Schematic & Wiring Diagram

TDA7294 is an integrated, monolithic, Class AB audio amplifier designed precisely for Hi-Fi applications. The IC has a DMOS output stage and can deliver 100W RMS into an 8Ohm speaker at +/-38V dual supply.

In the circuit TDA7294 is configured to provide 100W output power into an 8Ohm loudspeaker at +/- 38V supply. C8 is the input coupling capacitor and the input is applied to the non-inverting input (Pin3) of the IC. C3 and C9 are power supply filter capacitors although C10 and C4 are bypass capacitors. C2 is the bootstrap capacitor.

RC network comprising of R1 and C1 improves the high frequency stability of the amplifier and as well prevents oscillations. R2 and C6 sets the mute time constant while R3 and C5 sets the standby time constant. S1 the mute switch and S2 are the standby switch. R5 is the input resistance and the amplifiers input impedance has a direct relationship to its value. R4 and R6 is employed for setting type closed loop gain and With the used value, gain is 30dB. C2 is a DC decoupling.

This circuit is designed to indicate the power level output of any audio amplifier. It's simple, portable, and displays three power levels can be adjusted to any desired value. For a standard power amplifier hi-fi stereo, the output values ​​suggested are:

• D5 illuminates at 2W
• D4 illuminates at 12.5W
• D3 illuminates at 24.5W

The above values ​​were selected for easy setup, but other options are possible. IC1A is the input buffer, feeding 3 voltage comparators and LEDs drivers by means of a variable DC voltage obtained by R5 and C4 smoothing action. In order to achieve stability of adjustment, the supply of IC1 and trimmers R6 and R7 is reduced and is subject to 5.1V by Zener diode D1.

This Audio Amplifier design is based on the audio amplifier 18 watts, and was developed primarily to meet the requests of correspondents unable to locate the chip TLE2141C. It uses the NE5532 Dual IC wide, but obviously, its power output will be written in the 9.5 - 11.5W range, as the supply rails can not exceed ± 18V.

As amplifiers of this type are often used to drive small loudspeaker cabinets, the bass frequency range is rather sacrificed. Therefore, a Bass Boost control was inserted in the amplifier feedback loop, in order to overcome this problem, without loss of quality. The low elevation curve can reach a maximum of 16.4 dB @ 50Hz. In any case, even when the bass control is turned fully counterclockwise, the amplifier's frequency response curve shows a gentle rise: 0.8 dB at 400 Hz, 4.7 dB at 100 Hz and 6 dB at 50 Hz (referred to 1 kHz).

TDA1514 is a hi fi audio amplifier may output of 50W of sound. The power supply is 10V and 30V. Can be used as an amplifier at home.

The integrated circuit TDA1514 power amplifier is a high fidelity for use as a basic component in applications of radio, television and other audio. The TDA 1514 is fully protected circuit, also has a mute function that can be arranged for a period after the ignition delay time set by external components. The device is designed to power symmetric, but asymmetric source can also be used. For stereo amplifier configuration uses two identical circuits.

This is simple class A MOSFET amplifier 2SK1058 used in the circuit. It is easy to do, you should use a 24V supply volt at high current. using amplifier with Class A tube preamp based on 12AU7. It produces the purest sound. I have no idea of ​​the levels of distortion, but has a very fine and delicate texture quality. With only one watt speaker output should be used efficiently. Lower is better than expected and the stage design of the units of my 12 "base 63L 3-way speakers with ease.

The following is a small audio amplifier comparable to what you may come across a small transistor radio medium size. The input stage is biased to ensure that the power is divided equally to provide the two complimentary output transistors which are slightly biased in conduction of the diodes between the bases. A 3.three ohm used in sequence for the use of the issuers of the output transistors to stabilize the bias current that does not change significantly with temperature or several transistors and diodes.

