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Oakley Sound Systems

5U Oakley Modular Series

The SVF issue 5

Voltage Controlled State Variable Filter

Builder's Guide

V5.3

Tony Allgood
Oakley Sound Systems
CARLISLE
United Kingdom

Summary of Contents for Modular Series

Page 1: ...Oakley Sound Systems 5U Oakley Modular Series The SVF issue 5 Voltage Controlled State Variable Filter Builder s Guide V5 3 Tony Allgood Oakley Sound Systems CARLISLE United Kingdom...

Page 2: ...ice on connecting the unit and calibration procedures please visit the main project webpage at http www oakleysound com svf htm For general information regarding where to get parts and suggested part...

Page 3: ...for each rail Power is routed onto the PCB by a four way 0 156 MTA156 type connector or the special five way Synthesizers com MTA100 header You could of course wire up the board by soldering on wires...

Page 4: ...tors Failure to use low tolerance parts in these locations will mean your filter will be unlikely to oscillate over the full audio range in the HIGH setting I have suggested using 2 5 or better tolera...

Page 5: ...anofarad To prevent loss of the small as the decimal point a convention of inserting the unit in its place is used eg 4R7 is a 4 7 ohm 4K7 is a 4700 ohm resistor 6n8 is a 6 8 nF capacitor Resistors Al...

Page 6: ...6 6V2 500mW zener diode D5 BC550 NPN transistor Q2 BC560 PNP transistor Q1 Integrated Circuits LM13700 dual OTA U1 TL072 dual op amp U2 U3 U4 U5 U6 Trimmers 100K 6mm trimmer OFF1 OFF2 100K multiturn t...

Page 7: ...if using optional Sock8 board Molex MTA 0 1 header 6 way UPR Molex MTA 0 1 header 8 way LWR Molex MTA 0 1 housing 6 way UPR Molex MTA 0 1 housing 8 way LWR 112APC Switchcraft 1 4 socket SK1 SK2 SK3 S...

Page 8: ...together You will need to connect your switch so that the lower two lugs of the switch are connected to the SAT pads on the board This can be done with either insulated multistrand wire or solid core...

Page 9: ...ns Synthesizers com The PWR power socket is to be fitted if you are using the module with a Synthesizers com system In this case you should not fit the PSU header The PWR header is a six way 0 1 MTA b...

Page 10: ...which is six way and LWR for lower which is eight way Both headers are fitted to the bottom side of the board If you have an issue 2 Sock8 board Don t forget to fit a wire link in position L1 You nee...

Page 11: ...iece of insulated wire can then be used to connect those connected earth tags to pin 1 of LWR Pin 1 is the square solder pad All the other connections are connected to the signal lugs of the sockets T...

Page 12: ...nother piece of solid core wire going across horizontally to connect all four vertical wires together Take a single insulated piece of wire back to on the PCB and connect it to pin 1 of the header LOW...

Page 13: ...signal to the appropriate header on the PCB The pots wires will attach to the underside of the board at each header and thus be soldered from the topside of the board For each header pin 1 is connect...

Page 14: ...requency pot to above the mid point first to actually get the SVF to start to oscillate it does not tend to oscillate naturally at frequencies below 1kHz or so Beware it is quite possible to get this...

Page 15: ...ost faults can be found and fixed within one hour and I normally return modules within a week The minimum charge is 25GBP plus return postage costs If you have a comment about this builder s guide or...

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