The Circuit is designed to produce an amplifier using a TDA7294 audio integrated circuit allocation schemes for 60 watts of power.
Terminology

* Amps – something like a built-in amplifier and is designed for the delivery and provision of adequate and high maximum output directly drives speakers or fees within a certain percentage of distortion
* TDA7294 – monolithic integrated circuit in 15-watt multi-packs separately for use as audio class AB amplifier in Hi-Fi field applications such as high-profile television, home stereo powered speakers designed for short and their short-circuit protection very low noise and distortion, thermal off, mute and standby functions, not on / off noise, high performance, not Boucherot cells DMOS output stage and high operating voltage range of
* Amplifiers Class AB – operates as a class-B amplifier that almost all of the crossover distortion by removing a small amount of bias current that constantly flows through the output transistors

Circuit Explanation

100W audio amplifier circuit

Using the integrated circuit TDA7294 is best suited to operate in Hi-Fi audio applications, amplifier class AB. Sovereignty is capable of delivering both 4 ohm and 8 ohm loads, since the IC output current and a wide range of voltage. In addition, 8 ohm load with 0.1% harmonic distortion (THD) can be supplied with 50 W RMS, with the addition of sufficient power and the minimum number of components. Eliminates the presence of heat sink water temperature at a rate of 1,4 ° C / W. In standby mode, is treated with PIN-9, while the MUTE input from the pin 10 is treated. In standby mode is always a priority for the MUTE input.

The amplifier will be activated immediately, while inclusion. This is certainly connected through lessons without constantly on the supply rail. The conversion of clicks is by increasing the time constants of C5 C6 and & R4 & R3 can be eliminated. Due to internal thermal protection of the IC, the temperature at 145 ° C can cause MUTE condition and at 150 ° C, the amplifier is in standby mode. The Circuit amplifier must not be made without the presence of a radiator that internally to generate a negative supply rail is connected to be operated. In IC, the radiator of the amplifier in a grounded metal enclosure to be mounted in isolation. The maximum voltage for 8 ohm load 40V to 30V for 4 ohm loads, a transformer with 80 VA and 150 VA for two modules in a stereo amplifier rated.

100W MOSFET CIRCUIT

Circuit description: 
The 100-watt amplifier, basic research has been developed, which builds and (relatively) easily one a reasonable price. Has performed better (read: musical quality) than the standard STK module amplifiers are produced by using practicable and in any stereo receiver mass market today. When I built this thing, it was because I needed a 100 WPC amp and I wanted to spend the money. So I designed around all the parts I had in store.
The level design is more or less, and I’m sure there are no commercial units are similar. Knowlwdge For me, it is not an exact copy of the economic entity, nor I am aware that patents on Topology. For manufacturers to experience improved a lot and I know that improvements can be made but the idea was easy to hold and be able to do Anyone can do circuit of the United Nations and has the patience to do a sloppy job.
The input stage is a win is lf351 op amp, most of the open sky, as it stabilizes the dc voltage at rest. This then feeds a phase crossing, the swing voltage (-), Rail reference.

