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Now downloading free:PassLabs X2

Download PassLabs X2 docs - Audio equipment,digital audio, home audio, professional audio systems service manuals and repair information

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File name:PassLabs-X2 preamp.pdf
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Group:Electronics > Consumer electronics > Audio >
Uploaded:2010-01-25 19:31:27
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PassLabs-X2 preamp.pdfPASS X2 SERVICE MANUAL REV 0,1 PASS LABORATORIES 24449 FORESTHILL RD. FORESTHILL, CA 95631 TEL (530) 367-3690 FAX (530) 367-2193 The Pass Labs X2 is a high performance audio preamplifier, intended for maximum performance in reproduction of music. It is a simple design, having only a single balanced gain stages consisting of balanced pairs of power Mosfets biased by a constant current sources. Figure 1 shows the block diagram of one channel of the preamplifier. There are three unbalanced inputs and one balanced input. The balanced input is converted to single-ended via a differential amplifier. The signal from all four inputs is presented to the Select and Tape Mon switches. The wiper of the Select switch attaches to the input volume control, and its wiper feeds one input of a balanced gain stage. The output of the balanced gain stage is the output of the preamp. Fig. 2 shows the schematic of the balanced input circuit. Mosfets Q101 and Q102 form a differential pair

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