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Erschienen in:
2011 | OriginalPaper | Buchkapitel
28. Modules 1–4
verfasst von : Dipl.-Ing. Burkhard Vogel
Erschienen in: The Sound of Silence
Verlag: Springer Berlin Heidelberg
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Abstract
The detailed circuit diagrams of the Module 1 phono-amp section are shown in Figs. 15.3a–b and the respective – in-case – power supply unit circuit diagram is shown in Fig. 15.3c. I guess these diagrams are self-explanatory. Figure 27.1 shows the wiring of the input connectors and Fig. 27.2 shows the output stage.
The calibration of the OP4 DC offset setting P3 needs some time because of the rather high time constant of R27, 28 and C25, 26. P6 sets the stage gain at +6dB – or any other gain to get an output voltage as indicated. It makes no sense to further increase the output voltage of Tr1 because of growing distortion. S4 allows a 180° phase change of the balanced output signal. S2 switches the two outputs on/off and R31 + C28 ensure a delayed on-switch of the two outputs when turning the module on. Rel 1–4 are TQ2-12V relays from Matsushita.