Stereo preamplifier with bass boost
This preamp circuit was designed around from CD player, tuner, Tape Recorder, etc., offers 4 AC voltage gain at least sensitive power amplifiers to cope. Fi House modern devices often with small loudspeaker cabinets installed, the low frequency range rather sacrificed. This circuit includes a low amp to overcome this problem. You can use a variable resistance, Bass Boost 0 maximum value + 16 dB @ 30 Hz. If a fixed maximum necessary boost value variable resistance can be omitted and replaced by a switch.
The parts list:
Notes:- Diagram shows left channel only, but R1, R2, R3 and C1, C2, C3, which are common to both channels.
- For stereo operation P1, P2 (SW1), R4, R5, R6, R7, R8, and C4, C5, C6, C7 should be doubled.
- Figures in parentheses indicate PIN for the right IC1 channel connections.
- A protocol for P2 type ensures a more linear regulators of bass boost.
- Need for a simple boost with launch of thumb out - process P2 shall be omitted and SW1 added, as shown in the diagram.
- Bipolar stereo operation must be an SW1 type.
- Please note that the SW1, increasing use is if the switch is open and turning off closing switch.
Source: stereo with bass boost preamplifier
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