Aug 091000Watt Power Amplifier

 AUDIO AMPLIFIER BTL

Audio amplifiers operate either in a BTL (bridged) or single-ended (“normal”) configuration. In the single-ended setup, the output lead goes to the “hot” or “+” side of the load (speaker or speaker box since we are talking audio) and the “-” or “negative” side of the load is tied to a common ground shared with the amplifier. In the BTL configuration, one amp is connected to the “+” side of the speaker (load) and a second amp is connected to the “-” side of the load. For this to work, the output signal from the second amplifier must be a “mirror image” (identical in every respect, but 180 degrees out of phase) of the output from the first amp. The BTL configuration is most often seen in low-voltage, battery-powered applications (like cell phones or “walkman” type personal tape or cd players etc) or in automotive applications over about 10 watts per channel.

In the BTL configuration, each amp drives half the load impedance. With the signals being out of phase, the voltage swing across the load appears to be doubled, and with each amp driving half the impedance the current is doubled. In theory the bridged pair will produce 4 times the power into the load that either amp acting alone could provide. In reality it seldom works that well.

This is an power amplifier circuit of a BTL system, which comprises a first op-amp chip which outputs an output signal having a same phase as an input signal input to a signal input terminal, a second operational amplifier which outputs an output signal having an opposite phase to the input signal, a voltage divider which generates a midpoint voltage of the input signal, a first resistor connected between an output terminal and a negative phase input terminal of the first operational amplifier, second and third resistors connected in series between the negative phase input terminals of the first and second operational amplifiers, a fourth resistor connected between an output terminal and the negative phase input terminal of the second operational amplifier, and an impedance converter connected between a midpoint voltage node of the voltage divider and a series-connection node of the second and third resistors. (end of abstract)

Gambar Rangkaian Power Amplifier BTL

List Componet:
R1, R2,R3, R4, R6………………… 10kOhm.
R3……………………………………… 20kOhm.
C1, C2, C3, C4……………………… 10µF.
Catu daya (VCC) ±12 V.

There are some important updates to this project, as shown below. Recent testing has shown that with the new ON Semi transistors it is possible to obtain a lot more power than previously. The original design was very conservative, and was initially intended to use 2SA1492 and 2SC3856 transistors (rated at 130W) – with 200W (or 230W) devices, some of the original comments and warnings have been amended to suit.

Skema Rangkaian 500Watt Power Amplifier

Note:

• This amplifier is not trivial, despite its small size and apparent simplicity. The total DC is over 110V (or as much as 140V DC!), and can kill you.
• The power dissipated is such that great care is needed with transistor mounting.
• The single board P68 is capable of full power duty into 4 Ohm loads, but only at the lower supply voltage.
• For operation at the higher supply voltage, you must use the dual board version.
• There is NO SHORT CIRCUIT PROTECTION. The amp is designed to be used within a subwoofer or other speaker enclosure, so this has not been included. A short on the output will destroy the amplifier.

Please note that the specification for this amp has been upgraded, and it is now recommended for continuous high power into 4 Ohms, but You will need to go to extremes with the heatsink (fan cooling is highly recommended). It was originally intended for “light” intermittent duty, suitable for an equalised subwoofer system (for example using the ELF principle – see the Project Page for the info on this circuit). Where continuous high power is required, another 4 output transistors are recommended, wired in the same way as Q9, Q10, Q11 and Q12, and using 0.33 ohm emitter resistors.
Continuous power into 8 ohms is typically over 150W (250W for ±70V supplies), and it can be used without additional transistors at full power into an 8 ohm load all day, every day. The additional transistors are only needed if you want to do the same thing into 4 ohms at maximum supply voltage! Do not even think about using supplies over ±70V, and don’t bother asking me if it is ok – it isn.

Aug 09

1000Watt Power Amplifier

This is a circuit of 1000watt power amplifier. This time I don’t have a picture to the circuit board, but because the amplifier circuit is quite simple, you can design it yourself PCB easily or you can order it at the store PCB audio kit in the center of electronic singosaren oriental, solo.

