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  4. POWER BLOCK K8081
  5. Illustrated Assembly Manual

Velleman POWER BLOCK K8081 Illustrated Assembly Manual

Manual is about: POWER AMPLIFIER

Summary of POWER BLOCK K8081

  • Page 1

    Total solder points: 383 difficulty level: beginner 1 2 3 4 5 ⌧ advanced powerblock - power amplifier illustrated assembly manual h8081ip-1 this amplifie r is an ideal s et-up for acti ve speaker us e. K8081 k8081.

  • Page 3

    3 features & specifications this power amplifier is an ideal set-up for active speaker use. Build a high-quality system, using two (stereo) or more (surround) amplifiers. Due to its auto switch-on, through input signal sensing, the unit can be installed at almost any place. Comes complete with enclo...

  • Page 4

    4 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 ...

  • Page 5

    5 ⇒ 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 aga...

  • Page 6

    6 construction r1 : 330 (3 - 3 - 1 - b) r2 : 220 (2 - 2 - 1 - b) r3 : 47 (4 - 7 - 0 - b) r4 : 3k3 (3 - 3 - 2 - b) r5 : 100 (1 - 0 - 1 - b) r6 : 22k (2 - 2 - 3 - b) r7 : 120 (1 - 2 - 1 - b) r8 : 2k2 (2 - 2 - 2 - b) r9 : 680 (6 - 8 - 1 - b) r10 : 3k3 (3 - 3 - 2 - b) r11 : 3k3 (3 - 3 - 2 - b) r12 : 10 ...

  • Page 7

    7 construction ic1 : 8p ic2 : 8p ic3 : 6p 5. Ic sockets. Watch the position of the notch! Rv1 : 1k bias adjustment 6. Trim potentiometer r 4 t1 : bc640 t2 : bc640 t3 : bc639 t4 : bc547 t5 : bc557 t6 : bc547 t7 : bc547 8. Transistors t1 make sure that transistor t7 is bent towards diode d11. Make sur...

  • Page 8

    8 construction gnd : 1 pin test : 1 pin +40v : 1 pin t8 : 6 pins t9 : 6 pins 10. Pinheaders r42 : 0,47 r43 : 0,47 12. 5w resistors r... 2mm ls+ ls- ac red ac grey ac yellow ac blue 13. Flat receptacles sk... Sk5 : in 11. Male board wire connector ld1 : yellow (standby) ld2 : blue (on) ld3 : red (che...

  • Page 9

    9 construction mount following diodes 15mm above the pcb : d14 : 1n5404 d15 : 1n5404 mount following diodes 10mm above the pcb : d12 : 1n5404 d13 : 1n5404 15. Power diodes (check the polarity) cathode d... Ry1 : vr5v242c ( 24vdc - 5a - 2c) 16. Relay c23 : 3300µf / 50v c24 : 3300µf / 50v 17. Electrol...

  • Page 10

    10 20. Assembly of the unit assembly • cut all connections to 1.5mm make sure that the solder connections don't touch the housing. 1 • fix rubber foot in center of pcb 2 use the colour pictures on packaging as guideline max. 1.5mm.

  • Page 11

    11 3 • slide the pcb into the heatsink 4 • fix the pcb using 4 bolts + nut • fix the 4 nuts inside assembly.

  • Page 12

    12 assembly 5 • bend c4 away from t9 • bend c5 away from t8.

  • Page 13

    13 6 • apply some heat conductive silicone grease to tran- sistor and diode. 7 • place the m3 bolt for t8 and t9 • mount the isolator to heatsink, apply grease to both sides assembly m3 bolt isolator.

  • Page 14

    14 8 • bend the leads for t8 (tip142) and t9 ( tip147) like in the photograph. 9 lock washer 6mm m3 nut • position the transistors t8 (tip142) and t9 (tip147) and fix using lock washer and 6mm m3 nut. Assembly.