Due to recent increases in bias voltage between the emitter and base decreases as a result of minimizing driving. Input impedance is 500 ohms and the voltage gain is approximately five to eight ohm speaker connected. The voltage swing around the speaker is 2 volts without distorting production and capacity is at the same time in the 50 milliwatt range. A high voltage provided as well as the addition of heat sinks in the output transistors would be a great source of more power. Circuit thirty milliamperes draw a supply of 9 volts.

The back scheme will provide the best Motorola for any MRF141G typical application (including the functions of stabilization parasites), a power of broadband RF MOSFET put a conservative 300 watts rated through the broadcast band FM. The flange on the MRF141G be mounted on a heat sink, a copper plate 5 / 16 "thick and 6" x 8 ", which is mounted to the heat sink with 6-32 machine screws in the case that the heat sink is drilled and exploited.

CAUTION: This amplifier operates at very high energy ranges. You could receive significant RF burns if it comes in contact with open coaxial power of the amplifier. Also, if your transmitting antenna is mounted on the ceiling, and it should fly in a wind storm despite eating all the power of this amplifier, you can start a fire in certain types of roofing insulation! Be very careful with the use, installation and operation of the unit.

Here is a circuit 120 watt stereo amplifier using STK4241V. The MAX9710 a stereo audio power amplifier capable of delivering 2 x 120 W of the IC to put loads of 8 ohms. MAX9710 can be operated from ± 32V single power supply of ± 54V.

This amplifier circuit is ideal for audio devices for home supply. STK4241V amplifier specifications might lead one to believe that you can use supply voltages of ± 78V. With zero input signal (and therefore no way out) I could, but I would not recommend anything better than ± 45V 8-ohm loads, if expected, although ± 54V will be fine if you can provide a good heat sink.

TDA4935 2x15W audio amplifier is high quality Siemens IC. The IC can be used in stereo or bridge mode. In stereo mode can deliver 15W Stereo audio Amplifier using TDA 4935 per channel in bridge mode can deliver 30W to an 8 ohm load at the source of 30V. TDA4935 requires very few external components and has an ample supply voltage range. The IC operates in class B and has built-in protection circuits over temperature and overload protection.

Notes :

• The circuit must be assembled on a good quality PCB.
• TDA 4935 must be fitted with a proper heat sink.
• The supply voltage can be anything between 8 to 30V DC.
• Capacitors C1, C2, C8 are polyester capacitors.
• Capacitors C3, C4 and C6 are ceramic capacitors while C5 and C9 are electrolytic.

Via : circuitstoday.com

A 6 watt Hi Fi Audio amplifier TDA2613 . TDA2613 is an integrated hi-fi amplifier IC from Philips Semiconductors. HF is on / off test, click, short-circuit proof, thermal protection and is offered in 9-pin single in line package of plastic.

In the given circuit, TDA2613 connected to the control of a supply. Capacitor C4 is the DC input, while decoupler capacitors C5, C6 are the filters of the power supply. Audio is fed to the non-inverting input through capacitor C4. Inverting input and Vp / 2 pins of the IC are connected along and grounded through capacitor C3. Capacitor C2 couples the speaker to the output of integrated circuits and the network comprising capacitor C1 and resistor R1 improved high frequency stability.

This is cable TV amplifier using 2 transistors. This amplifier circuit is for cable TV systems using Ohm coaxial cables and works fine up to 150MHz. Transistor T1 performs of amplification. Up to 20dB gain expected from the circuit.T2 is wired as an emitter follower current gain.

assembled on a Vero board

Use 12V DC for powering the circuit.

Type no of the transistors are not very critical.

Any medium power NPN RF transistors can be used in place of T1 and T2.

This is just an elementary circuit. Do not compare it with high quality Cable TV amplifiers available in the market.

This 12w amplifier circuit is build round the TDA2006 integrated circuit who options a brief circuit protection system, and a thermal shutdown system in case of overheating. With a 12v power supply the circuit delivers 12w on a 4 ohm speaker and 8w on a 8 ohm speaker. The integrated circuit will work with a power supplyr between 6v and 15v max.



