200W DISCRETE POWER AMPLIFIER K8060 or system e r e k a e tr sp me thea r active Ideal fo guitar amp, ho , etc.
Features & Specifications Specifications: Excellent value for money Full discrete design using Epitaxial Darlington transistors DC supply circuit on board with LED indication Ideal for active speaker system or sub woofer, guitar amp, home theatre systems, instruments amp…. Comes complete with transistor isolators, spacers and bolts Overload and short circuit protection Features: 200W music power @ 4 ohm load 100Wrms power @ 4 ohm load 70Wrms power @ 8 ohm load 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.
Construction 1. Diodes. Watch the polarity ! D1 : 1N4148 D2 : 1N4148 CATHODE D... 2. Zenerdiode. Watch the polarity ! ZD1 : 9V1 CATHODE ZD...
Construction & connection 7. Trim potentiometer 5. Power diodes. Watch the polarity ! D3 : D4 : D5 : D6 : 1N5404 1N5404 1N5404 1N5404 RV1 : 1K D... 6. Capacitors. C... C3 C4 C5 C6 C7 C8 6 : : : : : : 47pF 680pF 680pF 47nF 100nF 100nF IN GND CATHODE +/-5mm C1 : 47pF C2 : 47pF 10. PCB tabs. RV1 (47) (47) (47) (681) (681) (473) (104) (104) 11. Electrolytic Capacitors. Watch the polarity ! 8. Transistors.
Construction 13. 5W resistors R19 : 0,47 R20 : 0,47 R... 2mm IMPORTANT 14. Electrolytic Capacitors. Watch the polarity ! C12 : 3300µF C13 : 3300µF Check the complete assembly carefully before mounting the heat sink. Once the heat sink is mounted, the solder-side is no longer accessible. C... Hint for tweakers : Replace the original caps with 4700µF/50V types for even better performance.
Final Assembly 15. Final assembly A custom pre-drilled heat sink is available from your distributor (order code HSVM100). Any other heat sink must be able to dissipate at least 30W (1.25°C/W) (see fig.1.0). Use the template as a drill guide. Fig. 1.
Final assembly Mount 4 bolts + 8 nuts (PCB support). (fig.2.0) Slide the PCB over the 4 bolts, and fix using 4 nuts (Fig 3.0). 2 x M3 nut Fig. 3.0 M3 15mm bolt Fig. 2.
Transistor T6 16. Mounting the transistor T6 on the heat sink: Apply a drop of heat conductive compound in the heat sink hole (fig. 4.0). Fig. 4.
Transistor T6 Insert the transistor (BC547) in the hole (Fig. 5.0). Pay attention to the position of the transistor (fig 6.0)! BC547 Fig. 5.0 Fig. 6.0 Carefully bend the leads and solder them to the connector T6, see figure 7.0. Fig. 7.
Power transistors 17. Mounting of the power transistors T7 (TIP147) and T8 (TIP142). M3 nut Apply a drop of heat conductive compound on the heat sink (see fig 8.0.) Mount the isolation mica onto the heat sink, check the position of the hole. Lock washer washer plastic isolation washer Apply a drop of heat conductive compound on the mica. Carefully bend the leads, see fig. 9.0 Mount the transistor on the heat sink, using a bolt, washer, lock washer Heat conductive compound and nut.
Power transistors Solder the connections of the power transistors with the pin headers, see fig. 10. Fig.
Test & adjustments 18. Test and adjustments Use a 2 x 25 to 30Vac / 100 - 120VA transformer. Connect the transformer to the AC power connections of the PCB. The Velleman transformer colour scheme is specified on the pcb. Careful : Other brands may feature a different scheme ! SOLDER Y: yellow, R: red, B: blue, G: grey. Y Make sure to put a 1A T (slow-blow) fuse in series with the primary winding of the transformer (see diagram).
Test & adjustments 15
Test & adjustments Turn the RV1 bias adjust trimmer fully counter clockwise (turn left) before applying power for the first time. ADVICE: For safe first-time testing insert a 60W light bulb in series with the AC power and the transformer. If the light bulb lights up continuously, disconnect the transformer and check all your wiring and assembly. Reconnect the power supply. If the lamp remains off, everything is OK, replace the light bulb with a fuse.
Test & adjustments Final connection: The input (GND and in) can be connected directly to an audio source (pre-amp or mixing panel) or a volume control (potentiometer) can be used (see diagram). Connect the speaker (4 ohm or higher) to the connections LS+ and GND. CAUTION: VOLTAGES OF ABOUT 80V ARE PRESENT.
Diagram 19. Diagram +40V D6 SK4 AC 1N5404 D5 SK6 AC-0 SK5 AC-0 C13 4700µ/50V C7 100nF C5 1N5404 D4 680p GND GND 1N5404 D3 SK3 +40V +40V R18 33K C12 4700µ/50V AC C8 100nF R12 1K5 LD1 LED3RL +40V 1N5404 T8 TIP142 D1 1N4148 R13 3K3 -40V T4 BC547 R11 3K3 SK8 LS+ RV1 Bias adj. GND C9 BC640 T2 T1 BC640 In C2 47p R3 3K3 R7 680R C11 R2 100R R6 47R T5 BC557 R15 1K R4 47p 330R T3 BC639 R20 0.
VELLEMAN NV Legen Heirweg 33, B-9890 GAVERE Belgium (Europe) Modifications and typographical errors reserved © Velleman nv. H8060IP - 2014 - ED1 (rev.