22 Watt Car Subwoofer Amplifier

Circuit Description

     The stereo signals coming from the line outputs of the car radio amplifier are mixed at the input and, after the Level Control, the signal enters the buffer IC1A and can be phase reversed by means of SW1. This control can be useful to allow the subwoofer to be in phase with the loudspeakers of the existing car radio. Then, a 12dB/octave variable frequency Low Pass filter built around IC1B, Q1 and related components follows, allowing to adjust precisely the low pass frequency from 70 to 150Hz. Q2, R17 and C9 form a simple dc voltage stabilizer for the input and filter circuitry, useful to avoid positive rail interaction from the power amplifier to low level sections.

     This unit is intended to be connected to an existing car stereo amplifier, adding the often required extra "punch" to the music by driving a subwoofer. As very low frequencies are omnidirectional, a single amplifier is necessary to drive this dedicated loudspeaker. The power amplifier used is a good and cheap BTL (Bridge Tied Load) 13 pin IC made by Philips (now NXP Semiconductors) requiring a very low parts count and capable of delivering about 22W into a 4 Ohm load at the standard car battery voltage of 14.4V.

Circuit Diagram

Parts list:

• P1_____________10K Log Potentiometer
• P2_____________22K Dual gang Linear Potentiometer
• R1,R4___________1K 1/4W Resistors
• R2,R3,R5,R6____10K 1/4W Resistors
• R7,R8_________100K 1/4W Resistors
• R9,R10,R13_____47K 1/4W Resistors
• R11,R12________15K 1/4W Resistors
• R14,R15,R17____47K 1/4W Resistors
• R16_____________6K8 1/4W Resistor
• R18_____________1K5 1/4W Resistor
• C1,C2,C3,C6_____4µ7 25V Electrolytic Capacitors
• C4,C5__________68nF 63V Polyester Capacitors
• C7_____________33nF 63V Polyester Capacitor
• C8,C9_________220µF 25V Electrolytic Capacitors
• C10___________470nF 63V Polyester Capacitor
• C11___________100nF 63V Polyester Capacitor
• C12__________2200µF 25V Electrolytic Capacitor
• D1______________LED any color and type
• Q1,Q2_________BC547 45V 100mA NPN Transistors
• IC1___________TL072 Dual BIFET Op-Amp
• IC2_________TDA1516BQ 24W BTL Car Radio Power Amplifier IC
• SW1____________DPDT toggle or slide Switch
• SW2____________SPST toggle or slide Switch capable of withstanding a current of at least 3A
• J1,J2__________RCA audio input sockets
• SPKR___________4 Ohm Woofer or two 8 Ohm Woofers wired in parallel

Technical data:

• Output power (1KHz sinewave): 22W RMS into 4 Ohms at 14.4V supply
• Sensitivity: 250mV input for full output
• Frequency response: 20Hz to 70Hz -3dB with the cursor of P2 fully rotated towards R12, 20Hz to 150Hz -3dB with the cursor of P2 fully rotated towards R11
• Total harmonic distortion: 17W RMS: 0.5% 22W RMS: 10%

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8W AUDIO AMPLIFIER TDA1908

General Description:

The TDA1908 is a monolithic integrated circuit in 12 lead quad in-line plastic package intended for low frequency power applications.The mounting is compatible with the old types TBA800, TBA810S, TCA830S and TCA940N. Its main features are:

Features:

• flexibility in use with a max output curent of 3A and an operating supply voltage range of 4V to 30V;
• protection against chip overtemperature;
• soft limiting in saturation conditions;
• low ”switch-on” noise;
• low number of external components;
• high supply voltage rejection;

Circuit Diagram

8W AUDIO AMPLIFIER TDA1908

TDA1015 Audio Amplifier 1x4W

TDA1015 general description:

The TDA1015 is a monolithic integrated audio amplifier circuit in a 9-lead single in-line (SIL) plastic package. The device is especially designed for portable radio and recorder applications and delivers up to 4 W in a 4Ω load impedance. The very low applicable supply voltage of 3,6 V permits 6 V spplications.

