CVGT1 User Manual Rev 1.2
Contents
1. Electronic Music cannot be held responsible for any damage or harm caused through incorrect or unsafe use of this module If in doubt stop and check If you are still unsure of what to do then please contact Synovatron for advice before proceeding Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual CVGT1 Description The CVGT1 Module has four channels two for CV signal translation and two for timing signal translation as follows Banana to Euro CV Translation Channel This is a precision DC coupled amplifier designed to translate input signals in the range of OV to 10V to an output compatible with the 10V bipolar range of Eurorack synthesizers CV in A 4mm banana socket input with a range of OV to 10V Buchla compatible CV out A 3 5mm jack socket output Eurorack compatible scale This switch allows the gain to be changed to match the scale factor of the CV In input signal This can be set to deal with 1V octave 1 2V octave and 2V octave scales in the 7 position the amplifier has a gain of 1 unity in the 7 2 position it has a gain of 1 1 2 or 0 833 and in the 2 position it has a gain of 1 2 or 0 5 scale offset This switch adds an input offset voltage f to the input signal of either OV or 5V In the position no offset is added so a positive going input signal e g envelope will allow the output signal to remain positive going i e OV to2. BuA average EN 55022 2010 Class B Conducted RF 0 5 30MHz 30dBuA quasi peak EN 55022 2010 Class B Conducted RF 0 5 30MHz 20dBuA average a Immunity EN 61000 6 1 2007 Enclosure port Module front panel EN 61000 4 3 2006 A2 2010 RF EM field 80 1000MHz 3V m 80 AM 1kHz EN 61000 4 2 2009 ESD Contact discharge 4kV Air discharge 8kV Date CE Mark first applied 24 08 2012 Signed cl Tony Steventon Managing Director Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012
3. CVGT1 User Manual User Manual Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual Synov Electronic Music Introduction Thank you for purchasing the Synovatron CVGT1 Module This manual explains what the CVGT1 Module is and how it works Note This manual refers to CVGT1 modules with a serial number of 101 or higher surface mounted component version refer to User Manual Rev 1 1 for lower serial numbers belonging to the early production through hole component version The CVGT1 Module is an 8HP 40mm wide Eurorack analogue synthesizer module and is compatible with the Doepfer A 100 modular synthesizer bus standard CVGT1 Control Voltage Gate Trigger module 1 is a CV and Gate Trigger interface primarily aimed at providing a means of exchanging CV and timing pulse control signals between Eurorack synthesizer modules and Buchla 200e Series although it will also work with other banana socketed synths such as Serge and Bugbrand Caution Please ensure you use the CVGT1 Module in accordance with these instructions especially taking great care to connect the ribbon cable to the module and the power bus correctly Always double check Only fit and remove modules with the rack power off and A disconnected from the mains electricity supply for your own safety Refer to the connection section for ribbon cable connection instructions Synovatron
4. V the level of V will only be affected by the scale switch The simplified schematics a to f explain in simple arithmetic terms how an input signal in the range of OV to 10V is translated using the various offset and scale switch positions Schematics a to c show the offset switch in the position for each of the three scale positions Schematics d to f show the offset switch in the position for each of the three scale positions Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual offset scale 1 a OV 10V PE OV 10V OV offset scale F LE b OV 10V OV 8 333V 2 V offset scale 2 c OV 10V gt OV 5V offset scale 1 d OV 10V PE 5V 5V 5V offset scale 1 2 e OV 10V 4 167V 4 167V 5V offset scale 2 f OV 10V gt 2 5V 2 5V 5V Note that when the scale switch is in the 1 position and the offset Be switch is in the position as shown in schematic a the signal is not Z changed This is useful for interfacing banana connector synthesizers that have 1V octave scaling e g Bugbrand to Eurorack synthesizers Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual Euro to Banana CV Translation Channel This is a precision DC coupled amplifier designed to translate bipolar input signals from Eurorack s
