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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Car subwoofer filter circuit

Circuit description:

Here is the circuit diagram of a simple subwoofer filter that can be operated from a 12V DC supply. Such a circuit is very useful in automobile subwoofer applications. The circuit is nothing but a low pass filter whose pass frequency can be adjusted between 60 to 160 Hz. The circuit is designed around the TL072 dual BIFET opamp IC. Out of the two opamps inside the chip, IC1A is wired as a buffer. The left and right audio inputs after mixing is fed to the input of the IC1A using the DPDT switch S1. Switch S1 is the phase control switch which can be used to make the subwoofer in phase with other speakers. When S1 is in position 2, 180 degree phase shift will be induced.POT R7 can be used for controlling the level. IC1B forms the low pass filter whose pass frequency can be controlled by adjusting the dual gang POT R13.

Circuit Features:

• The circuit can be powered from 12V DC.
• IC1 must be mounted on a holder.
• S1 is a DPDT switch.
• R13 should be a dual gang linear POT.
• C5 and C6 must be polyester capacitors.
• POT R13 can be used for adjusting the pass frequency.
• POT R7 can be used for adjusting the level.

Circuit diagram:

Car subwoofer filter

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LM1875 AUDIO AMPLIFIER 20W

LM1875 general description:

LM1875 pcb layout

The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. The LM1875 delivers 20 watts into a 4Ω or 8Ω load on ±25V supplies. Using an 8Ω load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown.The LM1875 design takes advantage of advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding features include high gain, fast slew rate and a wide power bandwidth, large output voltage swing, high current capability, and a very wide supply range. The amplifier is internally compensated and stable for gains of 10 or greater.

LM1875 amplifier circuit:

LM1875 AUDIO AMPLIFIER 20W

LM1875 power supply diagram:

LM1875 power supply diagram

LM1875 pcb layout:

LM1875 pcb layout

LM1875 project review:

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LX1720 Audio Amplifier 2x20W

LX1720 general description:

The LX1720 controller IC contains the necessary functions to implement a stereo Class-D audio amplifier. A Class-D amplifier is a "switching" amplifier that converts a low-level, analog, audio input signal into a highpower, pulse-width modulated (PWM) output. The switching frequency is much higher than the audio band which allows high frequency out-of-band components to be removed with a simple LC filter. The LX1720 generates a PWM output by controlling external MOSFET's connected in a full-bridge configuration. Because the MOSFET's are either full "on" or full "off", their power dissipation is minimal allowing maximum power to be delivered to the speaker.

LX1720 Circuit:

LX1720 Audio Amplifier 2x20W

TDA8922 Audio Amplifier 2x25W

TDA8922 general description:

The TDA8922 is a high efficiency class-D audio power amplifier with very low dissipation. The typical output power is 2 × 25 W. The device is available in the HSOP24 power package with a small internal heatsink and in the DBS23P through-hole power package. Depending on the supply voltage and load conditions, a very small or even no external heatsink is required. The amplifier operates over a wide supply voltage range from ±12.5 to ±30 V and consumes a very low quiescent current.

TDA8922 features:

• High efficiency (∼90%)
• Operating supply voltage from ±12.5 to ±30 V
• Very low quiescent current
• Low distortion
• Usable as a stereo Single-Ended (SE) amplifier or as amono amplifier in Bridge-Tied Load (BTL)
• Fixed gain of 30 dB in Single-Ended (SE) and 36 dB in
• Bridge-Tied Load (BTL)
• High output power
• Good ripple rejection
• Internal switching frequency can be overruled by an external clock
• No switch-on or switch-off plop noise
• Short-circuit proof across load and to supply lines
• Electrostatic discharge protection
• Thermally protected.

TDA8922 applications:

• Television sets
• Home-sound sets
• Multimedia systems
• All mains fed audio systems
• Car audio (boosters).

TDA8922 amplifier diagram, circuit:

TDA8922 pcb layout:

TDA7490 Audio Amplifier 2x25W

TDA7490 general description:

The TDA7490 is a dual audio class D amplifier assembled in Flexiwatt 25 package; it is specially designed for high efficiency application mainly for TV and Home Stereo sets.

