Universal I/O for Power Amps

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Published in issue 345, July 2005

Resistors:

R1 = 270k

R2 = 1k2

R3,R4 = 1M

P1 = 250k preset

Capacitors:

C1 = 4µF7 MKT or MKP (see text)

C2 = 47nF

C3 = 10µF 63V radial

Semiconductors:

D1,D3 = 1N4148

D2 = zener diode 24V 1.3W

D4 = 1N4002

T1 = BS170

Miscellaneous:

K1 = cinch socket, PCB mount, e.g. Monacor / Monarch T-709G

K2, K3 = spade terminal, PCB mount, vertical, 2 pins

RE1 = PCB relay 24 V/16 A (e.g., Omron G2R-1-24, 1100 Ohm, or Schrack RT314024, 1440 Ohm)

PCB, ref. 054010-1