5. al initiates the timer The pulse duration 0 5ms to 5ms is set by a trimmer e Pulse output The gate and trigger initiated signals are OR ed together using diodes This allows other modules with diode connected outputs to also be OR d with this signal Output indication Red LED is on for the duration of pulse out Please note that Synovatron reserves the right to change the specification without notice General Dimensions 3U x 8HP 128 5mm x 40 3mm PCB depth 33mm 46mm at ribbon connector Power consumption 12V 20mA max 12V 10mA max 5V is not used A 100 Bus utilisation 12V and OV only 5V CV and Gate are not used Contents CVGT1 Module 200mm 10 to 16 way ribbon cable 2 sets of M3 cap head socket screws nylon washers and a 2 5mm hex key Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual Environmental RoHS All components used on the CVGT1 Module are RoHS compliant To comply with the WEEE Directive please do not discard into landfill please recycle all Waste Electrical and Electronic Equipment responsibly please contact Synovatron to return the CVGT1 Module for disposal if required Warranty The CVGT1 Module is guaranteed against defective parts and workmanship for 12 months from date of purchase Note that any physical or electrical damage due to misuse or incorrect connection invalidates the warranty A low cost repair service will be availa
6. ble for any repairs outside of warranty conditions Quality The CVGT1 Module is a high quality professional analogue device that was lovingly and carefully designed built tested in the United Kingdom by Synovatron Electronic Music Please be assured of my commitment to providing good reliable and usable equipment Any suggestions for improvements will be gratefully received Thank you and happy music making Tony Contact details Tony Steventon Synovatron Electronic Music 104 Twyford Avenue Portsmouth PO2 8D UK M 44 0 7889 053435 T 44 0 2392 669339 E Synovatron btinternet com W http synovatron blogspot com Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual BE d E Synov Electronic Music EC DECLARATION OF CONFORMITY Synovatron Limited T A Synovatron Electronic Music 104 Twyford Avenue Portsmouth PO2 8DJ UK T 02392 669339 M 07889 053435 E synovatron btinternet com W http synovatron blogspot com Product Description CVGT1 Module hereby declare that this product conforms to the essential requirements of the Electromagnetic Compatibility EMC Directive 2004 108 EC Harmonized EMC Standards applied Emissions EN 61000 6 3 2007 A1 2011 Signal amp control lines Jack inputs amp outputs EN 55022 2010 Class B Conducted RF 0 15 0 5MHz 40dBuA 30dBuA quasi peak EN 55022 2010 Class B Conducted RF 0 15 0 5MHz 30dBuA 20d
7. e CV out with a DMM and with no input applied to CV in record the value of the residual offset voltage reading 8 Apply 8 333V to CV in this should be checked with the DMM 9 Measure CV out with a DMM and adjust RV2 for 10 000V above the value recorded in step 7 I Note there is only one scale control for CV in channel and one for CV A in channel so the adjustments are optimised for a scale of 1 2 However due to the use of high precision components used the other scale positions will track the 1 2 setting to within 0 1 Similarly the offset reference voltage adjustment is shared between both channels Pulse timing adjustments The pulse timing adjustment pots are on the GT1 board The adjustments should be performed with the aid of a clock or repeating gate source an oscilloscope and a small screwdriver or trim tool The widths of the pulses produced at pulse out from gate in and trig in are factory set to a gate in leading pulse width of 4ms RV2 and trig in pulse width of 1ms RV1 These can however be set anywhere from 0 5ms to over 5ms RV2 RV1 Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual CVGT1 Specification Banana to Euro CV Channel Input 4mm banana socket CV in Input range 10V Input impedance 1MQ Bandwidth DC 19kHz 3db Gain 1 000 7 0 833 7 2 0 500 2 0 1 max Output 3 5mm jack CV out Output range 10V Output i
8. es although any signal exceeding 3 4V will cause this output to go high Refer to the example timing diagram below The LED illuminates when gate outis high trig out A 3 5mm jack socket Eurorack trigger output The output goes high 10V when the pulse in voltage is above 7 5V This is used to follow the initial trigger part of Buchla 225e and 222e module pulses although any signal exceeding 7 5V will cause this output to go high trig out Note that trig out does not shorten pulses it just transmits the high level pulses at the width presented to pulse in which are all narrow pulses on Buchla synth pulse outputs Refer to the example timing diagram on the next page Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual pulse in gate out trig out a b c d The timing diagram above shows four example pulse in input waveforms and the gate out and trig out responses The input switching thresholds for the gate and trigger level detectors are shown at 3 4V and 7 5V The first example a shows the pulse shape similar to that of a Buchla 225e and 222e module pulses an initial trigger pulse followed by a sustain level which is reflected in the gate out and trig out responses The other examples show that pulses are just passed through at 10V to gafe out and trig out if they exceed respective thresholds A signal that exceeds b
