paX: a power amplifier with error correction (2)
The voltage amplifier and input buffer stages
Materials
Gerber file
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Component list
Resistors
(0.25W metal film)
R1-R4,R6,R8,R17,R18 = 47Ω
R7 = 220Ω
R9,R10,R12,R25,R34 = 4kΩ7
R11 = 249Ω
R13 = 2kΩ74
R16 = 5kΩ23
R19,R20,R30,R31 = 2kΩ15
R21-R24,R60 = 100Ω
R26,R27,R33,R40-R43,R46,R51 = 1kΩ
R28 = 10Ω
R29 = 3kΩ0
R32 = 33Ω
R35,R36 = 619Ω
R37,R38 = 680Ω
R39,R45 = 1MΩ
R44 = 7kΩ5
R47,R48 = 1kΩ8 2W MF
R49,R50 = 10 kΩ
R52-R55 = 0Ω22 5W ceramic
R64 = 1Ω5 2W
R65 = 6(8 2W
RV1, RV2 = 200( multiturn trimmer
R5,R14,R15,R56-R59, R61-R63 = not present
Capacitors
C1,C3,C23 = 150pF polypropylene
C2, C4,C5,C9,C14-C16,C19,C22, C24,C25 = 100nF cer.
C6-C8,C13,C21 = 1µF 63V foil
C10 = 220nF 50V cer.
C11,C12,C17,C18 = 470µF 63V
C26 = 1nF foil
Inductors
L1 = 5µH (see text)
Semiconductors
D1, D2, D5,D6,D10,D11 = zener diode 15V 0.5W
D3,D4,D9,D12,D13,D14 = 1N4148
D7,D8 = 1N4003
Q1,Q2,Q9 = 2SA1208
Q3,Q4,Q10 = 2SC2910
Q5,Q11,Q17,Q18 = BC546B
Q6,Q14,Q19,Q20 = BC556B
Q13,Q16 = STD03N (+ isolation pad & mounting hardware)
Q12,Q15 = STD03P (+ isolation pad & mounting hardware)
U1,U2,U4 = AD844AN
U3 = TL051CP
Miscellaneous
J9 = header 2 x 1 pin (signal input)
J10 = header 2 x 3 pin (+ flatcable)
4 IC sockets DIL08
PCB, ref. 071085-1
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