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    McBennett VCF - R27 Rev

    Uploaded by

    AdrianoEngel
    This document provides a circuit diagram for a voltage-controlled filter (VCF) with an attack/decay generator. The circuit uses operational amplifiers, capacitors, and resistors to generate a control voltage signal. An LDR and white LED are shrink wrapped together to sense light and control the attack and decay times of the VCF. The circuit allows the filter to be triggered via an external input or automatically via the LFO generator.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    McBennett VCF - R27 Rev

    Uploaded by

    AdrianoEngel
    137 views1 page
    This document provides a circuit diagram for a voltage-controlled filter (VCF) with an attack/decay generator. The circuit uses operational amplifiers, capacitors, and resistors to generate a control voltage signal. An LDR and white LED are shrink wrapped together to sense light and control the attack and decay times of the VCF. The circuit allows the filter to be triggered via an external input or automatically via the LFO generator.

    Original Description:

    VCF synth com lm358

    Original Title

    McBennett VCF - R27 rev

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    © © All Rights Reserved

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    This document provides a circuit diagram for a voltage-controlled filter (VCF) with an attack/decay generator. The circuit uses operational amplifiers, capacitors, and resistors to generate a control voltage signal. An LDR and white LED are shrink wrapped together to sense light and control the attack and decay times of the VCF. The circuit allows the filter to be triggered via an external input or automatically via the LFO generator.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    137 views1 page

    McBennett VCF - R27 Rev

    Uploaded by

    AdrianoEngel
    This document provides a circuit diagram for a voltage-controlled filter (VCF) with an attack/decay generator. The circuit uses operational amplifiers, capacitors, and resistors to generate a control voltage signal. An LDR and white LED are shrink wrapped together to sense light and control the attack and decay times of the VCF. The circuit allows the filter to be triggered via an external input or automatically via the LFO generator.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    Pete McBennett LDR VCF with Vcc = 9 volts

    Attack/Decay Generator
    R21 & R22 ARE LDR AND WHITE LED
    SHRINK WRAPPED FACING
    TOGETHER,
    LDR IS JAMECO 202382

    R21
    R16 R17
    C6 33K 1M
    R18
    4.7uF
    47K CW
    J2 Vcc
    R13
    RESONANCE R19
    22K
    10K
    C4 Vcc
    AUDIO Vcc Vcc R14
    INPUT .001uF
    100K
    2N3904 Q2 R9

    U4 Pin8 Pin7 Pin6 Pin5 U3 Pin8 Pin7 Pin6 Pin5 R15 10K
    R22 100K
    LM358 R12 LM358
    FILTER 22K FILTER R10
    18K
    Pin1 Pin2 Pin3 Pin4 Pin1 Pin2 Pin3 Pin4
    C7
    AUDIO
    OUTPUT 4.7uF R20
    CW R11
    J1 10K
    100K
    C5
    .001uF CUTOFF

    VCF CONTROL VOLTAGE

    Vcc Vcc R8

    R7
    1M
    1M

    U2 Pin8 Pin7 Pin6 Pin5


    U1 R5 AND R6
    Pin8 Pin7 Pin6 Pin5 BUFFER
    PREFERABLY Vcc
    C2 LOGARITHMIC
    R1 LM358
    470uF 555 TIMER
    10K
    ATTACK / DECAY ATTACK DECAY LFO
    GENERATOR Pin1 Pin2 Pin3 Pin4
    Pin1 Pin2 Pin3 Pin4 R5 R6 R25
    CW CW
    500K 1M 100K
    R3
    D1 100 R26
    100K
    1N4148
    C1 Q1 D2
    2N3904 C3
    1N4148 R4 10uF R27 R24
    0.1uF R2 100 10K 100K
    10K

    R23 CW
    AUTO 100K
    TRIGGER
    S1 C8
    SPEED 4.7uF

    EXTERNAL
    TRIGGER

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