9. mpedance lt 10 Euro to Banana CV Channel Input 3 5mm jack CV in Input range 10V Input impedance 1MQ Bandwidth DC 19kHz 3db Gain 1 000 7 1 200 7 2 2 000 2 0 1 max Output 4mm banana socket CV out Output impedance lt 10 Output range 10V Output indication Red LED for negative outputs CV Banana to Euro Gate Trigger Channel Input 4mm banana socket pulse in Input impedance 82kO Input threshold 3 4V gate 7 5V trigger Gate output 3 5mm jack gate out Gate output level gate off OV gate on 10V Trigger output 3 5mm jack trig out Trigger output level trigger off OV trigger on 10V Output indication Red LED is on for duration of pulse in Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual Euro to Banana Gate Trigger Channel Gate input 3 5mm jack gate in Gate input impedance 94kQ Gate input threshold 3 4V Trigger input 3 5mm jack trig in Trigger input impedance 94kQ Trigger input threshold 3 4V Output 4mm banana socket pulse out Output level e Gate initiated gate off OV gate on 10V initially 0 5ms to 5ms falling to 5V for duration of gate in Only the leading edge of the gate in signal initiates the timer The pulse duration 0 5ms to 5ms is set by a trimmer factory set to 4ms e Trigger initiated trigger off OV trigger on 10V 0 5ms to 5ms initiated by trig in Only the leading edge of the frig in sign
10. nection Instructions Ribbon Cable The ribbon cable connection to the module 10 way should always have the red stripe at the bottom to line up with the RED STRIPE marking on the CVGT1 Board The same for the other end of the ribbon cable that connects to the modular synth rack s power connector 16 way The red stripe must always go to the pin 1 or 12V position Note that Gate CV and 5V pins are not used The 12V and 12V connections are diode protected on the CVGT1 module to prevent damage if reverse connected 3 lal x cl ee w seus AN seule etui a PA Wea ak BA St Synovatron 2012 GT1 Board Rev 2 AV 1 2q EE i KOE at 2 v 16 way cable connector pin out Bus board pin out RHB Gate RHE cv EHE 5v MHJ 12V BH ov G ov BH ov BH 12v Viewed from pins Red wire pin 1 Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual Br Adaptors If you want to use the CVGT1 Module but have an Analogue Systems rack especially the older type with no Doepfer style sockets then Synovatron has an adaptor specially designed for this please contact Synovatron for details Synovatron Doepfer Module to Analogue Systems Bus DM2ASB Adaptor Front Panel Fixings The CVGT1 Module comes with M3 cap head socket screws nylon washers and a 2 5mm hex key The cap head socket screws look great and are ve
11. oth thresholds will be present on both outputs Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual ES Euro to Banana Gate Trigger Translator Channel This is a timing signal converter designed to convert Eurorack gate and trigger signals into a timing pulse output compatible with a Buchla synthesizer modules pulse inputs trigin A 3 5mm jack socket trigger input from a Eurorack synthesizer This can be any signal that exceeds the input threshold of 3 4V It will generate a 10V narrow pulse trimmer adjustable in the range 0 5ms to 5ms factory set to 1ms at pulse out irrespective of the input pulse width gatein A 3 5mm jack socket gate input from a Eurorack synthesizer This can be any signal that exceeds the input threshold of 3 4V This input is specifically designed to create an output at pulse out that is compatible with Buchla 225e and 222e module pulses i e it will cause a tri state output pulse The gate in leading edge will generate a 10V narrow trigger pulse also trimmer adjustable in the range 0 5ms to 5ms factory set to 4ms at pulse out irrespective of the input pulse width It will also generate a 5V sustaining gate signal for the duration of the input pulse if it extends beyond the narrow trigger pulse This can be seen in example a in the timing diagram on the next page pulse out A 4mm banana socket output compatible with Buchla synthesizer
