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

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:

TDA7482 Audio Power Amplifier 1-channel 1 x 25W

TDA7482 general description:

The TDA7482 is an audio class-D amplifier assembled in Multiwatt15 package specially designed for high efficiency applications mainly for TV and HomeStereo sets. TDA7482 Audio Amplifier 1 x 25W

TDA7482 features:

• 25W OUTPUT POWER:
• RL =8Ω/4Ω; THD = 10%
• HIGHEFFICIENCY
• WIDE SUPPLY VOLTAGE RANGE (UP TO±25V)
• SPLITSUPPLY
• OVERVOLTAGEPROTECTION
• ST-BY AND MUTEFEATURES
• SHORTCIRCUIT PROTECTION
• THERMALOVERLOADPROTECTION

TDA7482 circuit diagram:

TDA7482 Audio Amplifier 1 x 25W circuit diagram

TDA7482 sterio circuit layout:

TDA7482 Audio Amplifier 1 x 25W pcb layout

LM386N Audio Power Amplifer Amplifier 1x2W

LM386N general description:

The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value up to 200. The inputs are ground referenced while the output is automatically biased to one half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply, making the LM386 ideal for battery operation. LM386N Audio Amplifier 1x2W

LM386N features:

• Battery operation
• Minimum external parts
• Wide supply voltage range: 4V–12V or 5V–18V
• Low quiescent current drain: 4mA
• Voltage gains from 20 to 200
• Ground referenced input
• Self-centering output quiescent voltage
• Low distortion: 0.2% (AV = 20, VS = 6V, RL = 8Ω, PO =
• 125mW, f = 1kHz)
• n Available in 8 pin MSOP package

LM386N circuit diagram:

LM386N Audio Amplifier 1x2W

LM386N layout:

LM386N pcb layout

LM386N pin layout:

LM386N pin layout: