Article
Switchbox for Loudspeakers/Amplifiers
Anyone who has ever taken part in a listening test with various loudspeaker systems and amplifiers knows that the differences are often very subtle and difficult to judge. To make a good comparison it is absolutely necessary that changes from one combination to another can be made quickly. The adjacent circuit will be a welcome aid in these cases. It is specifically intended to switch between four amplifiers or loudspeakers. Also, when using the ‘Simple Remote Control’ described elsewhere in this issue it is not even necessary to leave your listening position.
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.
Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
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PCB
Component list
Resistors:
R1,R3,R5,R7 = 3kOhm 3
R2,R4,R6,R8 = 1kOhm 5
R9 = 5kOhm 6
Capacitors:
C1 = 470µF 40V radial
Semiconductors:
B1,B2 = B80C1500, round case (80V piv, 1.5A peak)
D1-D4 = 1N4148
D5 = LED, high-efficiency
T1-T4 = BC547B
Miscellaneous:
Re1-Re4 = G2R-1-E-24VDC Omron (Conrad Electronics)
K1,K2 = 2-way PCB terminal block, lead pitch 7.5mm
Tr1 = 2 x 15 V/1VA5, e.g. Hahn type BV EI 302 2028
5 off spade terminal, screw mounting (3mm screw)
R1,R3,R5,R7 = 3kOhm 3
R2,R4,R6,R8 = 1kOhm 5
R9 = 5kOhm 6
Capacitors:
C1 = 470µF 40V radial
Semiconductors:
B1,B2 = B80C1500, round case (80V piv, 1.5A peak)
D1-D4 = 1N4148
D5 = LED, high-efficiency
T1-T4 = BC547B
Miscellaneous:
Re1-Re4 = G2R-1-E-24VDC Omron (Conrad Electronics)
K1,K2 = 2-way PCB terminal block, lead pitch 7.5mm
Tr1 = 2 x 15 V/1VA5, e.g. Hahn type BV EI 302 2028
5 off spade terminal, screw mounting (3mm screw)
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