembly Documents Parts list Schematic PCB phantom view ...

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