Posted on Mar 23, 2013

This simple circuit can color the sound coming from your audio system. Clocking for the circuit is provided by an oscillator built from one quarter of a 4093 quad NAND Schmitt trigger. With the component values shown, it will run at about 5 Hz. The clock frequency is fed to the gain control, pin 8, of an LM386 amplifier. Tremolo is produced by varying the amplifier gain. A trimmer potentiometer can be put in series with R1, to easily experiment with different rates. 1b experiment, make R1 about 100KO and use a 1-Mil trimmer.

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

That allows frequencies from about 2 to 20 Hz to pass. Resistor R2 is the depth control. It controls the degree of tremolo. To adjust, put a trimmer in series with R2. Make R2 a 5-KO unit and use a 50-KO trimmer. Since the tremolo clock uses the gain-control pin of the amplifier, change the value of capacitor C4 in order to change the gain of the amplifier. Make C4 larger to increase the gain or smaller to decrease it. But, don"t go any lower than 0.1 11F because you"ll be cutting into the bottom-end frequency response.

Leave Comment

characters left:

New Circuits



Popular Circuits

10 LEDS Audio level vumeter
Positive And Negative Voltage Power Supply
Sound-Activated Lamp (Relay/Switch)
op amp Op Amp based Colpitts oscillator
Car Boot Lamp Warning (ICM7556)
Weller WLC100 Electronic Soldering Station Circuit Q4012LPH
IC fluorescent dimming considerations
16x2 Alphanumeric LCD Interfacing :: AVR Tutorials
Oscillations and Regenerative Amplification using Negative Resistance
Multiplicative -DA converter electronic attenuator