quad vca basic manual
Contents
1. Channel D has 10X gain To make this 1X replace R8 with a 100K 5 resistor Page 5 Page2. 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 Page 4 Specifications Front Panel Size 5 25 x 3 W Module Depth 6 Input Output Jacks 3 5 mm 1 8 Amplitude Voltage Control exponential 100mV dB Frequency Range 0 to 20 KHz CV Range 0 10V Output Level 13 5V max Power 15 Vdc 29 29 mA Calibration Place the Bias front panel pot in the center detent position Set RT1 to read 10 0V at TP1 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 defective part or if you have a part missing contact us so we can provide you with a replacement or repair Options The normal control voltage range of the VCAs is 0 10V This can be changed to 0 5V by doing the following o Change RA R17 18 19 20 to 66 5K four places a Cut the RB traces solder side of PCB and install four 100K 1 resistors standing up o Change R11 to 49 9K a Change R7 to 82K a Adjust RT1 for 5 0V See Calibration
3. letely separate we could also do a three input mixer with a master VCA controlled by an ADSR A IN CV ABC D OUT DIN BIN OD OUT CV CIN CV Page 3 Another use for VCA D takes advantage of it s 10X gain External signals from keyboards etc can be brought up to modular synth levels for use with the Final Filtre Time Machine Mini Wave etc Stereo panning is easy to do with the addition of the Blacet EG1 VC ADSR module since it has an inverted output available Use a multiple or splitter cord to run the audio to the two inputs You can use A B or C for the left output ABC D OUT Audio In ABC D OUT Audio In D OUT O B O Since there are uncommitted VCAs in both fading and panning extra processing can be added as required CV mixing The 2200 is DC coupled so that control voltages can be mixed as well as audio signals You will probably find that using the 75 dB setting of the toggle switch to be the most useful for this application CV Range The 2200 is set up for 0 10V CV Negative CVs will have no effect 75dB 100dB Switch Try using 75dB for mixing CVs and 75dB or 100dB for audio signals Power Input Jack J11 A source of regulated 15Vdc power must be supplied to this PCB jack to run the module Note the current requirements in the Specifications section Connections to this jack should be made only when the power supply is OFF and the connector must be positioned correctly on
4. luding straight mixing VC mixing stereo panning fading distortion and external signal amplification VCa QUaD Mix Input A MIX Mix Level A Input B Mix Level B Attenuation Range Input C Mix Level C Input D Mix Level D Up to 10X Gain Mix Output D normalled unless plug is inserted in D Mixer Bias Out Center 1 1 Gain D Output CW from center overdrive CV Inputs A thru D Inserting plug overrides normalled Bias CV BLACET RESEARCH 2200 Page 2 Controls and Operation A voltage controlled amplifier is a pretty simple thing VCA IN de OUT CV Actually the amplifier bit is a misnomer because you don t really amplify anything You typically get out only what you put in unity gain at maximum control voltage The 2200 does have one channel with a 10X gain stage preceding the VCA So a better name for this device is Voltage Controlled Attenuator still a VCA Here s what the 2200 looks like inside A IN CV BIN O ABC D OUT CV CIN CV DIN O D OUT The arrows indicate the normalled connections The Mix pot on each input is not shown With no external CV we have a three or four input mixer with the Bias pot acting as the master volume or distortion control Add external CV to any input as needed Since D can be comp
5. vCa BLACET RESEARCH MODEL VCA2200 Quad Voltage Controlled Amplifier Mixer Module User Manual VCa D guan mix D MIX MIX cv c CV D BLACET RESEARCH 2200 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 VCA2200 is a versatile quad voltage controlled amplifier module with an exponential response curve A high quality SSM2164 quad VCA IC is used in this unit for lowest noise and distortion The module is set up as a four input mixer with a VCA on each input A Bias pot normals a CV to each VCA unless a plug is inserted into the CV input for that channel The mid position of the Bias pot has a detent which is calibrated for unity gain through the VCAs with the Mix pots turned fully CW Channel D has 10X gain Channels A B and C are connected to the ABC D Output with Channel D being normalled unless a plug is inserted into the D Out Channel D can thus be used as a separate VCA It also has up to 10X gain for use with low level signals This VCA is suitable for a variety of tasks inc
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