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Now downloading free:PassLabs AlephL

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

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File name:PassLabs-AlephL preamp.pdf
[preview AlephL]
Size:592 kB
Model:AlephL 🔎
Group:Electronics > Consumer electronics > Audio >
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PassLabs-AlephL preamp.pdfPass Laboratories Aleph L Service Manual The Aleph L is a simple Mosfet stereo preamplifier having four single-ended inputs and two outputs. Its controls consist of an input selector and a level control. Maximum gain is internally adjustable via a dip switch. The gain stage of the preamp is a single Mosfet operated common source and biased by a Mosfet constant current source. Figure 1 shows the schematic of the preamp, indicating the component designations and values and various voltages. The power supply and the left channel are shown. Power supply and components common to both channels have reference designators less than 100. The left channel is 100 to 199, and the right channel is 200 to 299. The power supply transformer delivers approximately 84 volts (for 120 or 240 VAC operation) unregulated DC into C1, which is then passively filtered and then actively regulated down to about 60 volts at the output of Q1. Q1 is driven by a stack of Zener diodes in parallel with C3 and the reg

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