TDA7490 features: 

• 25W + 25W OUTPUT POWER:
• RL = 8Ω/4Ω; THD = 10%
• HIGH EFFICIENCY
• WIDE SUPPLY VOLTAGE RANGE (FROM
• ±10 TO ±25V)
• SPLIT SUPPLY
• TURN OFF/ON POP FREE
• ST-BY AND MUTE FEATURES
• SHORT CIRCUIT PROTECTION ACROSS
• THE LOAD
• THERMAL OVERLOAD PROTECTION
• EXTERNALLY SINCHRONIZABLE
• BRIDGE CONFIGURATION

TDA7490 amplifier diagram, circuits:

TDA7490 Audio Amplifier 2x25W

TDA7490 layout, pcb:

TDA7490 layout, pcb

TDA7490 layout, pcb

45 Watt Class B Amplifier

45 Watt Class B Amplifier Description

45W into 8 Ohm - 69W into 4 Ohm Easy to build - No setup required

45 Watt Class B Amplifier

45 Watt Class B Amplifier Description

The main design targets for this amplifier were as follows:

• Output power in the 40 - 70W range
• Simple circuitry
• Easy to locate, low cost components
• Rugged performance
• No setup

These goals were achieved by using a discrete-components op-amp driving a BJT complementary common-emitter output stage into Class B operation. In this way, for small output currents, the output transistors are turned off, and the op-amp provides all of the output current. At higher output currents, the power transistors conduct, and the contribution of the op-amp is limited to approximately 0.7/R11. The quiescent current of the op-amp biases the external transistors, and hence greatly reduces the range of crossover.

The idea sprang up from a letter published on Wireless World, December 1982, page 65 written by N. M. Allinson, then at the University of Keele, Staffordshire.
In this letter, op-amp ICs were intended as drivers but, as supply voltages up to +/- 35V are required for an amplifier of about 50W, the use of an op-amp made of discrete-components was then considered and the choice proved rewarding.

The discrete-components op-amp is based on a Douglas Self design. Nevertheless, his circuit featured quite obviously a Class A output stage. As for proper operation of this amplifier a Class B output stage op-amp is required, the original circuit was modified accordingly.

Using a mains transformer with a secondary winding rated at the common value of 25 + 25V (or 24 + 24V) and 100/120VA power, two amplifiers can be driven at 45W and 69W output power into 8 and 4 Ohms respectively, with very low distortion (less than 0.01% @ 1kHz and 20W into 8 Ohms).

This simple, straightforward but rugged circuit, though intended for any high quality audio application and, above all, to complete the recently started series of articles forming the Modular Preamplifier Control Center, is also well suited to make a very good Guitar or Bass amplifier. Enjoy!
Notes:
2N3055 and MJ2955 transistors were listed for Q8 and Q9 as the preferred types, but many different output transistors can be used satisfactorily: TIP3055/TIP2955, TIP35/TIP36, MJ802/MJ4502 amongst others.
Discrete op-amp output transistors Q6 and Q7 do not require any heatsink as their cases remain at ambient temperature. Power transistors Q8 and Q9 should be mounted on a black, finned heatsink as usual.

Parts:

R1______________18K  1/4W Resistor
R2_______________3K9 1/4W Resistor
R3,R6____________1K  1/4W Resistors
R4_______________2K2 1/4W Resistor
R5______________15K  1/4W Resistor
R7______________22K  1/4W Resistor
R8_____________330R  1/4W Resistor
R9,R10__________10R  1/4W Resistors
R11,R12_________47R  1/4W Resistors
R13_____________10R    1W Resistor


C1_______________1µF  63V Polyester Capacitor
C2_____________470pF  63V Polystyrene or Ceramic Capacitor
C3______________47µF  25V Electrolytic Capacitor
C4______________15pF  63V Polystyrene or Ceramic Capacitor
C5_____________220nF 100V Polyester Capacitor
C6_____________100nF  63V Polyester Capacitor

D1,D2,D3,D4___1N4148  75V 150mA Diodes

Q1,Q2________BC560C   45V 100mA Low noise High gain PNP Transistors
Q3,Q4________BC556    65V 100mA PNP Transistors
Q5___________BC546    65V 100mA NPN Transistor
Q6___________BD139    80V 1.5A NPN Transistor
Q7___________BD140    80V 1.5A PNP Transistor
Q8__________MJ2955    60V 15A PNP Transistor
Q9__________2N3055    60V 15A NPN Transistor

