Audio Circuits

 

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Audio Circuits


Metronome circuit with adjustable BPM

This metronome circuit with adjustable BPM, allows those persons who study or are music fans, to keep the timing, quite accurately for a long period of time.

6 LED VU meter using one transistor (circuit)

6-LED VU meter using one transistor

This simple 6-LED VU meter allows us to visualize the level of an audio signal. Due to its few components, it is a cheap circuit and easy to build. Components are very common and very easy to obtain.

Music Box Circuit using a CD4017 and two 555

Music box circuit using a CD4017 decade counter and two 555 timers.

This circuit attempts to emulate the operation of a music box. The maximum number of notes is 10, allowing us to make a simple melody.

8 LED VU meter circuit using LM324 IC

8 LED VU meter made of IC-LM324.

This circuit can be used to display the variation of an audio signal in a group of 8 LEDs, behaving like a VU meter. We could use an specific integrated circuit used for VU meters, but we decided to use a readily available integrated circuit: The LM324 op amp.

400 watts Stereo Amplifier Circuit using STK4050

400 watts Stereo Amplifier Circuit using STK4050

This 400 watts stereo amplifier circuit uses the Sanyo STK4050 hybrid IC, a high quality low noise amplifier. Its maximum output power is 200W per channel

Tone generator using two 555 timers

Tone generator using two 555 timers

This circuit uses the well-known 555 integrated circuit to generate a range of sounds that are heard through a small loudspeaker.

Audio Level Indicator Circuit Diagram using LM339

Audio level indicator circuit using LM339

This audio level indicator is very interesting because it allows us to visualize the audio level intensity by connecting this circuit to the input of a loudspeaker.

Guitar Synthesizer using CD4046

Guitar Synthesizer using CD4046

To achieve the objective, the CMOS PLL CD4046 integrated circuit is used, producing an unusual sound from a guitar whish sounds very similar to a synthesizer.


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