Velleman К8077 - Manual (Page 13)

13
26. Fixing the power transistors T8 (TIP147) & T9 (TIP142)
Fixing power transistors
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
the heatsink, press gently.
• apply a drop of heat conductive compound on the mica.
• Mount the transistor on the heatsink, using a 16mm bolt, lock washer and nut.
Make sure the transistor leads are correctly positioned
between the pins of the pinheader.
• Tighten gently.
+/
- 5
mm
Heat conductive
compound
Lock washer
M3 nut
M3 bolt
mica
T8 (TIP147)