Here is a stereo preamplifier circuit with built in tone control facility. A very useful circuit using versatile tone control IC TDA 1524 from Phillips.
This circuit is designed as per the data sheet as an effective stereo-tone & volume control for car stereos , TV sets or any sort of stereo amplifier circuit you want.The circuit includes provisions like bass control, treble control , volume control with inbuilt contour or linear mode option (can be switched in betwwen) and balance. All these functions provided can be controlled by DC voltages or by linear potentiometers.
Note:
- R1 ,R2 ,R3 andR4 can be used for controlling volume, balance, treble and bass respectively.
- If SPDT switch S1 is in position 1 ,the circuit works in contour mode and in position 2 the circuit works in linear mode.
- If you are using a 15-20V supply, you can use that as your pre-amp supply as well. Make sure you test the voltage first in all cases
TDA1524 Tone Control Component:
R1,R2 : 220R Resistor
R3,R4 : 4K7 Resistor
R5 : 2K2 Resistor
R6 : 1K Resistor
C1,C2,C7,C8,C17 : 10 uF ecap
C3,C4 : 47 nF
C5,C6 : 15 nF
C9 : 220 nF poly
C10 : 100 uF 25V
C11,C12,C13,C14,C16 : 100 nF
C15 : 1000 uF 35V
C18,C19 : 10 nF
IC1 : TDA 1524A
IC2 : LM 7812
P1 : 50k linear switch pot
P2,P3,P4 : 50k linear pot
X1,X2,X3,X4 : RCA jack
D1 : Diode 1N4004
L1 : Red LED