Skema Rangkaian Sanken 1000 watt

The assemble cables for DC power supply and output transistors must be large, use size 1.5-3mm for large current passed. The supply used transformer with 20A/45Ct and at least 4×10000uf/80 volt capasitor. this circuit is able to supply power 10000watt therefore the power transistor will be very hot, give good cooling fan on the power transisitor

Transitor alternative to replacement of the 2SA1494 is 2SA1216 From SANKEN. The transistor has a 200-350 watt power dissipation of each pair so that for long-term operation of more durable. Keep in mind, usually sold a pair of power transistors with its complement, so you can not buy 2SC2922 alone without 2SA1216 or 2SA1494 without 2SC3858. The price range for transitor tsb is 30-40 thousand Rupiah / pair.

Aug 09

Power Amplifier MJ15003 -MJ15004

When I began the design of this amp, my goal was to make a product better suited for the reproduction of complex music and voice. Although I emphasize the high electrical properties, the most important requirement is to create a superior sound, vivid images and superb spatial aural clarity.Although the average level of listening is usually less than 10 watts, my design concept was to an amplifier with plenty of reserves, but the deviation is for Class A, at the height of the audience of cross-over distortion at a very low level. There is no place in the pathway, enhances the precision of the tonal characteristics of instruments and voices clearly. This Amplifier is virtually zero phase distortion over the audio range resolution is perfect and completely color the sound.

Skema Rangkaian Power Amplifier MJ15003 -MJ15004

Amplifier Specification:
Maximum Output: 240 watts rms into 8 Ohms, 380 watts rms into 4 Ohms
Audio Frequency Linearity: 20 Hz – 20 kHz (+0, -0.2 dB)
Closed Loop Gain: 32 dB
Hum and Noise: -90 dB (input short circuit)
Output Offset Voltage: >13 mV (input short circuit)
Phase Linearity: > 13 0 (10 Hz – 20 kHz)
Harmonic Distortion: > 0.007% at rated power
IM Distortion: > .009% at maximum power

2000Watt Power Amplifier

Thursday, April 8th, 2010

This power amplifier circuit provides up to 2000Watt, it has to be said that this amplifier will blow up any speaker connected to it. I recommend this as a ‘thought experiment’, rather than actually doing it!. 110V RMS into 8 ohms is 1500 W. How long would you expect the speaker to last? Most will be toast within perhaps 30 seconds or less!

Skema rangkian power amplifier sound system 2000 watt

The transistor Q5 (the bias servo transistor) is mounted on the heatsink, in excellent thermal contact. This is because, unlike most of my other designs, this amp uses conventional Darlington output configuration. It is necessary to use a Darlington arrangement (or a low power Darlington transistor as shown) for Q5 to ensure that the bias remains at a safe value with temperature. There is probably good cause to model and test this aspect of the design very carefully, because it is so important. The arrangement as shown will reduce quiescent current at elevated temperatures. For example, if total Iq at 24°C is 165mA, this will fall to ~40mA at 70°C. This is probably fine, because there is some delay between the a power ’surge’ and the output transistors transferring their heat to the bias servo via the heatsink.

The power supply needed for an amp of this size is massive. Grown welding machines will look at it and cry. For intermittent operation, you need a minimum of a 1000VA transformer (or 1500VA for the 2000W version), and it will have to be custom made because of the voltages used. If you expect to run the amp at continuous high power, then transformers should be 2kVA and 3000VA respectively. Filter capacitors will pose a problem – because you need caps rated for 150V, these will be hard to find. Because high voltage high value caps can be difficult to find, it may be necessary to use two electros in series for each capacitor location. This is the arrangement shown. You must include the resistors in parallel – these equalise the voltage across each capacitor so that they have the same voltage. Remember to verify the ripple current rating! This can be expected to be over 10A, and under-rated capacitors will blow up.

Skema Rangkian Power Supplay 2000 VA

WARNING
This project describes an amplifier, power supply and tests procedures that are all inherently dangerous. Nothing described in this article should even be considered unless you are fully experienced, know exactly what you are doing, and are willing to take full 100% responsibility for what you do. There are aspects of the design that may require analysis, fault-finding and/or modification