The TDA2006 is monolithic integrated circuit in package, {supposed to be used as a low frequency category "AB" amplifier. At ±12V, d = 10 and frequently it provides 12W output power on a 4Ω load and 8W on a 8Ω . The TDA2006 provides high output current and has terribly low harmonic and cross-over distortion. any the device incorporates an inspired (and patented) short circuit protection system comprising a rendezvous for automatically limiting the dissipated power therefore on keep the operating urpose of the output transistors at intervals their safe operating space. a standard thermal shutdown system is additionally included. The TDA2006 is pin to pin equivalent to the TDA2030

This class A amplifier circuit requires a preamp as it hasn't got much gain. Requires large heat sinks and a large transformer and a source of great power and wiring carefully, but the end is very simple and sounds great. The zener diode disclaims any wave from the power supply, but still just want a wave of 10mV max. The ripples reaching the entrance is amplified, so the zener get rid of that, but there is still dominated him to reach the power stage.

Many early amplifiers operated in Class A, but as 10W power output rose above the problems of heat dissipation and design of the power supply caused most manufacturers to turn to the simplest, arrangements more efficient class B and put up with the consequent decrease in the perceived quality of output. Why Class? Because, when biased in class A, the transistors are always on, always ready to respond instantly to an input signal. Class B and Class AB output stage requires a microsecond or more on. The kind of a cleaner operation allows operation under high voltage swing that occurs when the transient audio signal feed difficult loads. Your amplifier is basically simple, as shown in the block diagram.

This is 4 watts amplifier circuit diagram for implementing portable radio with TDA1011 from Philips Semiconductor.



The TDA1011 is a monolithic integrated audio amplifier in one place-9 in line (SIL) plastic container. The device is specially designed for portable radio and recording applications and offers up to 4 W at a load impedance of 4 W. The device can deliver up to 6 W 4 W to 16 V power load on the network powered applications. The maximum permissible voltage of 24 V makes this circuit very suitable for DC and AC unit, while the application supply voltage of 3.6 V low V enables applications 6.

The audio amplifier circuit is a class B amplifier audio power with a TDA1010. It is easy to build and has only a few external components. The circuit is designed with a short circuit and thermal protection. You can drive loads as low as 1.6 ohms and is capable of 10 watts deliveringover from an external 16 V DC.

The TDA1010 is a monolithic integrated circuit class B audio amplifier in one place-9 in line (SIL) plastic container. The range of voltage across and the flexibility of the IC to be an attractive proposition for turntables and tape recorders with outputs of up to 10 W

The TDA1514 chip circuit is a hi-fi ability amplifier for use as a architecture block in radio, tv and added audio applications. The TDA 1514 ambit is absolutely protected, additionally has a aphasiac action that can be abiding for a aeon afterwards power-on with a adjournment time anchored by alien components. The accessory is advised for balanced ability food but an absurd accumulation may additionally be used. For stereo amplifier agreement use two identical circuits.

audio amplifier 8W using TDA 2030 can achievement 20 W but in this schematic we accept bargain the ability to 8w and we use 10w speakers. The ascribe sensivity is about 200mV and the amplifier is set by the 47k and 1.5k resistors.

Here is a simple audio amplifier application a TL431 blow regulator. The amplifier will accommodate room-filling aggregate from an accustomed clear radio outfitted with a long-wire antenna and acceptable ground. The chip is agnate in complication to a simple one-transistor radio but the achievement is far superior.



The TL431 is accessible in a TO-92 amalgamation and it looks like an accustomed transistor so your hobbyist accompany will be afflicted by the aggregate you are accepting with alone one transistor! The amplifier may be acclimated for added projects, too. Higher impedance headphones and speakers may additionally be used. An earphone from an old blast will accord boisterous aggregate and abundant sensitivity! The 68 ohm resistor may be added to several hundred ohms back application aerial impedance earphones to save array power.