Tremolo


Posted on Oct 19, 2012

The VCO of Ul, a phased-locked loop. produces a low-frequency square-wave signal from 5 Hz to 2500Hz, which is controlled by varying the voltage to pin 9 via R2. The frequency threshold is set by Rl and Cl. Increasing the value of Rl increases the frequency, and decreasing the value of Cl decreases the threshold frequency. Transistor Ql is operated as an amplifier with the Q point at 4 V, using a transistor with a voltage gain (beta) of 100.


Tremolo
Click here to download the full size of the above Circuit.

The gain without tremolo is about 2 V. With bypass capacitor C4 in the circuit, the gain is set at 33 dB. The instrument drive cannot be greater than 30 mV with C4 in the circuit (no tremolo), to avoid distortion. Without C4, the drive can be 1.5 V maximum with no distortion. Ul"s output is coupled to the collector of transistor Ql via depth control R4. The square-wave signal pulls the audio at a frequency determined by R2. The oscillator is activated by foot switch Sl.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Overvoltage protection circuit
    cmos 4047 power inverter 12vdc
    the design of the intellectual wireless signal transducer of ARM
    Computer Microphone Circuit
    digital sine wave synthesis
    project DBS
    simple headlight reminders
    Msp430c112 Irda Sir Encoder/decoder
    Power Amplifiers
    The STA013 MP3 Decoder Chip
    TDA2030 8w Amplifier



    Top