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QAMP-40 • 9
30. Install C12, another .001 µf disc capacitor (marked .001 or 102).
31. Install C8, .1µf disc capacitor (marked .1 or 104).
These last four parts (R8,9 and C11,12) form parasitic suppression networks
across each transistor to suppress any tendency for high frequency oscillation
in the power amplifier.
32. Install C3, another .1µf disc capacitor (marked .1 or 104). Both of these
capacitors bypass the center tap of the ferrite transformers to ground.
Bypass means to provide a low impedance path to ground.
33. Install C1, 100 to 220µf electrolytic capacitor. Be sure to observe
correct polarity.
34. Install C4, 560ρf disc capacitor (marked 560 or 561).
35. Install C5, 330ρf disc capacitor (marked 330 or 331).
36. Install C6, another 330ρf disc capacitor (marked 330 or 331).
37. Install C7, another 560ρf disc capacitor (marked 560 or 561).
38. Install wire jumper, JMP1. Use a scrap piece of component lead wire.
39. Locate the MOSFET power transistors and prepare the leads for
insertion into the PC board. Bend down the two outside leads about 1/8"
from the transistor body and the center lead about 3/16" from the body.
40. Mount the transistors and heatsinks to the PC board using the 4-40
screws and nuts. Solder all transistor leads. Note that the heatsinks
may look slightly different from the ones shown.
Transistor bend pix