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Low cost amplifer.

2018-02-27 10:41  
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Description.

No big deal here! You can make a decent power amplifier using just three transistors. All components used here can be obtained from your electronic junk box. Also you just need a 9V transistor radio battery to power this circuit. The circuit is ideal for a pocket radio or other hand held audio equipments.

The first part of the circuit here is a preamplifier consisting of transistor Q1(2N2222). The collector of the Q3 is coupled to the base of Q2 (2N2905A),which forms a complementary symmetry pair with Q3 (2N3053). The amplified signal is available at the junction of emitter of two transistors. Checkoutaudio amplifier circuittoo.

Circuit diagram with Parts list.

amplifier-circuit.JPG

Notes.

For Q1 you can try with any general purpose NPN transistors like BC107, BC148,etc.For Q2 and Q3 you can try any complimentary power transistors. The result may vary slightly.No problem.The can be also powered from a well regulated and filtered 9V DC power supply.Click Here!. To get the power supply circuit for this amplifier.Checkout LA4555 Audio Amplifier here
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