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19:23 , , ,





TDA7293 + upc1237 integrated amplifier speaker protection circuit board,with Morocco genuine IC, clear and transparent sound quality!
Audio channel, "European "style, all with Philips capacitors:decoupling filtering using Philips C 470uf/50v audio capacitors, Philips 0.1uf, 100V MKT, input capacitance Philips 1uf/250V MKP (better than MKT ! less waste!) bootstrap capacitor: PhilipsPHILIPS22uf/100V audio capacitor, negative feedback DC blocking capacitors Philips 22uf/100V, full-bridge 25A1000V (15A is sufficient), filter capacitor 12000uF 2 only (measured). Coupling, bootstrap, negative feedback DC-blocking capacitors were installed before the match, reduced errors, more accurate positioning to pan!




Circuit real materials, design science will have good sound, small volume whenthe soft and delicatetenderness allows you to enjoy a "European style"! Alt bursting bright when you'll likely getloud!


Circuit design features:
1:relay protection circuit can not be omitted!A speaker a few hundred dollars, and an IC tens of dollars!Switch which is no current impact sound amplifier fever minimum requirement!
2: Integrated rectifier, horn protection, power amplifier into one, convenient!
3: The filter capacitor is measured using instruments elected, the board adopted Sanyoung12000UF50WV, all of the measured capacity is greater than 10000uF, to ensure bursting with power! (Lot of brands on the market are sets of skin capacitance, renovation, disassemble parts, simply by the instrument that pays top academics ... a lot of testing capacity is only half! Filter capacitor also instruments speak for themselves!)
4: Audio channel system used in Europe and Philips MKT Philips electrolytic capacitor decoupling, resolving power better! The protection circuit uses Japanese-made capacitors do not waste resources and
5:1% of the audio channels all use metal film resistors;input capacitance with MKP. The face of hundreds of high-power operational amplifier K resistance, input capacitance, although little effect on MKP psychological effect or to vote for it!
6: The most critical is the choice of high-power amplifier TDA7293IC, you may not believe that a model with the quality of different batches of the IC 369 will be divided and so on, but I tested a few batches of the TDA7293, even sound different! In order not to touch the interests of some business, do not say. OUR engineer "winnowed out" some good batches of IC on Taobao only for your reference!




Recognition of experience TDA7293/7294 Post:http://www.avtech.cn/dispbbs.asp?boardid=4&Id=418


Is limited, I hope you valuable advice!




TDA7293ICbasic parameters:
Power: 140W +140 W
Output Impedance :4-8 ohms
Harmonic Distortion: 0.005%
Input voltage :24-30V dual AC input (recommended).
Board body size: 14 X 7.8 X 6 dimensions (cm)


Note: IC such as TDA7293 or TDA7294 heat sink and the negative power of its similarities to install the radiator and IC must be isolated from insulation, thermal conductivity recommended mica and particles, buying power amplifier board shop and complimentary high-quality mica particles


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19:18



Common market Hi-Fi integrated circuit (IC) power amplifier, mainly the following three products:



  1. National Semiconductor Corporation (NSC), on behalf of products LM1875, LM1876, LM3876, LM3886, LM4766 and so on. 

  2. Dutch Philips (PHILIPS), on behalf of products TDA15×× series, the more well-known is the TDA1514 and TDA1521. 

  3. Italian - French Microelectronics (SGS), the more famous is TDA20×× series and DMOS tube TDA7294, TDA7295, TDA7296. NSC warm neutral tones the company's products, Philips is more bright and delicate products.



Integrated Circuit (IC) power amplifier heat sink comes with two types of insulated and non insulated. Insulation class, such as the LM series suffix TF varieties, the overall molding process, simply fixed directly to manifold and radiator. Most of the exposed metal heat sink integrated amplifier is a non-insulated type, the heat sink generally negative supply connected, not to use its contacts with other parts of the amplifier (especially the case with the ground), otherwise the damage immediately Manifold. 


I found that by comparison, non-insulated block of the thermal resistance of the lower class of power amplifier output power to be slightly larger.


On the circuit in the form of choice, I think that, with the manufacturer to the voltage feedback circuit, and were also given on the basis of indicators to test out, since the recommendation, the circuit should be able to play better the performance of integrated block, the actual is also true. Current feedback and DC servo amplifier is an integrated application of a useful attempt, but the results should not be overstated.



DC voltage should not get too high, or only Manifold serious fever, and the sound quality deterioration, and may lead to over-voltage protection circuit malfunction. Should give priority to the use of manufacturers recommended voltage, if not, can be the limit × 85% voltage DC voltage, then divided by the DC voltage AC voltage was 1.25.