STK4221 Audio Amplifier 2x80w

STK4221 general description:

The STK4221II IC from SANYO is a dual high power amplifier chip, preferably suited for compact high power audio applications, for example in cars and luxury transport vehicle audio systems. The chip provides a hassle free stereo output through a single package and a hand full of few external components, making the construction of this circuit rather easy and straightforward. However since the idea presented here does not include a CD or a memory card driver circuit, the input may be derived from readymade audio sources like an ipod, CD walkman, cellphone etc. The circuit discussed here is intended specifically for car audio applications and provides a simple alternative for 

making a 100 watt car stereo amplifier circuit. The diagram may be understood with the following points: An RC network formed by R5, R6 and C3, C4 together helps to reduce and filter stray frequency interferences and is therefore included at the input of the amplifiers. Capacitors C5 and C6 are the coupling capacitors used for blocking DC. The values of these capacitors are chosen such that it does not introduce high reactance levels at low frequencies. This particularly helps to reduce the influence of the input interference noises over the signal source resistance. The value of these capacitors may also be optimized for reducing the “pop” noise when power is switched ON.

STK4221 features:

• Quiescent current ICCO VCC = ±54V 20 40 100 mA
• Output power POTHD = 0.4%, f = 20Hz to 20kHz 80 W
• Total harmonic distortion THD PO = 1.0W, f = 1kHz 0.3 %
• Frequency response fL, fH PO = 1.0W, dB 20 to 50k Hz
• Input impedance ri PO = 1.0W, f = 1kHz 55 kΩ
• Output noise voltage VNO VCC = ±54V, Rg = 10kΩ 1.2 mVrms
• Neutral voltage VN VCC = ±54V -70 0 +70 mV
• Muting voltage VM -2 -5 -10 V

STK4221 circuit diagram: 

STK4221 Audio Amplifier 2x80w

STK4221 pcb layout:

STK4221 Audio Amplifier 2x80w

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

TDA7490 Audio Amplifier 2 x 25W / 1 x 50W

TDA7490 general description:

The TDA7490 is a dual audio class D amplifier assembled in Flexiwatt 25 package; it is specially designed for high efficiency application mainly for TV and Home Stereo sets.  TDA7490 Audio Amplifier 2 x 25W / 1 x 50W

TDA7490 features:

• 25W + 25W OUTPUT POWER:
• RL = 8Ω/4Ω; THD = 10%
• HIGH EFFICIENCY
• WIDE SUPPLY VOLTAGE RANGE (FROM
• ±10 TO ±25V)
• SPLIT SUPPLY
• TURN OFF/ON POP FREE
• ST-BY AND MUTE FEATURES
• SHORT CIRCUIT PROTECTION ACROSS
• THE LOAD
• THERMAL OVERLOAD PROTECTION
• EXTERNALLY SINCHRONIZABLE
• BRIDGE CONFIGURATION

TDA7490 sterio circuit diagram:

TDA7490 Audio Amplifier 2 x 25W / 1 x 50W circuit diagram

TDA7490 mono circuit diagram:

TDA7490 Audio Amplifier 2 x 25W / 1 x 50W mono circuit diagram

TDA7490 sterio circuit pcb:

TDA 7490 pcb layout 

TDA1562Q Audio Amplifier 50W

 TDA1562Q general description:

Philips designers have further improved a number of properties of the IC, among which the power output. According to the Philips datasheet, the improved device, the TDA1562Q, can deliver 70 watts into 4 ohms, but that is at the cost of the distortion, which at 10 per cent is rather too high, even for in a car. The prototype of the design described in this article provides 54 watts into 4 ohms at 1 per cent distortion. Since the number of requisite external components is smaller than in the case of the earlier device, the printed-circuit board is even more compact than that for the February 1995 amplifier.

 TDA1562Q features:

• Low power dissipation during reproduction of music signals
• Proof against short-circuits
• Protection against excessive temperatures
• Standby switch
• No power-on or power-off clicks
• Visible error indication
• Measurement results (at Ub=14.4 V)
• Supply voltage 8–18 V
• Sensitivity 760 mV r.m.s.
• Input impedance 70 kΩ
• Power output 54 W r.m.s. into 4 Ω (f=1 kHz; THD+N=1%)
• Harmonic distortion (THD+) at 1 W into 4 Ω: 0.046% (1 kHz)0.29% 20Hz) at 35 W into 4 Ω: 0.12% (1 kHz) 0.7% (20 kHz)
• Signal-to-noise ratio (with 1 W into 4 Ω) 88 dBA
• Power bandwidth 7.5 Hz – 185 kHz (at 25 W into 4 Ω)
• Quiescent current about 135 mA (‘on’)

TDA1562Q applications:

• Television sets
• Home-sound sets
• Multimedia systems
• All mains fed audio systems
• Car audio (boosters).

