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Summary of Contents for Velleman K8077
- Page 1 100W SUBWOOFER KIT Total solder points: 383 Difficulty level: beginner 1 5 ⌧ advanced K8077 K8077 ILLUSTRATED ASSEMBLY MANUAL H8077IP-1...
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Page 2: Specifications
Features & specifications Features : bass-reflex system with adjustable tube compact size due to dual-speaker principle adjustable level and filter response auto power-on/off system phase switch (0°-180°) line level and speaker level inputs for maximum compatibility 'Full-range'-option for use in active speaker system separate chamber for electronics avoids air leaks Specifications power output: 100Wrms/ 4ohm (10% THD) - Page 3 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.
- Page 4 Assembly hints ⇒ Use the check-boxes to mark your progress. ⇒ Please read the included information on safety and customer service * Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as ‘NOTE’ on a separate leaflet. 1.3 Soldering Hints : 1- Mount the component against the PCB sur- face and carefully solder the leads...
- Page 5 Construction 1. Jump wires. R23 : 1K (1 - 0 - 2 - B) * R24 : 100K (1 - 0 - 4 - B) J1 … J8 R25 : 390K (3 - 9 - 4 - B) R26 : 15K (1 - 5 - 3 - B) R27 : 470 (4 - 7 - 1 - B)
- Page 6 Construction 4. Metallfilm resistors. 7. LEDs. Watch the polarity! R... CATHODE : 100 (1 - 0 - 1 - B - 9) : 470 (4 - 7 - 1 - B - 9) LD3 : RED (-35/+35VDC) : 100 (1 - 0 - 1 - B - 9) 8.
- Page 7 Construction 14. PCB tab SK12 : GND C20 : 0,047µF / 63V C21 : 0,068µF / 63V 15. Flat receptacles C22 : 4700pF/ 100V C23 : 0,022µF / 63V C24 : 0,022µF / 63V SK... AC BLUE AC RED 10. Diodes (check the polarity) AC GREY D11 : 1N5404 AC YELLOW...
- Page 8 construction 17. Potentiometers 18. Electrolytic capacitors. Watch the polarity ! C... COMPONENT SIDE C25 … C28 : 10µF / 35V : 22µF / 50V RV1 : Stereo log. 50K C30 … C35 : 100µF / 50V RV2 : Stereo log. 50K : 470µF / 16V 19.
- Page 9 Construction 20. Relais 23. LEDs LD1 : POWER (red) RY1 : VR5V242C LD2: ON (red) ( 24VDC - 5A - 2C) Mount both LEDs on the solderside at 8mm of the PCB cathode is marked with 'C'. 21. Electrolytic capacitors. Watch the polarity ! C37 : 3300µF / 50V C38 : 3300µF / 50V...
- Page 10 Fixing the knobs 24. Fixing the knobs Slide the knobs fully onto the potentiometer axes. Turn potentiometers fully counterclockwise Watch the position of the dot !
- Page 11 Fixing the PCB 25. Fixing the PCB onto the heatsink Fixing the PCB onto the heatsink : (1) Slide 2 x 5mm plastic spacers over the black bolts. (2) Carefully position the PCB onto the two bolts (3) fasten using two nuts. M3 nut Spacer M3 bolt 16mm...
- Page 12 Fixing the PCB Tighten gently, making sure that : the leds protrude the holes • the cinch (RCA) connectors do not touch the heatsink • the knobs do not touch the heatsink • the switches do not touch the heatsink •...
- Page 13 Fixing power transistors 26. Fixing the power transistors T8 (TIP147) & T9 (TIP142) bend both transistors as indicated. apply a drop of heat conductive compound on the heatsink. • position the mica onto the heatsink so that the hole coincide with the hole in •...
- Page 14 Fixing Diode D15 Solder the transistor leads • Repeat for the remaining transistor T9 (TIP142) 27. Fitting diode D15 (1N4007) Bend the leads as indicated. Put a large drop of heat conductive compound on the heatsink. Solder the diode to the two outer pins of the pin header.
- Page 15 Fitting transistor T7 28. Fitting transistor T7 (BC547) Bend the leads as indicated. Put a large drop of heat conductive compound on the heatsink. Solder the transistor to the remaining pins of the pinheader. The flat side of the transistor must face the heatsink.
