Power in the pocket, part 1
a simple PWM amplifier
Materials
Gerber file
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Extra info / Update
Technical specifications
- 1 W into 8 O, 1.7 W into 4
- Class-D
- Power supply 6 to 9 V (4x AA cell)
- Very compact
- Simple construction without SMDs
Component list
Resistors
R1 = 470k
R2 = 10k
R3 = 12k
R4,R5 = 220
R6 = 8O2
Capacitors
C1 = 10µF 63V, radial, 6mm diam.
C2 = 100nF ceramic, lead pitch 5mm
C3 = 100µF 40V, radial, 8mm diam., lead pitch 0.1" (2.5mm)
C4 = 270pF, ceramic, lead pitch 0.2" (5mm)
C5 = 330nF, MKT, lead pitch 0.3" (7.5mm)
C6 = 220nF, MKT lead pitch 0.3" (7.5mm)
C7 = 1000µF 25V, radial, 10mm diam., lead pitch 0.2".
Inductors
L1 = 40µH 2A axial (mount vertically) e.g. Epcos type B82111EC23; Farnell # 9753354
Semiconductors
D1,D2 = BAT85
T1 = IRFU9120NPBF (TO-251AA/I-PAK, International Rectifier) e.g. Farnell # 8659206
T2 = IRLU120NPBF (TO-251AA/I-PAK, International Rectifier) e.g. Farnell # 8651345
IC1 = 4050
Miscellaneous
S1 = 1 make contact, 1A min. (not on PCB)
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