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The Velleman K4303 Power Supply and Switching Module Kit consists of 2 parts :
1. Power supply and connection module (on the back panel). This consists of : power supply for all models (transformer 2 x 12Vac / 1A not included ; equaliser connections : EQUALISER IN - EQUALISER OUT - TAPE OUT.
2. Switching module for all functions of the spectrum analyser and the equaliser. This consists of : mains switch ON / OFF + LED indicator ; Equaliser input PINK NOISE/LINE ; Tape output : LINE/EQUALISER ; Analyser input : LINE/EQUALISER ; Level control for the spectrum analyser.