Showing posts with label 50w. Show all posts
Showing posts with label 50w. Show all posts
Thursday, November 6, 2014
Simple 50W Hi Fi amplifier with TDA7294
The TDA7294 is a Hi-Fi amplifier and can give 100W RMS but with 10% distortion. Supplying 30 Volts you can have 50 Watts RMS with 1% distortion. Frequency range start at 16Hz and can reach 100KHz. Make sure you are using good heatsink. The chip supports mute function as well.
50W Hi-Fi amplifier Circuit Diagram
A symmetrical 30V power supply is all its need to power the unit.
Thursday, October 16, 2014
50W Electronic Amplifier Rise
This electronic amplifier project is an IC amplifier module from ST Microelectronics, the TDA7294. It is intended for use as a top quality audio class AB amplifier in hi-fi applications. Its low noise and distortion, wide bandwidth and nice output current capability, enabling it to supply high power in to both four ohm and 8 ohm lots. Its both short circuit and thermal protection.
With the addition of a handful of parts and an appropriate power supply, this module will deliver over 50W RMS in to four or 8 ohms-with < 0.1% Total Harmonic Distortion (THD) and < 0.1% Inter-modulation Distortion (IMD). It is also suitable as a replacement power amp stage, or upgrade for plenty of existing amplifiers of between 30W-50W, provided they have an appropriate dual supply, & most do.
With the addition of a handful of parts and an appropriate power supply, this module will deliver over 50W RMS in to four or 8 ohms-with < 0.1% Total Harmonic Distortion (THD) and < 0.1% Inter-modulation Distortion (IMD). It is also suitable as a replacement power amp stage, or upgrade for plenty of existing amplifiers of between 30W-50W, provided they have an appropriate dual supply, & most do.
The Specifications of the electronic amplifier project there are:
D.C. Input : 35V
Output power : > 50W RMS, 4-8 ohm load.
Gain : 24 dB (30dB modification)
Input sensitivity : one.3V for 50W, 8 ohm
Signal-to-Noise ratio : > 95 dB, (>105 dBA)
Frequency response : approx. 20Hz - 200kHz, �3 dB
Slew rate : > 10V/uS
THD : < 0.01%, 1W-40W, 1kHz
IMD : < 0.01%, 1W
D.C. Input : 35V
Output power : > 50W RMS, 4-8 ohm load.
Gain : 24 dB (30dB modification)
Input sensitivity : one.3V for 50W, 8 ohm
Signal-to-Noise ratio : > 95 dB, (>105 dBA)
Frequency response : approx. 20Hz - 200kHz, �3 dB
Slew rate : > 10V/uS
THD : < 0.01%, 1W-40W, 1kHz
IMD : < 0.01%, 1W
The maximum supply voltage of the IC is +/- 40V. However the maximum dissipation of the IC can be exceeded even at a lower voltage. Therefore the supply voltage used require not be over +/- 35V. This can be constructed using a 50V middle tapped-transformer, a diode bridge rated at 5A (min.) & a pair of electrolytic capacitors, as shown below. A lower secondary voltage transformer could even be used but the reduced DC voltage will lead to less power output in to 8 ohms. You can still receive 50W in to four ohms with only 24V supply rails.
A 36V C.T. transformer will give you approx +/- 25V rails. The-mains transformer used ought to be rated at a maximum of 80VA. In the event you require to run modules in a stereo amplifier you can use a common power supply. In this case the transformer ought to be rated at 150VA or greater.
A 36V C.T. transformer will give you approx +/- 25V rails. The-mains transformer used ought to be rated at a maximum of 80VA. In the event you require to run modules in a stereo amplifier you can use a common power supply. In this case the transformer ought to be rated at 150VA or greater.
Electronic Amplifier Circuit Diagram Description
Most of the circuitry is contained within the IC module. The input signal is applied to pin three by capacitor C1 & low-pass filter R1/C2. The filter improves the pulse response & helps cease RF signals. The lower -3dB point is determined-by R2/C1 & R4/C3. This is about 20Hz for the values used. The upper -3dB point is over 200kHz. C7/C8 & C9/C10 provide additional power supply filtering or decoupling.
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R3/R4 are the feedback resistors. The gain is 1+R3/R4 which is approx 16 times, or 24dB. In case you need to increase the input sensitivity you may alter the resistors to suit. Changing R3 to 22k would increase the gain to 30dB and lower the input-required for 50W in to 8 ohm, to 0.6V, without affecting performance much. In case you reduce the worth of R4 you will also need to increase C3 to maintain bass response, as this sets the feedback low frequency roll off.
Pin ten is a mute input and pin 9 provides a standby mode. Muting ought to always happen before standby mode is selected. Connecting these pins permanently to the supply rail ensures that the amplifier comes on immediately on power up. Any switch-on clicks may be eliminated by increasing the time constants of R5/C4 and R6/C5 if necessary.
Make definite that a heavy duty heat-sink rated at least one.4 degree C/W or better is used.
Pin ten is a mute input and pin 9 provides a standby mode. Muting ought to always happen before standby mode is selected. Connecting these pins permanently to the supply rail ensures that the amplifier comes on immediately on power up. Any switch-on clicks may be eliminated by increasing the time constants of R5/C4 and R6/C5 if necessary.
Make definite that a heavy duty heat-sink rated at least one.4 degree C/W or better is used.
Saturday, September 6, 2014
TDA7490 Audio Amplifier 2 x 25W 1 x 50W
TDA7490general 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:
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| TDA7490 Audio Amplifier 2 x 25W / 1 x 50W circuit diagram |
TDA7490 mono circuit diagram:
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| TDA7490 Audio Amplifier 2 x 25W / 1 x 50W mono circuit diagram |
TDA7490 sterio circuit pcb:
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| TDA 7490 pcb layout |
Sunday, August 31, 2014
50W Audio Amplifier
The schema is designed such that most of the components are not critical and can be easily replaced by nearest values.This make it ideal to assemble from your electronics junk box.
The capacitor C1 controls low frequencies and capacitor C2 controls high frequencies.The schema ia basically a class B amplifier.The transistors 2N 3055 serves the function of driving the speaker.The other transistor functions as pre amplifiers for the driver stage.This is the basic scheme of the schema.The maximum power level of amplifier can be set by adjusting the 500 Ohm POT connected with the BC107 transistor.
Notes:
- The schema can be powered using a 50 V DC power supply with 5A current rating.Up to 60 v can be given to the schema.Any way the power supply must be well regulated and filters to avoid noise.
- Adjust the 500 ohm POT to obtain optimum performance.
- All capacitors must be rated higher than the supply voltage.
- Volume control can be attained by connecting a 10 K POT in series to the input of the amplifier.(Not shown in schema).
Monday, August 25, 2014
50W audio amplifier with ICs
The above amplifier circuit based on IC is STK075G, and another equation that is STK084G, STK085, STK086G. and among ic I mentioned that I recommend using ic high supply voltage and high output power and good quality. You can see every ic datasheet at Alldatasheet.com above. Supply voltage between 20 to 55 Volt DC.Read more
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