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 .1 µf 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 220 µf electrolytic capacitor. Be sure to observe correct polarity.
34. Install C4, 180 ρf disc capacitor (marked 180 or 181).
35. Install C5, 330 ρf disc capacitor (marked 330 or 331).
36. Install C6, another 330 ρf disc capacitor (marked 330 or 331).
37. Install C7, another 180 ρf disc capacitor (marked 180 or 181).
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. | Transistor bend pix |
40. Mount the transistors and heatsinks to the PC board using the
We're almost finished. All we need to do now is install a few remaining parts that have to be handmade - for that
QAMP20 • 9
