Protection system for power amplifiers
An indispensable companion for the paX amplifier
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Component list
Resistors
(0.25W metal film)
R1 = 10kΩ
R4,R9 = 12Ω
R5,R12 = 9kΩ1
R6,R13 = 6kΩ19
R7,R11 = 2kΩ0
R8,R10 = 536Ω
R14,R15 = 270Ω
R16,R22 = 3kΩ9
R17 = 36kΩ
R18 = 523Ω
R19 = 16kΩ
R20 = 56kΩ
R21 = 18kΩ
R24,R25 = 22kΩ
R23 = 3.9kΩ 1W
Capacitors
C1,C2 = 100nF ceramic
C3 = 330µF 6.3V
C4 = 22nF ceramic
C5 = 33µF 10V
C6 = 4.7 µF 25V
Semiconductors
D1,D6-D11 = 1N4148
D2,D5 = zener diode 18V 0.5W
D3,D4 = zener diode 12V 0.5W
J2 = Dual color LED
Q1 = 2SC2910
Q2 = 2SA1208
Q3 = BC546B
Q4 = BC556B
U1 = MCT6 (Fairchild)
U2 = UPC1237 (NEC) or NTE7100 (NTE Electronics)
Miscellaneous
J6 = header 2 x 1 pin
J7 = 2 x 3 pin DIL flatcable header
RL1 = Amplimo LS relay
DIL socket 2 x 4
SIL socket 1 x 8 pin
PCB, order code 071086-1
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