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A Passive
Line Stage Schematic
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The passive preamp schematic
below includes a "Mode Switch" which allows the
signal selected by the Source
(selector switch) to go directly to recording output
RCA jacks (position 1 only). |
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The Source selection goes
to the volume control (LEVEL) and on to the Main Outputs
if the Mode Switch is in
position 1 or 3. You can listen to the selection while recording it
with position 1 od the Mode
Switch selected. However, If you set the Mode Switch to position 3, you
can still listen to the Source selection, but the recording output is
disconnected. |
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Then the Mode Switch is
set to position 2, you have Mute, with both the Main Output and the Recording
Output disconnected. |
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Another interesting feature
is the Grounding Switch, which is shown as a Double Pole, Double Throw,
Center OFF toggle switch. In the Center OFF position, the grounds from
each channel (Left and Right)
are isolated from each other. Flipping the toggle switch up causes the
two grounds to be connected to each other. Flipping it downward causes
both grounds to be connected to each other AND connects them both to the
chassis (assuming that a metal chassis is used to house this passive line
stage preamp.) |
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Source Selector Switch (2
pole, 6 position) is Goldpoint P/N 2P-6T-1D
Mode Switch (4 pole, 3 position)
is Goldpoint P/N 4P-3T-1D |
