Total solder points: 33 Difficulty level: beginner 1 2 3 4 5 advanced 7W MONO AMPLIFIER K4001 rpose ul multipu rf e w o p t u Small b amplifier. Specifications Music output power : 7W/4ohm RMS output power : 3.5W/4ohm or 2W/8ohm Power supply : 8-18VDC/0.5A Dimensions : 55x35mm (2.2” x 1.
VELLEMAN NV Legen Heirweg 33 9890 Gavere Belgium Europe www.velleman.be www.velleman-kit.
Features & Specifications Features: This small amplifier is constructed around the TDA2003 IC, capable of delivering 4Wrms at 4ohms. The IC is completely thermally and short-circuit protected. A conventional direct current can be connected as supply. Specifications : Music output power : 7W/4ohm RMS output power : 3.5W/4ohm or 2W/8ohm Total harmonic distortion : 0.
Assembly hints 1. Assembly (Skipping this can lead to troubles ! ) Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully. 1.1 Make sure you have the right tools: • A good quality soldering iron (25-40W) with a small tip. • Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and will protect the tip, and enables you to make good connections.
Assembly hints 1.3 Soldering Hints : 1- Mount the component against the PCB surface and carefully solder the leads 2- Make sure the solder joints are cone-shaped and shiny 3- Trim excess leads as close as possible to the solder joint DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE.
Construction 1. Resistors. 6. IC. 4. PCB tabs R... IN GND IC1 : TDA2003! LS GND R1 : 470 (4 - 7 - 1 - B) R2 : 4,7 (4 - 7 - B - B) R3 : 100 (1 - 0 - 1 - B) 2. Metal film resistor. R... R4 : 1 (1 - 0 - B - B - 9) 3. Capacitors. C1 : 8n2 (822) C2 : 100nF (104) C3 : 100nF (104) 6 +V GND 5. Electrolytic Capacitors. Watch the polarity ! C4 C5 C6 C7 : : : : 10µF 470µF 1000µF 1000µF C ...
Supply connection 7. Supply connection Figure 1 is an example of a suitable mains supply for this circuit. Naturally, you can also use batteries to power the circuit. FUSEHOLDER MAINS FUSE 1A T POWER SWITCH 240V 3A TRANSFORMER 12V AC 6VA RECTIFIER BRIDGE 1.5A 50V + - STRAIN RELIEF ELECTROLYTIC CAPACITOR 2200µF 25V Fig. 1.
Volume control 8. Volume control Adjust the volume by connecting a 47K logarithmic potentiometer as indicated in figure 2.0. TO AMPLIFIER SHIELDED CABLE Signal IN FROM SOURCE GND POTENTIOMETER 47K OHM LOG GND SIGNAL (+) 8 Fig. 2.
Connection example 9. Connection example Figure 3.0 is an example of a connection diagram of a 4 or 8 ohm speaker that is connected to the pins LS and GND. The input signal should be connected with the IN and GND pins. FROM AUDIO SOURCE 4/8 OHM SPEAKER - + + - 47K LOG POTENTIOMETER - + 8..18VDC / 0.5A Fig. 3.
PCB 10. PCB layout.
Diagram 11.
Modifications and typographical errors reserved - © Velleman nv. H4001IP - 2004 - ED1_rev.