 The slope of the stage is an improvement Darlington High Linearity frerqency with. 2SC2344 the same collector has a large capacity Rather basic tension on. The MPSA42 demonstrate with a Low-Z and has a C (OB) PF few that is submerged by an effective CAP 33pF pole-splitting. And the stage) 2SA1011 the active load (current source, which provided an approximately 20 mA. The current scene is limited by a 2N3094 approximately 70 mA in worst case.
The result is a complete with outputs in Darlington complementary parallel. You could even though they cover, with one, if only 8 ohms easy to get to load the disk use is not recommended this. The use of machines in parallel increases the ability to drive reactive load (such as a significant current during the voltage waveform crosses zero and provides a high voltage and high curent through the transistor at a time) from L ‘ amp draw Can a High damping factor reduces and the maximum power transistor PROVIDE Peaks (remember, the profit on a drop of power transistors as the current increases).
       Compensation and poly case and a zero. The op-amp pole and the pole generated by the CAP 33pF, and the resistance of 470 ohms MPSA42 bias control. (the part of 33pF can benefit multiplied.) PF The capacitor 22 provides for compensation of lead and feedback will ADOTTAT from production tranconductance Rather than the production itself. It was in this way, the phase introduced by the output transistors, the feedback is not high frequency for the visa. This closed loop intorduces politicians, high-frequency limits. The two capacitors compensation must be type-1-creamic (NPO) mica or silver – with zero coefficients voltage signal.
          Amplifier Project was to be a 2-channel + / – 55 volt unregulated Run furniture, making up to + / – 48 volts at full load. It uses a 40-0-40 volt, 5 amp toroidal transformer, a rectifier bridge, 10,000 UF and filter covers per page. When using a standard EI transformer, a 6-amp rated units used. With this power, which produces 100 watts continuous, both channels driven into 8 ohms of resistance, without clipping. DB headroom and dynamic medium, and the United Nations. For more space, download voltages up to + / – 62 volt circuits may be used without modification.
Among other things, is the pattern in Postscript.
RESTRICTIONS:
           Without changes, the amplifier 4 ohm speaker systems are currently driving is no limit. The limit of a short circuit around a 4.5 A peak current, conventional speaker loads are discussed. (E ‘course at a higher peak current of the output swing approaches the rail.) If you perform either of these high-end speakers with the minimum means of impedance uncle, or that the stay is for REAGENT The range of most audio frequency (0.5 + J3.2 ohms) you might have a better amplifier than this. If the highest yield Motorola power transistors are used, the operation of a 2 ohm resistive load without any problems (), except for heat.
‘ve Never seen a slew-induced distortion on this amp with a CD of the band-limited (22 kHz) signal. I suppose fans of real high-end pieces can beat mixed with a TTL square wave signal with a pilot tone of a pick-19KHz stereo and Crank It Up will ensure that there is spectrum Spinges around, but who listens ?
Possible changes: (What power if I mo ‘?)
            The output transistors are Toshiba (Young 2SD424/2SB554) can not shoud USE superior supply voltages with a volt + / -60. If you intend to promote more use in parallel, or use the pairs 250 watt Motorola (MJ15024/MJ15025). A very low impedance should be increased, the slope of phase distortion in a drive with more than a basis for the release of Darlington Generating or add another gain stage current. Higher-beta (s faster) power transistors with reactive load is not worth a crap. Non-FT High When you replace sections is certified to have a fair distribution of the second chance.
              NE5532 op-amp can be used in input phase. If more than used the way for the + / -15 volt shunt regulator (symmetric ins UCCISE Bessel filter, etc.), the fall of 2.7K resistors Reduce might, for example, to maintain regulation 1.8K ohms. 2.7K resistors, but also can add up to 4 lf351 the type of op-amp regulator (Ho-hum balanced inputs 347 for a quad setup, in fine, DJ UN to prevent).
Recommendations of construction:
            The equalizer output and thermal transistor (2SC1567) to be mounted on a common heat sink – a unit measuring 5 centimeters high, with a rib 8 inches wide by 1.25 fins should do well for a channel. (You can see if pleasant) side of the case from them. Most applications do not require refrigeration normal than that. 2SC1567 And the reason for the Project for the bias regulator output was chosen because it is completely isolated – the version is more ECG mounting options. TO-3 outputs for the hardware is always convenient and easy to use.
The driver transistor amplifiers and voltage (2SC3344/2SA1011 couples) all require that, as a heat sink. Individual TO-220 heat sink is sufficient for the council – to dispel the tension of about 1.4 watt amplifiers. A common piece of 1 / 8 inch thick 1 cm x 4in. Aluminum angle will be long enough for all 4 on every channel, but be aware that they must be designed to take advantage of natural ventilation, must be and the transistor insualted.
Reasons attributable to keep separate from others, and a point. If this fails, the distortion high (5% or so), or are even vibration.
The bias output stage must be set to below about 25 milli ampere transistor output. This requires a value some time to stabilize, by You need more than an hour or so check during initial setup. Measure, measure the voltage across the emitter resistor and using Ohm’s law. This way you can participate in current output transistors in parallel at the same time to change and see if it was a serious discrepancy. Parties With the data of the same code, should not be turned off by more than 10%, after heated. Distortion power amplifier can amount used, but it takes more care to fix it. If you raise a quiescent current of more than 50 milli amperes per page, the value of the emitter resistors.
Initial Checkout:
Something just do not connect! Apparently a mistake, insignificant, can put your house on fire! (In addition to the blow out is worth 30 dollars in a microsecond transistors.) A variac will work in theory, but can the amplifier BOLT on the rail, if the offer is inadequate. I suggest using an Ballast Resistance – a 60-100-watt bulb in series with the AC power cord. Otti is a bright flash when you tap the application, it must be (almost) as the supply load current to reach its nominal value down. Amplifier and then typically work at low volume. If the amp draws too much power for any reason, the bulb shines, increase the resistance, and to limit the power to the circuit. In general, it is either a mis-wire (using DMM) Oscillation O (pointing to an area or RF power) of the metro. When the lamp is dim-dim-Bright-Light … And then the amplifier and marginally stable layout grounding should be reviewed. The values of the capacitors of adequate compensation should be, if they are not significant changes in the state. Mine is stable, as it is.
Further information:
The circuit is in PostScript, it should be printed Situation In soloist. Emitters of the transistors are designated by an “E”. I was too lazy by arrows on the symbols of transistors – and I use it in this way more than a year.
Find a particular problem? MCM (1-800-543-4330) has all the transistors. The total cost for a stereo version is to be between $ 150 S $ 250, a second type of operations of the case it could to find the transformer, and the heat sink. If you pay for ‘list’ of all to have, probably cost about $ 1,000 to build.
The information will HERIN is no guarantee, no warranty expressed or implied. Do not stand aside for the accuracy of the data is the author of technical information or the use of such false or assumed.
The equipment described in this article was designed, built and tested on my personal time with my personal resources.