Various type of amplifier and pre-amplifier circuit has appeared in this website in amplifier and pre-amplifier section. The circuit posted here is of DIY headphone amplifier which is suitable for headphone or 8-ohm speaker or more impedance. The circuit is so designed that it has no risk of overloading or distortion of either the circuit or headphone. Circuit Description DIY Headphone Amplifier using 741 IC The heart of the circuit headphone amplifier is op-amp 741 which provide suitable gain where the transistor T1 and T2 are used to drive low…
Various kinds of stereo amplifier are readily available in market. But if we ask for good quality stereo amplifier with graphic equaliser facility, it’s price become very high. The cheaper varieties are generally based on discrete transistors, and suffer from drawback such as uncontrolled hum, ineffective tone control, poor base response, thermal runway etc. the use of inter-stage transformers in such circuits reduces their versatility. Here you find the tutorial to build 8W + 8W Stereo Amplifier with Graphic Equalisers. Features | 8W + 8W Stereo Amplifier Circuit with Graphic Equalisers…
An amplifier circuit diagram consists of a signal pick-up transducer, followed by a small signal amplifier(s), a large signal amplifier, and an output transducer. Initially, there are two types of amplifier circuit diagrams is in practical i.e. voltage amplifier circuit and power amplifier circuit. Voltage amplifier circuit | Amplifier Circuit Diagram The primary function of the voltage amplifier circuit is to raise the voltage level of the signal. It is designed to achieve the largest possible gain. Only very little power can be drawn from the output. To achieve high voltage…
An audio mixer circuit is used to combine output from several microphones/channels into one or more common outputs, usually for public address purposes or while recording. The function of the audio mixture circuit, as the name suggests is to ‘mix’ the different audio signals which are fed to the input for the mixer. In this article, we include various types of audio mixer circuits from the simplest possible transistor audio mixer circuit to the high-end audio mixer preamplifier using an operational amplifier. Description and Working of Audio Mixture Circuit The…
Preamplifier circuits, especially those having a high input impedance and those handling very small signals (and hence having high gain), are prone to be troublesome. All these are tested circuits, but one must emphasize the need for care while rigging up a preamplifier circuit. A preamplifier circuit is used to meet one or more of the following requirements: Signal amplification: Raw signal from the source generally lies in the region of 0.5mV to 100mV, whereas signal strength required at the input of the power amplifier for rated output is of…
The frequency of the AF oscillator can be varied over a wide range. It can therefore be used for AF amplifier testing and also as a code practice oscillator. Circuit Description of A Variable Audio Frequency Oscillator Using Op-amp 741 The circuit of variable audio frequency oscillator using op-amp 741 is mainly a Wein Bridge oscillator whose frequency is varied using the gang condenser. While using the IC1 741 (operational amplifier), the use of a split power supply has been avoided by using capacitors C1 and C2, for R4*, a 150-Ω…
PWM (pulse-width modulation) forms the basis for a very efficient form of power amplification. The circuit in figure 1 is a so-called class D power amplifier since the actual power amplification is provided to the PWM signal, and since it is of constant amplitude. The transistors used can function between cutoff and saturation. This allows for maximum efficiency (over 90%) and is the reason for the increasing popularity of class D amplifiers as a means of amplifying any analog signal. Circuit Description of PWM Generation Class D Power Amplifier The…
Operation Amplifier 741 Based Projects: The op-amp IC 741 is a DC-coupled, high gain differential amplifier with external negative feedback. IC 741 is characterized by the almost infinite open-loop gain (100,000), almost infinite input impedance (2MΩ), and almost zero output impedance (75Ω). IC 741 is the most popular, cheap, and easy-to-use op-amp. Some popular IC 741 names MCI741, LM741, SN72741, CA741, GS741, etc. IC741 can be used as an electronic integrator or differentiator, depending on the R-C network in the input and feedback circuit. Application of Operational amplifier:- The following…
As per the name of the circuit, it is clear that this circuit connects four different audio signals as one. So, it is call four channel audio mixer. Here is that simple circuit; “four channel audio mixer” using op-amplifier 741. It is to be noted in the circuit that the op-amplifier 741 works here as an inverting amplifier. Circuit Description of four channel audio mixer: The circuit of four channel audio mixer is wired around op-amp IC 741 followed by few other active as well as passive components. The IC 741…
Whereas an electric guitar with 60W PMPO (Peak Music Power Output) costs around $8, here is a cost effective solution to convert a Hawain guitar to an electric guitar. The circuit Guitar Amplifier | Convert Hawain Guitar to an Electric Guitar can also be used as an ampli-speaker with a tape recorder or a radio receiver. Circuit Description of Guitar Amplifier | Convert Hawain Guitar to an Electric Guitar The unit can easily be assembled on a standard TBA810 ampli-speaker PCB available in the market. It is also be housed in…