TDA1015 features:

• single in-line (SIL) construction for easy mounting
• separated preamplifier and power amplifier
• high output power
• thermal protection
• high input impedance
• low current drain
• limited noise behaviour at radio frequencies

TDA1015 reference data:

• Supply voltage range VP 3,6 to 18 V
• Peak output current IOM max. 2,5 A
• Output power at dtot= 10%
• VP = 12 V; RL = 4 Ω Po typ. 4,2 W
• VP = 9 V; RL = 4 Ω Po typ. 2,3 W
• VP = 6 V; RL = 4 Ω Po typ. 1,0 W
• Total harmonic distortion at Po = 1 W; RL = 4 Ω dtot typ. 0,3 %
• Input impedance preamplifier (pin 8) |Zi | > 100 kΩ power amplifier (pin 6) |Zi| typ. 20 kΩ
• Total quiescent current Itot typ. 14 mA
• Operating ambient temperature Tamb −25 to + 150 °C
• Storage temperature Tstg −55 to + 150 °C

TDA1015 circuit diagram:

Circuit diagram TDA1015 Audio Amplifier 1x4W

TDA2005 Audio Amplifier 2x10w

TDA2005 description:

The TDA2005 is a class B dual audio power amplifier in Multiwatt11 package specifically designed for car radio applications. Power booster amplifiers can be easily designed  using this device that provides a high current  capability (up to 3.5 A) and can drive very low  impedance loads (down to 1.6  in stereo  applications) obtaining an output power of more than 20 W (bridge configuration). TDA2005 Audio Amplifier 2x10w

TDA2005 features:

High output power:
Po = 10 + 10 W @ RL = 2 , THD = 10 %
Po = 20 W @ RL = 4 , THD = 10 %.
Protection against:
Output DC and AC short circuit to ground
Overrating chip temperature
Load dump voltage surge
Fortuitous open ground
Very inductive loads
Loudspeaker protection during short circuit for one wire to ground

TDA2005 circuit diagram:

TDA2005 Audio Amplifier 2x10w

TDA2005 layout:

PCB TDA2005 Audio Amplifier 2x10w

Layout TDA2005 Audio Amplifier 2x10w

TDA7338 FM stereo decoder circuit design

The pilot detector output is designed as an open collector output, therefore an external pull up resistor is needed. To force the decoder to `MONO` Pin 19 has to be clamped to a voltage below 0. 8V. visit page.

TDA7338 FM stereo decoder circuit design

12 W Bridge Amplifier circuit diagram

The following schematic shows 12 W Bridge Amplifier circuit diagram as an application of the TDA2007A a class AB dual audio power amplifier which is designed for stereo application in music centers, TV receivers and portable radios. According to the datasheet, this TDA2007A has features such high output power, high current capability, AC short circuit protection, and thermal overload. via next.gr

12 W Bridge Amplifier circuit diagram

4 x 45 W power amplifier

General description

The TDA8593J is a complementary quad BTL audio power amplifier made in BCDMOS technology. It contains four independent amplifiers in Bridge Tied Load (BTL) configuration. Through the I2C-bus, the diagnostic information of each amplifier and speaker can be read separately. Both front and both rear channel amplifiers can be configured independently in line driver mode with a gain of 20 dB.

Features

• I2C-bus control
• Hardware programmable I2C-bus address
• Can drive a 2 Ω load with a battery voltage of up to 16 V and a 4 Ω load with a battery voltage of up to 18 V
• DC-load detection: open, short and present
• AC-load (tweeter) detection
• Programmable clip detection: 1 % or 3 %
• Programmable thermal protection pre-warning
• Independent short-circuit protection per channel
• Low gain line driver mode (20 dB)
• Loss-of-ground and open VP safe
• All outputs protected from short-circuit to ground, to VP, or across the load
• All pins protected from short-circuit to ground
• Soft thermal clipping to prevent audio holes
• Low battery detection.