12. pulse inputs It outputs a composite an OR function of the signals derived from the trig in and gate in pulse generators The output has a diode in its path so it can simply be connected to other Buchla compatible pulses without signal contention The LED illuminates when pulse outis high Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual 10V gate in trig in pulse out The timing diagram above shows four examples of gate in and trig in input waveforms and the pulse out responses The input switching thresholds for the gate and trigger level detectors are shown at 3 4V The first example a shows how a Buchla 225e and 222e module compatible pulse is generated in response to a gate in signal an initial 4ms trigger pulse followed by a sustain level lasting the length of the gate in signal Example b shows what happens when the gafe in signal is short and just generates the initial 4ms trigger pulse without a sustaining level Example c shows what happens when the frig in signal is applied the output is a 1ms trigger pulse triggered off the leading edge of the frig in signal and ignores the remainder of the trig in signal duration Example d shows what happens when a combination of gate in and trig in signals are present Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual Bee Con
13. ry easy to fit using the supplied hex key the nylon washers help protect the front panel If you like the way they look and want to do the rest of your synth the same way then please contact Synovatron Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual BE Adjustments These adjustments should only be performed by a suitably qualified person CV scale and offset adjustments The offset voltage reference and scale adjustment pots are on the CV1 board These adjustments should be performed with the aid of an adjustable DC voltage source and a precision Digital Multi Meter DMM with a basic accuracy of better than 0 1 and small screwdriver or trim tool ren Eu ofs EJ se 714 Synovatron 2012 RV2 RV1 RV3 1 Set the front panel switches as follows CV in scale to 1 2 CV in offset to CV in scale to 1 2 CV in offset to 2 Measure CV out with a DMM and with no input applied to CV in record the value of the residual offset voltage reading 3 Apply 6 000V to CV in this should be checked with the DMM 4 Measure CV out with a DMM and adjust RV3 for a reading of 5 000V above the value recorded in step 2 5 Set CV in offset to Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual Mr 6 Measure CV out with a DMM and adjust RV1 for 833mV above the value recorded in step 2 7 Measur
14. ynovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual ES a OV 10V Po OV 10V OV scale offset 1 2 b OV 8 333V OV 10V OV scale offset 2 c OV 5V Po OV 10V OV scale offset 1 d 5V 5V Po OV 10V 5V scale offset 1 2 e 4 167V 4 167V OV 10V 5V scale offset 2 f 2 5V 2 5V OV 10V 5V Note that when the scale switch is in the 1 position and the offset switch is in the position as shown in schematic a the signal is not changed This is useful for interfacing Eurorack synthesizers to banana connector synthesizers that have 1V octave scaling e g Bugbrand Copyright 2012 Synovatron Limited All rights reserved Rev 1 2 December 2012 CVGT1 User Manual Banana to Euro Gate Trigger Translator Channel This is a timing signal converter designed specifically to convert the tri state timing pulse output from Buchla 225e and 222e synthesizer modules into Eurorack compatible gate and trigger signals It will work with any signal that exceeds the input thresholds of either the gate or trigger detectors as follows pulse in A 4mm banana socket input compatible with Buchla pulse outputs in the range of OV to 15V gate out A 3 5mm jack socket Eurorack gate output The output goes high 10V when the pulse in voltage is above 3 4V This is used to follow the gate or sustain part of Buchla 225e and 222e module puls
15. ynthesizers into a OV to 10V range CV in A 3 5mm jack socket input from a E offset Eurorack synthesizer CV out A 4mm banana socket output with an output range of OV to 10V Buchla compatible scale This switch allows the gain to be changed to match the scale factor of the synthesizer connected to CV out This can be set for 1V octave 1 2V octave and 2V octave scales in the 1 position the amplifier has a gain of 1 unity in the 1 2 position it has a gain of 1 2 and in the 2 position it has a gain of 2 gnd CV out offset This switch provides an output offset that is added to the scaled input signal of either OV or 5V In the position no offset is added so a positive going input signal e g envelope will keep the output positive going CV LED indicator lights if the output signal goes negative to warn that the signal is outside the useful range of a OV to 10V range synthesizer gnd This connector is used to provide a ground reference to a banana socketed synthesizer if required The simplified schematics a to f explain in simple arithmetic terms what input ranges are required to translate to an output range of OV to 10V using the various offset and scale switch positions Schematics a to c show the offset switch in the position for each of the three scale positions Schematics d to f show the offset switch in the position for each of the three scale positions Copyright 2012 S
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