This is the circuit diagram of stereo preamplifier which built based a compact IC TDA1524A. Tone control circuit module is included in this preamplifier circuit, so you can connect the output channels directly to stereo power audio amplifier circuit.
Components List
R1, R2 = 220R R3, R4 = 4K7 R5 = 2K2 R6 = 1K C1, 2, 7, 8, 17 = 10uF/25V C3, 4 = 47nF C5, 6 = 15nF C9 = 220nF C10 = 100uF/25V |
C11, 12, 13, 14, 16 = 100nF C15 = 1000uF/35V C18, 19 = 10nF IC1 = TDA1524A IC2 = LM7812 P1 = 50k linear switch pot P2, 3, 4 = 50k linear pot D1 = Diode 1N4004 L1 = LED |
Circuit Features:
- Simple construction
- Few external components
- Low noise and distortion
- Switchable loudness
- Will drive most power amplifier
Pre-amplifier Specifications:
- D.C. Input : 15V DC supply or 12V battery at 50 mA.
- Gain 20 dB max.
- Maximum output : > 3 V RMS
- Maximum input : > 300 mV, G = 20 dB ; > 3V RMS, G = 0dB
- Input: Z > 10 k ohm
- Output: Z < 300 ohm
- Frequency resp. : < 10 Hz to > 50 kHz ; + / – 1 dB
- THD at 1kHz : < 0.1 % at 1V output
- S/N ratio : > 85 dB, G = 0 dB
- Bass boost/cut ~ 15 dB at 50 Hz
- Treble boost/cut ~ 15 dB at 15 kHz
Download the application notes of this stereo preamplifier circuit here
Download the TDA1524A datasheet here