Amplifier without the use of power supply, but the power of the power capacity must be adequate. Desirable power transformer twice the total output power, and well shielded. Rectifier to choose low internal resistance, and both ends of each tube and on a small capacitor. Filter capacitance Enough is enough, do not blindly seek large, can be calculated per 10W 2200μF. If funded, with the transformer more effective.



Integrated amplifier with external components small, quality product should be selected. Coupling capacitor MKP better not to use electrolysis, the larger-capacity tantalum electrolytic bypass capacitors can be used, use a small capacitor CBB or MKP. To make use of rings of metal film resistors or Holco resistor, and power can not be less than 1/4W, 1/2W the conditional use. In the installed components should be checked before and pay attention to the error and the pair of. Do not blindly imported supplements, supplements, low cost components Moreover, many fakes.



Amplifier circuit layout should follow three principles:



  1. Point grounding. Integrated circuit, the input, the output filter capacitor to have a separate receipt to the "point", do not any overlap, to avoid the introduction of noise. 

  2. Size of the signal separation. The input signal should stay away from the output signal and power, the specific design printed board, there are two ways, one is a single signal flow method, the printing plates from one end of the input signal, the other end of the output; the other is ground isolation method that the size of the signal isolation between the land line. 

  3. Transmission mask. Small-signal transmission lines must use shielded cable, and single-grounded shield. Other aspects, such as symmetrical layout of components, increase the ground area and increased width of high-current copper foil (or even on the tin, etc.) are also beneficial to reduce the noise. Isolated input inductor can be installed, the output inductor installed damper



As today's digital audio output voltage swing is sufficient to achieve most of the integrated amplifier's input sensitivity, so the application just before a buffer stage, volume control and sound deployment of the role. There are two types commonly used in the first stage, one is before the op amp-type level, the higher its index, the sound quality is better, but must use high-quality potentiometers; the other is constituted by a dedicated integrated circuit before the tone volume level, such as LM1036, LM4610, TDA1524, etc., they are low cost, simple and easy system to use does not affect the sound quality of ordinary potentiometer, and the results satisfactory, fans can choose according to the actual situation.



Today, various types of integrated amplifiers have adopted the relevant protection measures, by contrast, NSC's LM series should improve some, but not foolproof, especially for the protection of fragile speakers. So, if you use more expensive speakers, I still recommend installing speaker protection and good Power Supply component.


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18:50 , ,



Brief Description:



IC PT2399 from Princeton Technology Corporation. Pin  15 and pin 16 to form a capacitance by changing the external resistance to change the input frequency response of the inverting amplifier, as the signal input. Pin 8, pin 9, pin 10 form an external pre-emphasis - Compare the source set, the internal microcontroller output DO0 after passing through the circuit compared with the input signal, thus completing the A / D conversion, and then 1bit of data into the microcontroller the Delay Line. 


Similarly, pin 11, pin 12 and pin 7 form to add - Compare source circuit, the signal from pin 12 out. And pin 13 , pin 14 is a separate inverting amplifier, and not directly connected with the internal processing circuitry, it can be used flexibly for the designers.


Pin 6 to control the speed of the internal MCU Delay Line VCO input, changing the voltage can change the delay time, and from pin 5 to monitor the current oscillation frequency. Pin 2 for the internal op amp reference when a single supply source, the integrated circuit is well within 1/2 partial supply voltage, so only the external access to anti-ripple circuit (voltage regulator) to.


PT2399 frequency response within the limits of about 5kHz, and when the input signal when the frequency is higher than 4kHz, sine wave input signal will become somewhat similar to the triangle wave, and in the input signal frequency is greater than 5kHz, it will produce distortion and digital noise. 


Although the guitar signal in the above information on this range is relatively small, but the delay of the chip to deal with these frequency response will be smooth and some distortion.
  

PT2399 input signal amplitude is about 3Vpp signal level higher than this range will be limiting. In the above diagram, the change of pin 15, pin 16 of the resistive and capacitive components, you can change the input frequency response; change components on pin 12 , pin 13, pin 14 of the resistive and capacitive components, you can change the output frequency response. 


The internal structure of integrated circuits based on PT2399, the two parts of the design is the operational amplifier filter design, designers can calculate the actual situation, to not repeat them here.
  

In addition, PT2399 VCO external setting resistors to the minimum, the delay time is 31.3ms, because of this a long time, not suitable for production of chorus or Flanger effects.


For more future information about IC PT2399



Source : http://http://www.avtech.cn/dv_rss.asp?s=xhtml&boardid=4&id=64&page=2






Echo Application Schematic Circuit





Guitar Effect Application Schematic Circuit



Bottom Layout of PCB



Component Layout of PCB


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03:35
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03:23
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