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:

NCP2890 Audio Amplifier 1W

NCP2890 general description:

The NCP2890 is an audio power amplifier designed for portable communication device applications such as mobile phone applications. The NCP2890 is capable of delivering 1.0 W of continuous average power to an 8.0 BTL load from a 5.0 V power supply, and 320 mW to a 4.0 BTL load from a 2.6 V power supply. The NCP2890 provides high quality audio while requiring few external components and minimal power consumption. It features a low−power consumption shutdown mode, which is achieved by driving the SHUTDOWN pin with logic low. The NCP2890 contains circuitry to prevent from “pop and click” noise that would otherwise occur during turn−on and turn−off transitions. For maximum flexibility, the NCP2890 provides an externally controlled gain (with resistors), as well as an externally controlled turn−on time (with the bypass capacitor). Due to its excellent PSRR, it can be directly connected to the battery, saving the use of an LDO. This device is available in a 9−Pin Flip−Chip CSP (standard Tin−Lead and Lead−Free versions) and a Micro8 package. NCP2890 Audio Amplifier 1W

NCP2890 features:

• 1.0 W to an 8.0  BTL Load from a 5.0 V Power Supply
• Excellent PSRR: Direct Connection to the Battery
• “Pop and Click” Noise Protection Circuit
• Ultra Low Current Shutdown Mode
• 2.2 V−5.5 V Operation
• External Gain Configuration Capability
• External Turn−on Time Configuration Capability
• Up to 1.0 nF Capacitive Load Driving Capability
• Thermal Overload Protection Circuitry
• AEC−Q100 Qualified Part Available
• Pb−Free Packages are Available
• NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes

NCP2890 aplications:

• Portable Electronic Devices
• PDAs
• Wireless Phones

NCP2890 circuit diagram: 

Circuit diagram NCP2890 Audio Amplifier 1W

NCP2890 layout pcb: 

PCB layout NCP2890 Audio Amplifier 1W

TDA8560Q Audio amplifier 2x40W

TDA8560Q general description:

Unfortunately, some of the proposed scheme in the network and even a scheme recommended by the developer (Philips), fail to achieve the desired result. As an example of how not to suggest that you include the TDA8560 material published on Online Soldering: Car Amplifier 2x40 Watt (I should note that everything except the input circuits and the number of points on diet, still deserves attention). the initial inclusion of IMS (at power up, the load is connected and there is no input signal) can throw you into a state of perplexity / mild shock (it depends on the degree of hope is for your TDA). Chip is unstable, there are noises when the input signal is amplified last weakly and passed with distortions. IC bypass surgery fixed resistor at the input, the other measures in consultation with the source device does not help. Why and what to do? Really caught Palen chip and will have to buy a new one? Not so fast! The fact that Philips did not include measures to prevent the self-excitation of the IC, but I think they know about it, but do not tell anyone (not good, gentlemen!) Rid chip excitement can (and should) in a way that is not described here. This is so far, my little secret. Usually TDA8560 include approximately recommend the following scheme: TDA8560Q Audio amplifier 2x40W

TDA8560Q Features:

• Supply voltage: 6 - 18; typical 14.4 V.
• The peak output current: 7.5 A.
• The current in idle mode: 120 mA.
• Long-term power output, with
• RL = 4 ohms, THD = 10%, F = 1 kHz, 25 W,
• RL = 2 ohms, THD = 10%, F = 1kHz: 40W.
• Voltage gain, Au: 40 dB.
• Input Impedance: 30 ohms.
• Input Sensitivity: 100 mV.
• Frequency response: 20 - 20000 Hz.
• Requires very few external components
• High output power
• Low output offset voltage
• Fixed gain
• Diagnostic facility (distortion, short-circuit and temperature detection)
• Good ripple rejection
• Mode select switch (operating, mute and standby)
• Load dump protection
• Short-circuit safe to ground, to VP and across the load
• Low power dissipation in any short-circuit condition
• Thermally protected
• Reverse polarity safe
• Electrostatic discharge protection
• No switch-on/switch-off plop
• Flexible leads
• Low thermal resistance.

TDA8560Q amplifier diagram, circuit:

TDA8560Q amplifier diagram, circuit

TDA8560Q layout:

TDA8560Q amplifier Layout

TDA8560Q amplifier pcb

Datasheet for TDA8560Q: Download

Tunable bandpass filters variable resistors

Tunable bandpass filters variable resistors

One of the difficulties in the design of higher-order tunable bandpass filters is achieving correct tracking of the variable resistors in the RC networks. The use of switched capacitor networks can obviate that difficulty, as is shown in this filter. The filter can be divided roughly into two stages: an oscillator that controls the electronic switches arid the four phase-shift networks that provide the filtering proper. The oscillator, based on a 555, generates a pulsating signal whose frequency is adjustable over a wide range: the duty factor varies from 1:10 to 100:1. Electronic switches ESI through ES4 form the variable resistors whose value is dependent on the frequency of the digital signal. The operation of these switches is fairly simple. When they are closed, their resistance is about 60 ; when they are open, it is virtually infinitely high. a switch is closed for, say, 25% of the time, its average resistance is therefore 240 . `Varying the open:closed ratio of each switch varies the equivalent average resistance. The switching rate of the switches must be much greater than the highest audio frequency to prevent audible interference between the audio and the clock signals. The input signal causes a given direct voltage across CI, so the op amp can be operated in a quasisym-metric manner, in spite of the single supply voltage. The direct voltage is removed from the output signal by capacitor C10. The fourth-order filter in the diagram can be used over the entire audio range and it has an amplification of about 40, although this depends to some extent on the clock frequency. The bandwidth depends mainly on the set frequency. The circuit draws a current of not more than 15 mA.

Tunable bandpass filters variable resistors

Stereo Amplifier Circuit TDA2007A 12W Bridge

Stereo Amplifier Circuit TDA2007A 12W Bridge general description

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 protection.

For description about stereo test circuit, PCB components layout of the circuit, the recommended values of the components of Stereo 12W Bridge Amplifier Circuit Diagram using TDA2007A can be seen.

 Stereo Amplifier Circuit TDA2007A 12W Bridge circuit diagram

 Stereo Amplifier Circuit TDA2007A 12W Bridge

Peamp circuit extra-deep bass change capacitor

Peamp circuit extra-deep bass change capacitor

The input impedance is the value of potentiometer Rl. If your instrument has extra-deep bass, change capacitor Cl to 0.5 mF. What appears to be an extra part in the feedback loop is a brightening tone control. The basic feedback from the op amp's output (pin 6) to the inverting input (pin 2) consists of resistor R7, and the series connection of resistor R4 and capacitor C3, which produce a voltage gain of almost 5 (almost 14 dB). That should be more extra oomph than usually needed.

Peamp circuit extra-deep bass change capacitor