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Time Event Modulator
VC DADSR
BLACET RESEARCH MODEL EG3870
User & Assembly Manual
Blacet Research 94502 Stock Drive Lane, Lakeview, OR 97630
blacet@blacet.com http://www.blacet.com
541-947-5330
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.
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Table of Contents
Summary of Contents for Blacet Research Time Event Modulator EG3870
- Page 1 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.
- Page 2 Introduction The Blacet EG3870 Time Event Modulator is a CV controlled DADSR with attenuverter CV inputs to allow a flexible combination of internal or external signals to dynamically control the ADSR segments. The Delay section allows 0 to 10 seconds of delay before the envelope starts. A wide variety of outputs include Full and Inverted envelopes as well as an attenuated envelope.
- Page 3 Operation Notes The EG3870 uses the inverted envelope as the default cv source for modulation. Since this is occurring at the same rate as the regular envelope, the effect will be to bias each ADSR segment from the standard RC curve to one that is more linear or even bent the opposite direction.
- Page 4 Circuit Description Schematic Sheet 2 shows the CV input section which consists of a buffer, U1c and an attenuator pot R1. An external Global CV is input here. Or, with no external signal the Inverted Envelope is normalled to the jack switch. This Global CV is normalled to the four cvs controlling Attack, Decay, Sustain and Release.
- Page 5 solder flows through the plated through holes. The usual method for replacing a part on a double sided board involves cutting all the legs of the component and desoldering the pins one at a time, using a solder sucker. This minimizes possible board damage due to excess heat.
- Page 6 Resistor Color Codes Tolerance (gold = 5%, brown = 1%) Multiplier (# of 0ʼs) 3rd digit (only on 1% resistors) 2nd digit 1st digit Black = 0 Brown = 1 For example: green (5), blue (6), orange (3 zeros), gold Red = 2 (5%)= a 56000 or 56K ohm, 5% tolerance resistor.
- Page 7 Pots: Starting with the -2 PCB, Insert the four detent style pots (R2-R5) on the pcb (these have a notch at the center of the revolution) Note that R1 is not a detent style. Solder one mounting leg on each pot. Holding the PCB with one hand, remelt each solder joint and press the pot down onto the PCB.
- Page 8 Testing Connect a +/-15 V bipolar regulated power supply (such as the PS505 or PS800) to the board. Make sure that the connector is properly positioned on the header. Do not make the power connection to the board with the power supply turned on.
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