• on Audio/Video/Photography
  • Published in issue 7/2001 on page 0
About the article

Switchbox for Loudspeakers/Amplifiers

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.
Downloading of this magazine article is reserved for Elektor Members only.
Already a member? click here to log in.
Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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 its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1,R3,R5,R7 = 3kOhm 3
R2,R4,R6,R8 = 1kOhm 5
R9 = 5kOhm 6
C1 = 470µF 40V radial
B1,B2 = B80C1500, round case (80V piv, 1.5A peak)
D1-D4 = 1N4148
D5 = LED, high-efficiency
T1-T4 = BC547B
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)
Loading comments...