Mini-box 2W Amplifier
Saturday, 31 October 2009 22:08 | Written by EEE-LAB | 
| Audio |
How to make a Mini 2W Amplifier?
This is a Low cost and simple circuit for 2W mini amplifier.
Circuit Diagram:
Parts List:
| P1 = 10K | Log.Potentiometer |
| R1,R2 = 33K | 1/4W Resistors |
| R3 = 33R | 1/4W Resistor |
| R4 = 15K | 1/4W Resistor |
| R5,R6 = 1K | 1/4W Resistors |
| R7 = 680R | 1/4W Resistor |
| R8 = 120R | 1/2W Resistor |
| R9 = 100R | 1/2W Trimmer Cermet |
| C1,C2 = 10΅F | 63V Electrolytic Capacitors |
| C3 = 100΅F | 25V Electrolytic Capacitor |
| C4,C7 = 470΅F | 25V Electrolytic Capacitors |
| C5 = 47pF | 63V Ceramic Capacitor |
| C6 = 220nF | 63V Polyester Capacitor |
| C8 = 1000΅F | 25V Electrolytic Capacitor |
| D1 = 1N4148 | 75V 150mA Diode |
| Q1 = BC560C | 45V 100mA PNP Low noise High gain Transistor |
| Q2 = BC337 | 45V 800mA NPN Transistor |
| Q3 = TIP31A | 60V 4A NPN Transistor |
| Q4 = TIP32A | 60V 4A PNP Transistor |
| SW1 | SPST switch |
| SPKR | 3-5 Watt Loudspeaker, 8, 4 or 2 Ohm impedance |
Technical data:
Output power: 1.5 Watt RMS @ 8 Ohm, 2.5 Watt @ 4 Ohm, 3.5 Watt @ 2 Ohm (1KHz sinewave)
Sensitivity: 100mV input for 1.5W output @ 8 Ohm
Frequency response: 30Hz to 20KHz -1dB
Total harmonic distortion @ 1KHz & 10KHz: Below 0.2% @ 8 Ohm 1W, below 0.3% @ 4 Ohm 2W, below 0.5% @ 2 Ohm 2W
Source: http://electronics-lab.com/projects/audio/003/index.html
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Last Updated (Saturday, 31 October 2009 22:19)