Ramsey Electronics QRP CW POWER AMPLIFIER KIT QAMP30 - Manual (Page 9)

QAMP-30 • 9
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.
ˆ 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.
ˆ 33. Install C1, 100 to 220 µf electrolytic capacitor. Be sure to observe
correct polarity.
ˆ 34. Install C4, 330 ρf disc capacitor (marked 330 or 331).
ˆ 35. Install C5, 560 ρf disc capacitor (marked 560 or 561).
ˆ 36. Install C6, another 560 ρf disc capacitor (marked 560 or 561).
ˆ 37. Install C7, another 330 ρf disc capacitor (marked 330 or 331).
ˆ 38. Install wire jumper, JMP1. Use a scrap piece of component lead wire.
ˆ 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.
ˆ 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