Audio Circuits
Audio Circuits
4-channel audio mixer using LM3900 IC
4-channel audio mixer using LM3900 IC
4 operational amplifiers, some resistors and capacitors to implement an audio mixer with a very simple design.
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.
2 watts Audio Amplifier Circuit with the TDA2822M IC
TDA2822M 2 watt audio amplifier circuit
This 2 watt audio amplifier circuit is specially designed to consume little power and to be used with batteries or low voltage power sources.
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.
Microphone Mixer using operational amplifiers
Microphone Mixer using operational amplifiers
This Microphone Mixer combines signals from 3 different sources (3 microphones) easily and economically.
6 Watts Audio Amplifier Circuit with TDA2613 (Hi-Fi)
6 Watts Audio Amplifier Circuit with TDA2613 (Hi-Fi)
High fidelity 6 watts audio amplifier circuit with the TDA2613 Integrated Circuit, very easy to implement due to its very few external components
Electronic Music Metronome circuit using a 555 timer
Electronic Music Metronome circuit using a 555 timer
This Electronic Music Metronome circuit, allows those persons who study or are music fans, to keep the timing, quite accurately.
1 Input – 4 Outputs Stereo Audio Splitter
1 Input – 4 Outputs Stereo Audio Splitter
This 1 Input – 4 Outputs Stereo Audio Splitter has a single input and 4 independent outputs, each amplified with an operational amplifier. Each op amp is configured as a voltage follower, to take advantage of its high input impedance and low output impedance, thus avoiding distortion in sound.
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.