Circuit Diagram

Circuit diagram for TDA8593

PCB layout of test and application circuit; components bottom

 PCB layout of test and application circuit; copper layer bottom

PCB layout of test and application circuit; components top

 PCB layout of test and application circuit; copper layer top

2 x 32W DUAL BRIDGE CAR RADIO AMPLIFIER TDA7393

Features:

• HIGH OUTPUT POWER CAPABILITY:
• 2 x 35W max./4Ω
• 2 x 32W EIAJ/4Ω
• 2 x 22W typ./4Ω @ 14.4V, 1KHz, 10%
• 2 x 19W typ./4Ω @ 13.2V, 1KHz, 10%
• 2 x 28W typ./2Ω @ 14.4V, 1KHz, 10%
• 2 x 25W typ./2Ω @ 13.2V, 1KHz, 10%
• LOW DISTORTION
• LOW OUTPUT NOISE
• ST-BY FUNCTION
• MUTE FUNCTION
• AUTO-MUTE AT MIN. SUPPLY VOLTAGE
• DETECTION
• LOW EXTERNAL COMPONENT COUNT
• – INTERNALLY FIXED GAIN (32dB)
• – NO EXTERNAL COMPENSATION
• – NO BOOTSTRAP CAPACITORS
• ADDITIONAL MONO INPUT
• OUTPUT AC/DC SHORT CIRCUIT TO GND
• AND TO VS
• VERY INDUCTIVE LOADS
• OVERRATING CHIP TEMPERATURE WITH
• SOFT THERMAL LIMITER

Circuit Diagram:

2 x 32W DUAL BRIDGE CAR RADIO AMPLIFIER

4 x 22W FOUR BRIDGE CHANNELS CAR RADIO AMPLIFIER TDA7382

Circuit Diagram:

4 x 22W FOUR BRIDGE CHANNELS CAR RADIO AMPLIFIER TDA7382

22W BRIDGE / STEREO AUDIO AMPLIFIER WITH CLIPPING DETECTOR TDA7360

General Description:

TDA7360 is a new technology class AB Audio Power Amplifier in the Multiwatt package
designed for car radio applications.

Circuit Diagram

TDA7360 bridge

TDA7360 stereo

14 + 14W STEREO AMPLIFIER WITH MUTE & ST-BY

Features

WIDE SUPPLY VOLTAGE RANGE UP TO
±20V
SPLIT SUPPLY
HIGH OUTPUT POWER
14 + 14W @ THD =10%, RL = 8Ω, VS = +16V
NO POP AT TURN-ON/OFF
MUTE (POP FREE)
STAND-BY FEATURE (LOW Iq)
SHORT CIRCUIT PROTECTION TO GND
THERMAL OVERLOAD PROTECTION

Circuit Diagram:

Circuit diagram for 14 + 14W STEREO AMPLIFIER WITH MUTE & ST-BY

10+10W DUAL BRIDGE AMPLIFIER TDA7266B

Features

• WIDE SUPPLY VOLTAGE RANGE (6V -18V)
• MINIMUM EXTERNAL COMPONENTS
• NO SVR CAPACITOR
• NO BOOTSTRAP
• NO BOUCHEROT CELLS
• INTERNALLY FIXED GAIN
• STAND-BY & MUTE FUNCTIONS
• SHORT CIRCUIT PROTECTION
• THERMAL OVERLOAD PROTECTION

DESCRIPTION

The TDA7266B is a dual bridge amplifier specially designed for TV and Portable Radio applications

Circuit Diagram

Circuit Diagram 10+10W DUAL BRIDGE AMPLIFIER

Layout

7+7W DUAL BRIDGE AMPLIFIER

Features:

• WIDE SUPPLY VOLTAGE RANGE (3-18V)
• MINIMUM EXTERNAL COMPONENTS
• NO SWR CAPACITOR
• NO BOOTSTRAP
• NO BOUCHEROT CELLS
• INTERNALLY FIXED GAIN
• STAND-BY & MUTE FUNCTIONS
• SHORT CIRCUIT PROTECTION
• THERMAL OVERLOAD PROTECTIO

