What is an Audio Amplifier?
Generally speaking, An audio amplifier is a type of electronic amplifier that boosts the amplitude of a reproduced sound. Audio Amplifiers are an essential part of many consumer electronic devices such as audio amps, mono & stereo speakers, etc. They are cheap, easy to design & cost very little to repair or maintain. In today’s tutorial, we are going to go over a step-by-step process on how to make a simple audio amplifier using a 2SC2625 Power transistor.
The main component of this circuit is a 2SC2625 Power Transistor. 2SC2625 is a High Voltage High-Speed Switching Transistor. It is an NPN transistor in a TO-39 packaging, offering a max collector-base voltage of 450V & a collector current dissipation of 80W, thus using an appropriate heat sink during transistor operation.
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Hardware Required
The following components are required to make the Audio Amplifier project
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Power MOSFET | 2SC2625 | 1 |
| 2. | Loudspeaker | 3W | 1 |
| 3. | DC Jack | 3.5mm/male | 1 |
| 4. | Resistor | 2.2KOhm | 1 |
| 5. | Capacitor | 47uF/10V | 1 |
| 6. | Soldering Iron | 45W – 60W | 1 |
| 7. | Soldering wire & flux | – | 1 |
| 8. | DC Battery | 3.7V | 1 |
| 9. | Suitable Audio input | PC/Smartphone | 1 |
2SC2625 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 2SC2625
Useful Steps
Follow the steps as shown in the video above.
1) Solder the 2.2K Ohm resistor to the collector-base terminal of the transistor.
2) Solder the +ve terminal of the 47uF capacitor with a base of the transistor.
3) Solder the +ve terminal of the 3W speaker to the collector of the transistor.
4) Solder the -ve terminal of the DC power jack to the emitter of the transistor & the other terminal to the capacitor.
5) Connect a 3.7V Battery to the +ve terminal of the loudspeaker, and connect the -ve terminal to the emitter of the transistor.
Working Explanation
The working of this circuit is quite simple. An AC audio input is taken from a device such as a PC/a smartphone as input to the circuit. Here, a Capacitor (47uF) blocks the DC component of the signal, allowing only AC to pass through, which acts as a control signal to the base of the transistor (2SC2625).
The collector output of the transistor then goes to an audio transducer such as a loudspeaker to be generated as an audio output.
Applications
- Widely used in sound systems such as speakers, high-power megaphones, & large-scale acoustic systems.
- An integral part of entertainment systems such as home theatre setups.
- Also used in military applications such as acoustic weapons.
