Stereo preamplifier with tone controls

It is a pre amplifier and audio control unit which will be a useful complement to our circuit amplifier makes. It is extremely easy to build special Philips TDA1524A due to the use of an IC.

Because it uses the control voltage, linear single gang can use pots which lowers costs and reduces Fehler.Es monitoring of switches control or microprocessor, if desired.

Specification:

DC input: 15V DC Versorgung or 12V
DC battery.50 mA min
Maximum output power: 3 V RMS
Maximum input power: 300 mV, G = 20 dB 3V RMS, G = 0 DB
Entry Z 10 k ohms
Z 300 OHM output frequency or: 50 kHz + /-1 dB
THD 1 kHz: 0.1% to 1 v output signal noise ratio: 80 dB, G = 0 dB
Bass boost/cut ~ 15 dB at 50 Hz
Triple inch cut blow ~ 15 dB at 15 kHz



Click here for Datasheet TDA1524A IC - original Audio Kit

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