Guitar Preamplifier Circuit Using IC TL071

Here is the circuit of a electric guitar preamplifier based on IC TL071.The pickup device has a transducer on one end and a jack on the other end. The jack can be plugged into a preamplifier circuit and then to a power amplifier system.

The mechanical vibrations from low frequency bass to a certain extent of high frequency is picked up by a guitar or violin pickup device and converts them into an electrical signal, which can then be amplified by an audio amplifier. This circuit diagram of guitar pre amplifier has two output options - one to a power amplifier and other one could fed to a headphone.

Simple Laptop Audio Amplifier Circuit

When it comes to laptop sounding, most of the laptops currently in the market has very low sound output (laptops like DELL XPS is an exception). If you need more powerful sound, you need to amplify the sound output from the laptop. Here's a simple amplifier circuit making use of the SANYO LA4440 IC which is ideal for low power audio applications because it gives better sound clarity and less distortion.

Laptop audio amplifier circuit

Fortunately the circuit diagram is very simple and even a beginner can assemble and debug it. The circuit is built around the previously mentioned LA444o IC and a few components. The amplifier is a dual channel one with 6W for each channel. So a 10 W speaker would be very sufficient. Connect pins 2, 6 and ground of IC1 to the stereo jack which is to be used with the laptop.

Automatic Muting Circuit For Audio Systems

Here's a circuit diagram of automatic muting for audio systems using IC LB1403. The signal from pre-amplifier such as LA3160, LA3161 or HA1032 is connected to the base of the amplifier transistor BC548 (T1). Variable resistor VR1 is used to control the gain of input signal.

Bass And Treble Circuit Using Transistor

 This circuit diagram for bass and treble control is effective and using low cost components.

Modern audio frequency amplifiers provide flat frequency response over the whole audio range from 16 Hz to 20 kHz. To get faithful reproduction of sound we need depth of sound, which is provided by bass (low notes). Hence low-frequency notes should be amplified more than the high-frequency notes (treble). To cater to the individual taste, and also to offset the effect of noise present with the signal, provision of bass and treble controls is made. The combined control is referred to as tone control.

22W Mobile Car Stereo Power Amplifier

The circuit diagram shows a powerful stereo amplifier which can deliver a power of 22W.It is built around popular single-chip audio power amplifier TDA1554Q (IC1).Here it is configured as two 22W stereo bridge amplifiers.

Listening to songs stored in mobile phone while driving is dangerous. It's also against laws. But you can use your mobile phone as a stereo music source and it requires amplification to drive speakers. Also This does away with the need of a sophisticated in-dash car music system.

TDA2030 Subwoofer Amplifier Circuit

This TDA2030 amplifier circuit is ideal for driving low frequency subwoofer speakers in home theater systems.The TDA2030 is a monolithic integrated circuit intended for use as a low frequency class AB amplifier.

Simple Audio Amplifier Circuit Using LM386

Here is a simple low power audio amplifier circuit that can produce a power output of 1W. This mono amplifier circuit is build on LM386 IC which works great on low voltages even below 9V. This low voltage amplifier is useful to amplify weak sound signals from your soundcard to amplify it to give to the headphones  or high power amplifiers for maximum sound effect.

Sound Level Meter Circuit Using LM3915

How ever nowadays trend is using digital audio equilisers, here is an audio level meter circuit using LM3915 sound level IC. This IC works great on even low voltages up to 3V to as high as 20 volts. This Audio indicator circuit is designed to give an input of 1v (p-p) and a maximum input voltage of 1.4 V.