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This article lists various types of audio amplifier circuits using Mosfet. We have tested all these circuits in our lab and we found all of them performing satisfactorily.
Mosfet is a 3 terminal semiconductor device used in a wide range of electronic circuits. It works like a JFET but has less current leakage owing to an oxide insulation between the conductors. Mosfet is a good choice for building linear amplifiers owing to its lesser load, and any amplifier made using it is called a Mosfet amplifier.
These amplifiers have a wide range of applications, they can be used in many circuits. Note: This article will be modified with new versions of Mosfet amplifier circuits in future; we shall notify new additions to our home page. This article contains the following list of amplifier circuits using Mosfet. This circuit is an audio amplifier capable of delivering a decent output power with a minimum no: of parts, with considerable sound quality.
This tiny circuit can deliver a whopping 18Watts into 8 Ohm speaker or 30W into a 4 Ohm speaker. To get such a good performance and stability out of few components, a high quality well regulated DC power supply is necessary. This is very essential for reducing noise and getting a constant output power on varying loads.
A good DC voltage regulator able to provide more than 2 Amps 40V can be used. You can expect such a power supply design very soon here in the power supply section. Assemble the board on a good quality PCB. Use a preamplifier board with tone control prior to this amplifier to get better performance. Single rail supply is seldom used in Class-B power amplifiers. Actually, I got this circuit from an old cassette player that is still working and I am publishing it as it is.
Transistors Q1 and Q2 are wired as a Darlington pair works as the preamplifier. Preset R3 controls the quiescent current while R2 provides feedback. The output is coupled to a speaker through capacitor C4. Capacitor C5 is the power supply filter and C2 is the input DC decoupling capacitor. The first stage of the amplifier is a differential amplifier based on transistors Q1 and Q2. Capacitor C8 is the input DC decoupler, R1 limits input current and capacitor C1 bypasses unwanted high frequencies.
The second stage is the driver stage consisting of transistors Q3 and Q4. The output is coupled with the speaker using the inductor L1. The network comprising of R15 and C5 is meant for noise reduction. Capacitors C6 and C7 are power supply filters. Preset R6 is meant for adjusting the quiescent current.
Hello, would it be okay to use this design for an academic paper? We are doing research for a senior design paper for our undergrad degree in electrical engineering and we need an audio power-amp circuit.
Please let us know if this is alright with you. How about it? Hi Ramesh any transistor is a current amplifier. If current gain of a transistor as per data sheet is say at 1Amp.
You require a base emitter current of 10 mA, to have the conduction of 1 amp through collector and emitter. The transistor cannot generate current it can only vary its collector emitter resistance to achieve the required current flow through collector emitter junction as per base emitter current bias. Is it missing or not needed for some reason maybe the diff amp? I have A 50 Watt 6 ohm subwoofer with 5 speakers 50 watt 5 ohm each.
Hi Ali for your sub woofer speaker use motional feed back amplifier appeared in our column earlier. For the speakers use TDA amplifiers each. Power up the amplifier without applying an input signal. Let the circuit warm up for about 10 minutes. Measure the current in the positive supply. Adjust R6 until a current between 50 and 60mA is measured. C5 needs be no more than 35 volts. Author admin. Frequency counter using arduino February 19, Motor speed control using arduino June 12, Bajee 5 years ago.
Mubarak 6 years ago. Samuel Pharmer 6 years ago. Hello Samuel, You can use with creative commons rights. Please give us credits. I want a circuit of intex subwoofer model itsuf plz give the circuit and oblige.
Ramesh 6 years ago. Sir please tell me the current amplifying transistors plzzzzzzz. Seetharaman 6 years ago. JOHN 6 years ago. Hi sir!!
Travis 6 years ago. Ali Nasir Dharejo 7 years ago. Seetharaman 7 years ago. Massimo Petrucci 8 years ago. How about the quiescent current of 50w power amp? Ollie Oz 7 years ago. Thanasis 9 years ago. Jonathan 9 years ago. Submit Type above and press Enter to search. Press Esc to cancel.
Simple two transistor amplifier
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3DD4202BD TRANSISTOR. Datasheet pdf. Equivalent
This article lists various types of audio amplifier circuits using Mosfet. We have tested all these circuits in our lab and we found all of them performing satisfactorily. Mosfet is a 3 terminal semiconductor device used in a wide range of electronic circuits. It works like a JFET but has less current leakage owing to an oxide insulation between the conductors.
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