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QAMP20 • 5
PARTS LIST FOR THE QAMP20 QRP POWER AMPLIFIER
CAPACITORS:
1 100 to 220 µf electrolytic capacitor [C1]
1 10 µf electrolytic capacitor [C2]
4 .1 µf disc capacitors (marked .1 or 104) [C3,8,10,13]
2 180 ρf disc capacitors (marked 180 or 181) [C4,7]
2 330 ρf disc capacitors (marked 330 or 331) [C5,6]
2 .001 µf disc capacitors (marked .001 or 102 or 1000) [C11,12]
1 .01 µf disc capacitor (marked .01 or 103 or 10 nf) [C9]
RESISTORS:
3 1 K ohm resistors (brown-black-red) [R1,5, TP1]
1 6.8 K ohm resistor (blue-gray-red) [R2]
2 10 K ohm resistors (brown-black-orange) [R3,12]
1 470 ohm resistor (yellow-violet-brown) [R6]
1 100 K ohm resistor (brown-black-yellow) [R7]
2 270 ohm resistors (red-violet-brown) [R8,9]
1 51 ohm resistor (green- brown-black) [R10]
1 2.2 K ohm resistor (red-red-red) [R11]
1 5 K potentiometer (marked 502M) [R4]
SEMICONDUCTOR DEVICES:
1 Zener diode, 6.2 volt (gray body with black band) [D1]
2 1N4148 type signal diodes (glass body with black band) [D2,3]
1 1N4002 style black epoxy diode [D4]
2 Power MOSFET transistors (marked P16NF06) [Q1,2]
2 2N3904 NPN transistors [Q3,4]
1 221334 PNP transistor [Q5]
OTHER COMPONENTS:
1 Relay DPDT 12 volt [K1]
1 PC mount pushbutton switch [S1]
2 RCA style PC mount phono jacks [J1,2]
1 2.5 mm DC power jack [J3]
2 Heatsink [HS1,2]
3 Yellow toroid coil core [L1,2,3]
1 10 µH inductor [L4]
1 2 hole small ferrite transformer core [T2]
1 2 hole large ferrite transformer core [T1]
7' #24 enameled magnet wire (thin wire) [for winding L1,2,3 and T1,2]
2 4-40 x ¼” machine screw
2 4-40 hex nut