50W OCL Main Amplifier Circuit using LF351

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50W OCL Main Amplifier Circuit using LF351
Contents hide
1 Introduction
2 Hardware Required
3 Circuit Diagram

Introduction

Do you want t know and make an amplifier without having an output capacitor? let’s jump into the OCL amplifiers. Because it possesses direct-coupled capacitors output capabilities, the OCL power amplifier qualifies as an “output capacitor-less amplifier”. This might belong to one of the numerous amplifier classes. Thus, in this Tutorial, we are going to make a “50W OCL Main Amplifier Circuit using LF351”.

Using an OCL amplifier as opposed to an amplifier linked with a capacitor has certain benefits. For example, an output capacitor reduces the cost of capacitors. Also,  an OLC amplifier is more compact. The output power of an OCL amplifier is significantly higher when extremely low frequencies are present, which is the best part.

In the making of the circuit, we are using LF351. But, if you are looking for an alternative to the LF351, consider the NE5534N or the TL07`. Both of these amplifiers offer similar performance characteristics to the LF351 but with different advantages and disadvantages that could suit your specific needs better.

Hardware Required

S.noComponentValueQty
1.TransistorMJ2955, BD139, BD140, 2N30551,1,1,1
2.Resistor Different Values–18
3.Capacitor47uf, 10uf, 100uf2, 1, 1
4.Variable Resistor1K,50K1,1
5.ICLF3511
6.Diode & ZENER Diode1N41482,2
7.Speaker–1

Circuit Diagram

50W OCL Main Amplifier using LF351-2N3055-MJ2955 with PCB

Working Explanation

In this 50W OCL Main Amplifier, we are using LF351, because of the noise reduction and, higher frequency responsiveness. The output signal of IC1 is sent to the transistor drivers Q1, and Q2 through two 1N4148 diodes D1 and D2 (BD140). The current is then routed to two major transistor outputs, Q3 (MJ2955) and Q4 (2N3055). The idle current of this amplifier circuit is controlled by the tiny potentiometer VR2.

This circuit is quite simple to modify. You do not need to measure the IDLE current if you do not have an ammeter. You simply need to change the VR2 in the center.

Application Uses

  • Home theater system
  • Car audio system

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