DUAL LINEAR VCA - Blacet Research
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1. DUAL LINEAR VCA BLACET RESEARCH MODEL VCA2410 Linear VCA User Manual DUAL LIN VCA BLACET 2410 Blacet Research 15210 Orchard Rd Guerneville CA 95446 blacet blacet com http www blacet com 707 869 9164 Contents Copyright 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 1 Introduction The VCA2410 is a dual linear response voltage controlled amplifier VCA Both VCAs may be used independently or together to process audio or control voltages The two CV inputs are normalled to an internal voltage source so that the VCAs can be used in mixer mode without any external CV When a patch cord is plugged into a CV jack the internal CV is bypassed Normalling also routes the A input to the B input and the B output to the A output The Controls and Operation section will show why this is a handy feature One control knob is available for each VCA Note that they may yield the same results but that each one has a distinct function The upper control attenuates the input signal while the lower control attenuates the CV This allows added flexibility in use DUAL LIN VCA A Signal Attenuator A B Signal Input I2. N AN Also sent to B if In B is not connected O A Control Voltage MAI TBn G OUT A B A B Signal Output FA Includes B Signal if Out B is not connected B CV Attenuator B Signal Input B Control Voltage B Signal Output BLACET 2410 Page 2 Controls and Operation IN A B OUT A B CV A SIG ATTN Pot The 2410 has two VCA sections A signal applied to In A B will appear at Out A B The signal level will be determined by the setting of the Sig Attn signal attenuation pot and the level of any external control voltage input at CV A With no plug present at the CV A jack an internal 10V source is connected to the circuit allowing 100 output The control voltage range is 0 10V with a linear response A level of 0 volts results in no output a level of 5V allows an output of 50 of the input assuming the Sig Attn pot is FCW and 10V results in 100 output There is no gain associated with the VCA IN B OUT B CV B CV ATTN Pot The second section of the 2410 operates in a similar manner except for the presence of jack normalling If nothing is plugged into In B then the In A B signal will be connected internally to the B VCA This allows splitter and panner functions without external multiples If nothing is plugged into Out B then the Out B signal will be summed interna
3. lly with the A signal and appear at the Out A B jack This allows mixer and VC fader functions without an external mixer The diagrams below illustrate some typical configurations For VC stereo panning use the Splitter configuration with a source of normal 0 10V and inverted CVs 10 0V such as the Blacet EG1 connected to the CV ins For a VC fader use the Mixer configuration and a CV source as in the Splitter mode Splitter Mixer Independent VCAs IN OUT a noO oaoa Q noO IN OUT O n CV O Power Input Connector J7 This PCB connector requires a source of regulated 15Vdc and 15Vdc power to run the module Use a Blacet PS500 supply or the equivalent Connections to J7 should be made only when the power supply is OFF and the connector must be positioned correctly on the pins As using the wrong supply can cause damage to the unit please contact us if you have any questions Do not attempt to use wall warts to power the module Safety Information The use of any audio equipment requires some care to avoid potential damage to the hearing of the operator or their audience Even short term exposure to high audio levels can lead to temporary hearing loss and ringing in the ears Repeated exposure can eventually lead to permanent hearing problems Your ears have to last you all your life take a few precautions to keep them happy so that you can enjoy music even when you are older e When using mid to high vol
4. ume levels be aware that the ear will loose sensitivity at some point causing you to turn up the volume to compensate In an extended session this can happen repeatedly until the volume is quite high and potentially dangerous e Break up sessions into half hour segments avoid all night jams e Take breaks often and choose a maximum volume setting for mandatory breaks e Try using very very low volumes as a break e Music can sound quite different at low levels use low volumes for initial setup and routine practice saving high levels for final mixes e If your music starts to sound painful it s most likely causing hearing damage as well Page 3 Specifications Front Panel Size 5 25 x 1 5 W Module Depth 3 2 Input Gain 1X max CV Range 0 10V Frequency Range DC to 20 KHz Signal Level typ 10V p p Max 26V p p Power 15 Vdc 35 35 mA 1 2 3 4 5 6 7 ELETE ETI S ETTE ETET ETTE EELE EEEE EEEE EEE Calibration Calibration is not required Troubleshooting Repair Warranty 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 We can then help you get your module working We can fix modules for a minimum fee of 25 The parts contained in this unit have been carefully selected and tested They are guaranteed for 90 days from the date of purchase If you believe that you have a defecti
5. ve part or if you have a part missing contact us so we can provide you with a replacement or repair Include your name and invoice number Page 4
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