  • Page 15

    15 assembly 10 • solder the connections carefully, check by trying to move the leads after soldering • prepare the speaker output cables (red & black), one side with terminal + cover, other side with eyelet connector 11 • remove the isolation speaker output connection set.

  • Page 16

    16 • mount all connectors and fuse, check position of speaker connector and switch holder to the rear panel 12 • position the fuse holder exactly like in the picture 13 assembly rear panel inside view.

  • Page 17

    17 assembly 15 twist the connector wire 14 • align the rca mounting nut • solder the 2 wire connector cable to the rca, brown = signal ground & red = signal. Re d br ow n.

  • Page 18

    18 16 • connect the speaker wires exactly like in the picture ( + = red wire) assembly • insert 2 a slow blow fuse 17 18 • cut 3 pcs. Of 3cm from the shrink tube 3cm 3cm 3cm.

  • Page 19

    19 19 • solder one 8cm brown wire to the switch and one to the fuse holder assembly 20 • slide a piece of shrink tube over the transformer mains connections : black wire brown wire (100-120vac) or the orange wire (220-245vac) • connect the black wire to the power switch • connect the orange (~230vac...

  • Page 20

    20 22 • isolate the not used transformer wire using a piece of tape. Assembly 23 • shrink the tube using heater or hair dryer..

  • Page 21

    21 24 • apply glue to the transformer protector 25 • position the protector like in the drawing assembly • solder terminal + cover to the 4 transformer wires 26.

  • Page 22

    22 assembly • position the rear panel and the transformer 27 • fix the rear panel, use 4 self tapping screws..

  • Page 23

    23 29 • connect the ac connectors red, blue, grey and yellow assembly 28 • connect the input signal connector.

  • Page 24

    24 assembly 30 • connect the speaker + ls red and - ls black wires -ls (black) +ls (red) 31 • check the wire styling and apply straps.

  • Page 25

    25 assembly • stick the isolator foil to the transformer 33 32 • position the transformer insulation rubber.

  • Page 26

    26 test 21. Testing the dc protection circuit : 1 preliminary test: verify that the amplifier is turned off (switch at rear panel) turn the rv1 bias adjust trimmer fully counter clockwise (turn left) for first time testing, insert a 60w light bulb in series with the ac power line. Connect the power ...

  • Page 27

    27 • briefly connect the +40v test point with the test pin. The red check led should blink and the relay should switch off. 3 dc error detection test: turn off the ac power. The amplifier is now ready for use. Test 40v test voltage test point check led.

  • Page 28

    28 4 • mount the front panel • fix the front panel, use 4 self tapping screws. • check the position of the leds 5 • mount the transformer positioning plate 6 test.

  • Page 29

    29 test 7 • position 4 spacer nuts check that the fixation bolt does not make contact with the wires!.

  • Page 30

    30 • mount the bottom panel using 4 hexagonal bolts and fix in each corner a rubber foot 8 test rubber foot hexagonal bolt.

  • Page 31

    31 22. Connection connection power supply ~ 235vac or ~115 vac loudspeaker (-) 4- 8 Ω loudspeaker (+) 4- 8 Ω input signal connect the input signal, coming from a pre amplifier, volume and tone control (ex k8084), mixing panel.. Connect speakers, it is advised to use 4 ohm speakers for maximum output...

  • Page 32

    32 standby : lit when mains power is on ( fuse ok) on : lit when amplifier is on ( input signal is amplified ) check : has 2 functions 1– blinks short if no signal is sensed during on 2– blinks fast if error detected, the amplifier is turned off if an amplifier error is detected, this can be due to ...

  • Page 33

    33 pcb 23. Pcb.

  • Page 34

    34 24. Schematic diagram schematic diagram r4 2 0.47 r4 2 0.47.

  • Page 36

    Velleman kit nv legen heirweg 33 9890 gavere belgium europe info ?: http://www.Velleman.Be modifications and typographical errors reserved © velleman kit nv h8081ip - 2007 - ed1 (rev.2.0) 5 4 1 0 3 2 9 3 6 0 0 5 4.