TDA1562Q amplifer diagram:

TDA1562Q pcb:

TDA1562Q part lists:

• R1= 1MΩ
• R2 = 4kΩ7
• R3 = 1kΩ
• R4 = 100kΩ
• Capacitors:
• C1,C2 = 470nF
• C3,C4 = 10µF 63V radial
• C5,C6,C8 = 4700µF 25V radial
• (18mm max. dia., raster 7.5 mm)
• C7 = 100nF, raster 5 mm
• Semiconductors:
• D1 = high-efficiency-LED
• IC1 = TDA1562Q (Philips)
• Miscellaneous:
• S1 = single-pole on/off switch
• Four spade connectors, PCB mount
• Heatsink for IC1 (Rth<2.5 K/W)
• PCB, order code 000004-1 (see Readers Services pages)

TDA7560 Audio Amplifier 4x50W

TDA7560 general description:

TDA7560 is a 4 x 45W QUAD BRIDGE car audio amplifier plus HSD. The TDA7560’s inputs are ground-compatible and can stand very high input signals (± 8Vpk) without any performances degradation. If the standard value for the input capacitors (0.1mF) is adopted, the low frequency cut-off will amount to 16 Hz. The TDA7560 is a breakthrough BCD (Bipolar / CMOS / DMOS) technology class AB Audio Power Amplifierin Flexiwatt 25 package designed for high power car radio. The fully complementary P-Channel/N-Channel output structure allows a rail to rail output voltage swing which, combined with high output current and minimised saturation losses sets new power references in the car-radio field, with unparalleled distortion performances.

TDA7560 features:

• 4 x 50W/4W MAX.
• 4 x 45W/4W EIAJ
• 4 x 30W/4W @ 14.4V, 1KHz, 10%
• 4 x 80W/2W MAX.
• 4 x 77W/2W EIAJ
• 4 x 55W/2W @ 14.4V, 1KHz, 10%
• EXCELLENT 2W DRIVING CAPABILITY
• HI-FI CLASS DISTORTION
• LOW OUTPUT NOISE

TDA7560 amplifier circuit diagram:

TDA7560 Audio Amplifier 4x50W

TDA7560 layout:

pcb layout for TDA7560 Audio Amplifier 4x50W

pcb layout TDA7560 Audio Amplifier 4x50W

TDA8922 Audio Amplifier 2 x 25W

TDA8922 general description:

The TDA8922 is a high efficiency class-D audio power amplifier with very low dissipation. The typical output power is 2 × 25 W. The device is available in the HSOP24 power package with a small internal heatsink and in the DBS23P through-hole power package. Depending on the supply voltage and load conditions, a very small or even no external heatsink is required. The amplifier operates over a wide supply voltage range from ±12.5 to ±30 V and

consumes a very low quiescent current. TDA8922 Audio Amplifier 2 x 25W

TDA8922 features:

• High efficiency (∼90%)
• Operating supply voltage from ±12.5 to ±30 V
• Very low quiescent current
• Low distortion
• Usable as a stereo Single-Ended (SE) amplifier or as a mono amplifier in Bridge-Tied Load (BTL)
•  Fixed gain of 30 dB in Single-Ended (SE) and 36 dB in Bridge-Tied Load (BTL)
• High output power
• Good ripple rejection
• Internal switching frequency can be overruled by an external clock
• No switch-on or switch-off plop noise
• Short-circuit proof across load and to supply lines
• Electrostatic discharge protection
• Thermally protected.

TDA8922 aplications:

• Television sets
• Home-sound sets
• Multimedia systems
• All mains fed audio systems
• Car audio (boosters).

TDA8922 circuit:

Circuit diagram TDA8922 Audio Amplifier 2 x 25W

TDA8922 layout and pcb:

pcb layout TDA8922 Audio Amplifier 2 x 25W

TDA8922 datasheet: