Circuit Stereo Preamplifier With IC TDA1524A – Tone Control Unit

Circuit Stereo Preamplifier With IC TDA1524A – Tone Control Unit

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Circuit Stereo Preamplifier With IC TDA1524A - Tone Control Unit - bass treble control, channel balance, and loudness contour

Stereo preamplifier circuit based on the Integrated Circuit TDA1524A. Contains components for amplification and pre Tone controlling. The signal processing is done by the voltage controlled TDA1524A. This manufactured by Philips IC (NXP) Semiconductors, allows for tone control voltage and can be used in more complex designs using microcontrollers. Here we use linear potentiometers to control tone, volume and balance. The circuit is completed with the source and the suggestion of the printed circuit board, to facilitate assembly. Ideal circuit to be complemented by the power amplifier circuit posted here on the blog.

Description of pre tonal circuit with IC TDA1524A Stereo – With adjustment Bass, Treble, Balance,  Volume and Loudness

The circuit TDA 1524 has a 20DB gain and control tone +-15dB, if you prefer to mount it in a DIP socket 18 to facilitate maintenance.

The power supply uses a transformer 12V/250mA to regulate the voltage at 12 volts using a IC 7812T (any prefix). If using on a project that already has amplifier and a power supply, you can omit the transformer, diodes and replace by the 4700μF capacitor by a 470 or 1000μF . The LED used to indicate the active state of the circuit can also be omitted if you prefer.

S1 in the connector is to be connected to key loudness, and works well with the key turned to the R2 circuit is disabled, if you want to use this feature, simply connect a jumper in place so that the resistor R2 (2.2K) stay connected to the circuit.

Schematic of the preamplifier with tone control and Volume

Schematic of the preamplifier with tone control and Volume

Suggested of the printed circuit board for mounting the pre-tone with IC TDA 1524 – Adjusted Bass, Treble, Balance and Volume

Suggested of the printed circuit board for mounting the pre-tone with IC TDA 1524 - Adjusted Bass, Treble, Balance and Volume
PCB Copper side
Suggested of the printed circuit board for mounting the pre-tone with IC TDA 1524 - Adjusted Bass, Treble, Balance and Volume
PCB Component side
Suggested of the printed circuit board for mounting the pre-tone with IC TDA 1524 - Adjusted Bass, Treble, Balance and Volume
Silk screen component

List of components for assembly circuit TDA1524A tone control with Bass and Treble

Parts Value
Resistor’s 1/4 Watt 5%
R1 1.2K – Brown, Red, Red, Gold
R2 2.2K – Red, Red, Red, Gold
R3, R4 4.7K – Yellow, Violet, Red, Gold
R5, R6 220 – Red, Red, brown, gold
Capacitors
C1 4700µF/35V – Electrolytic Capacitor
C2, C4, C5, C6, C7, C8, C20 100nF – Polyester Capacitor
C3, C13, C14, C15, C16 10µF/25V – Electrolytic Capacitor
C9, C17 47nF – Polyester Capacitor
C10,C18 15nF – Polyester Capacitor
C11, C12 10nF – Polyester Capacitor
C19 100µF/25V – Electrolytic Capacitor
Semiconductors
D1, D2, D3, D4 1N4004 or equivalent – rectifier diode
IC1 7812T – Positive voltage regulator 15 Volts
IC2 TDA1524A – Integrated circuit with volume and tone control Philips (NXP) Semiconductors
LED Red LED
Miscellaneous
IN Input Connector Stereo Audio
AC Connector to the transformer
OUT Connector for Stereo Audio Output
J1 J12MM – Jumper 12 mm piece of wire.
Trafo Transformer 12 Volt
P1, P2, P3, P4 50K or 47K Linear Pot-
S1 Switch for Loudness
Welding, Wire, Cash for housing circuit, printed circuit board, the IC socket, fuse, etc..

Download PDF files for this project: PCB, Silk, Layout, Layout components, Datasheet TDA1524A, TDA1524A Eagle Library.

Download PDF

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Buy TDA1524A IC from Aliexpress

Users electronic tags:

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19 COMMENTS

  1. This is exactly the kit I was looking for.
    I used a stereo transmitter out of a second hand
    Sennheiser cordless headset and the receiver out of the headset in a small plastic cabinet included a 2 x 5 watt
    amp and 2 coomunication-speakers for my almost deff
    father. Now he can hear the television without problems
    with our neighbours. He sits in between the speakers.
    But I had to make a volume control connected by a cable
    of about 4 meters. A voltage-controlled pre-amp is then
    the solution to avoid hum.
    But where to buy the kit???
    I already downloaded the layouts ans I have the parts here.
    But I am not able to make the print.Who can and will help me . Just the print will do. I can drill the holes.
    I saw an shop in South Africa but the charce 40 dollar ans 9 for postage. Here in holland is no shop who sells the kit
    even not in Germany. Please help me.
    Cor den Hollander
    Rotterdam Holland

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