- Page 16 Mounting power supply section 29. Mounting the power supply section 1. Mounting the AC connector Position the AC connector at the PCB side of the heatsink and fix by means of two 10mm black screws. 10mm screw 2. Mounting the power switch Click the power switch onto the heatsink.
- Page 17 Mounting power supply section 3. Mounting the fuse holder 2A T If necessary , enlarge mounting hole Place the fuse holder and fix with the included nut. Place a 2A T fuse.
- Page 18 Mounting power supply section 4. Fixing the transformer Rotate the transformer in such a way that the red/yellow/blue/grey wires point towards the PCB. Tighten the nut disk washer transformer washer bolt...
- Page 19 Mounting power supply section 5. Wiring the ground connection Connect one end of the cable to the red ring terminal. Connect the ring terminal to the chassis by means of a black bolt, spring washer and nut. M3 nut spring washer 16mm M3 bolt Scratch off anodizing for better conduction...
- Page 20 Mounting power supply section 6. Transformer wiring (red/yellow/blue/grey wires) Slide an insulation sleeve over each wire. Solder a connector to each wire SOLDER Slide the sleeve over the connector REMARK : In case you trim the wires, always remove the insulating lacquer (+/- 1cm) Connect the wires to the PCB.
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Page 21: Heatshrink Tube
Mounting power supply section Trim the black transformer wire to a length of 14cm. Slide a piece of heatshrink • tube (3cm) over the black transformer wire. 120VAC : ORANGE Unused lead 235VAC : BROWN 120VAC : BROWN 235VAC : ORANGE BLACK BLACK BLACK... - Page 22 Testing the unit 30. Testing the unit (120 / 235VAC) From K8077 Power supply 120 / 235VAC Make sure that the IC’s are removed from their sockets. We recommend to construct a small test-jig, and connect the unit as shown below.
- Page 23 Enclosure assembly 31. Assembly of the enclosure Refer to the included mounting instructions. Mark all holes according to the diagram. Use a 2mm drill to pre-drill the holes Mark the two holes for the speakers, as indicated. Mark the hole for the reflex tube, as indicated Carefully cut-out the holes using an electric jigsaw If necessary, smooth the edges with sanding paper Mark the position of the wooden supports for the heatsink.
- Page 24 Enclosure assembly - Fix the speaker wires with some glue and trim them to a length of 20cm - Slide an insulating sleeve over both wires. Solder a connector to both wires and slide the insulating sleeves over the connector. - Fix the 4 plastic feet by means of a 23mm screw and put the enclosure on its feet.
- Page 25 Placement 32. Placement For best results, experiment with different positions. We recommend to put the unit between the main speakers. The closer to a wall or corner, the higher the efficiency (volume) will be, at the cost of a reduced sound quality. Remark: The unit is not magnetically shielded.
- Page 26 Connection 33. Connection Just below the power switch you will notice two AC voltage indications (120VAC- 235VAC). Strike out the one that does not apply with a black permanent marker. Use the supplied cord to connect the unit to the AC power grid. If necessary, cut the plug and replace it with a plug (not incl.) that fits your outlets.
- Page 27 34. Use Turn the volume control (OUTPUT LEVEL) fully counter clockwise before first • power-on. Turn-on the 'POWER'-switch. The 'POWER'-led will light. • The unit will either immediately turn on ('ON'), or wait for an incoming audio sig- nal ('AUTO-ON'), depending on the position of the 'MODE'-switch. If 'AUTO-ON' has been selected, the unit will automatically turn-on when an audio signal is present.
- Page 28 35. PCB...
- Page 29 Schematic diagram 36. Schematic diagram PSU :...
- Page 30 Schematic diagram Power stage :...
- Page 31 Schematic diagram Filter section :...
- Page 32 VELLEMAN KIT NV Legen Heirweg 33 9890 Gavere Belgium Europe Info ?: http://www.velleman.be Modifications and typographical errors reserved © Velleman Kit nv H8077IP - 2006 - ED1 (rev 3.0) 5 4 1 0 3 2 9 3 5 9 6 7 6...
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