Circuit Diagram:

TDA7266 layout

Circuit Diagram 7+7W DUAL BRIDGE AMPLIFIER

25 + 25W STEREO AMPLIFIER WITH MUTE/ST-BY

Features

• WIDE SUPPLY VOLTAGE RANGE (UP TO 50V ABS MAX.)
• SPLIT SUPPLY
• HIGH OUTPUT POWER: 25 + 25W @ THD =10%, RL = 8Ω, VS = +20V
• NO POP AT TURN-ON/OFF
• MUTE (POP FREE)
• STAND-BY FEATURE (LOW IQ)
• FEW EXTERNAL COMPONENTS
• SHORT CIRCUIT PROTECTION
• THERMAL OVERLOAD PROTECTION

Circuit Diagram

25 + 25W STEREO AMPLIFIER WITH MUTE/ST-BY

Layout:

PCB layout

12 +12W STEREO AMPLIFIER WITH MUTING

12 +12W STEREO AMPLIFIER WITH MUTING

20+20W STEREO AMPLIFIER WITH STAND-BY

Circuit diagram TDA7262 20+20W STEREO AMPLIFIER WITH STAND-BY

8W AMPLIFIER WITH MUTING

Features:

WIDE SUPPLY VOLTAGE RANGE
8W @ VS=26V, RL = 8Ω, THD=10%
MUTE FACILITY (POP FREE) WITH LOW
CONSUMPTION
AC SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
(150°C)

DESCRIPTION

The TDA7253 is class AB audio power amplifier assembled in the new Clipwatt package.

Circuit Diagram:

Circuit Diagram for 8W AMPLIFIER WITH MUTING

60 W HI-FI DUAL AUDIO DRIVER

Features:

• WIDESUPPLY VOLTAGE RANGE : 20 TO 90 V (± 10 to ± 45 V)
• VERY LOW DISTORTION
• AUTOMATIC QUIESCENT CURRENT
• CONTROL FOR THE POWER TRANSISTORS WITHOUT TEMPERATURE 
• SENSE ELEMENTS
• OVERLOAD CURRENT PROTECTION FOR
• THE POWER TRANSISTORS
• MUTE/STAND-BY FUNCTIONS
• LOW POWER CONSUMPTION
• OUTPUT POWER 60 W/8 Ω AND 100 W/4 Ω

DESCRIPTION:

The TDA7250 stereo audio driver is designed to drive two pair of complementary output transistor in the Hi-Fi power amplifiers.

Circuit Diagram:

Circuit diagram for 60 W HI-FI DUAL AUDIO DRIVER

5W AUDIO AMPLIFIER WITH MUTING AND STAND-BY TDA7245

Features

• MUTING AND STAND-BY FUNCTIONS
• VOLTAGE RANGE UP TO 30V
• HIGH SUPPLY VOLTAGE REJECTION
• SVR TYP = 50dB (f = 100Hz)
• MUSIC POWER = 12W (RL = 4Ω, d = 10%)
• PROTECTION AGAINST CHIP OVER
• TEMPERATURE

General Description

The TDA7245 is a monolithic integrated circuit in 9+9 POWERDIP package, intended for use as low frequency power amplifier in a wide range of applications in radio and TV sets

Circuit Diagram

Circuit diagram for 5W AUDIO AMPLIFIER

Low voltage mono/stereo power amplifier

GENERAL DESCRIPTION

The TDA7050T is a low voltage audio amplifier for small radios with headphones (such as watch, pen and pocket radios) in mono (bridge-tied load) or stereo applications.

Features

• Limited to battery supply application only (typ. 3 and 4 V)
• Operates with supply voltage down to 1,6 V
• No external components required
• Very low quiescent current
• Fixed integrated gain of 26 dB, floating differential input
• Flexibility in use − mono BTL as well as stereo
• Small dimension of encapsulation (see package design example).

Circuit Diagram

Circuit diagram Low voltage mono/stereo power amplifier