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Mj21193 amplifier instruction

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PDF MJ21193 Data sheet ( Hoja de datos )


Comparison of the sizes of the original large and fake small crystals of transistors 2N Shared board for two channels of the JLH amplifier and two voltage stabilizer channels. Test of the JLH amplifier from the pulse power supply. Practically straight "regiment", and the decline of the beta begins with amps!!!

A very good result gives parallel inclusion at the output of transistors of the average power of 2SC, previously selected according to Batte they have very high - up to We have a transistor on a common copper plate, and then it is fed to the radiator through the gasket, to solder the low-melting point of Posh Do not use MJL, these transistors are not for this amplifier.

Moreover, at 4 ohm load. Here in the one-shot repeater of Igor Seusnin or amplifiers with composite transistors at the outlet of them. In an amplifier according to the JLH scheme, the higher the soutness of the output transistors and the prestigious - the better. The distortion was 0. Under the same conditions, low-frequency motorolas with a low beyon are distorted with a distortion of 0.

At the output, it is necessary to be adjusted from the excitation of the installation of capacitors between the base and collector of the drive transistor of about PF and the capacitor with a capacity of PF parallel to the OOS R5 2. Modern transistors are losing vintage in the quality of the playback of LF.

MJL combine the advantages: flat-friendly housing and a narrow strip of True, they have two "minuses" - high cost and small gain coefficient. Old LF transistors behave better than the new-fashioned HF. In this sense, it is worth trying our CTKT Copper metallization was used on the surface of the crystal for the formation of the base output, which lines the surface temperature of the crystal, improves the current distribution on the crystal area and expands the ORP, especially in the high voltage area.

I tried multiple transistors in the driver, the best results showed 2SC, which is natural. It has Batt, with an excellent linearity of the collector current in the range of 1. If you have a weekend transistors with a big bett, then the current from the drive transistor is not very large mA, so you don't need to put a stupid horse transistor there. A low-power preservative transistor shows much better results in the quality of meander and distortions than BD and the same "medium-road" due to more linear characteristics at currents mA, high H21E and small interelectrode containers.

Especially good quality increase in the classic scheme of The drive cascade is best: 2SC, 2 sC Try 2SC For a powerful version of the amplifier, two to the parallel IMHO the best for this scheme only need competent installation as RF devices and correction. You need to assemble the JLH layout, leave the T2 transistor without a radiator, through time to measure the output cascade current, and then the T2 transistor heat the soldering iron and measure again.

In the scheme, instead of a bipolar transistor, you can try to put mosphores with a small input capacity for example - IRF Now the voltage on the first transistor collector is less than 2 B, and the Mosfet will be more than 5 B, which will reduce distortion.

Plus - the strengthening of the first transistor will increase due to larger input resistance of the Mosfet, just do not forget to put a resistor with a face value of about ohm.

The first transistor has a small quiet current of 0. Several times and in our forums and on foreign resources I met the statement that the amplifier according to the JLH scheme at the weekend transistors p-N-P structures It sounds much better than on N-P-N. Also, some local guru were seen in fleeting praise. Not so long ago, on the forums, I began to ask questions about this account and reached the Grande type A.

Nikitin, Links and Alex. But it did not receive clear answers, like "God forgive" or "it's all so known," in such a spirit. Foreign comrades were easier, but they did not bother with the justification of the fact - they simply took and turned over, and it turned out to be better and everything! Many foreigners in the forums report that with PNP transistors At the output, the sound is much better.

It is quite possible to try to put on the output of almost all MJ NPN conduction and compare them from Or spend on your home. There is no dispute, the sound of them is wonderful, but for everyday use it is easier to use a device on transistors. Transistors are more convenient because they do not require warm-up before work and more durable.

Yes, and not everyone will risk starting a lamp SAGA with anodic potentials at V, and transformers for transistor a couple of dozen volts are much safer and just more affordable.

As a schema for playback, I chose a scheme from John Linsley Hood , taking copyright parameters in the calculation of the impedance of its columns of 8 ohms.

The classic scheme from the British engineer, published almost 50 years ago, is still one of the most reproducible and collects exclusively about himself. There are many explanations for this: - The minimum number of elements simplifies installation. It is also considered that simply design , the better the sound; - despite the fact that weekend transistors are two, they should not be sought in complementary pairs; - 10 watt weekend with a margin enough for conventional human dwellings, and the input sensitivity of 0.

Compared with other classes will be slightly lower. It is possible on conventional diodes or even ready-made bridges, but then they must be shunting capacitors, and the voltage drop on them is greater.

After the bridges are CRC filters from two capacitors of 33, Igf and between them a resistor 0. If you take less and container, and the resistor, the CRC filter will become cheaper and is heated less, but the pulsation will increase, which is not Comilfo.

These parameters, IMHO, are reasonable from the point of view of the price-effect. The filter resistor needs a powerful cement, with a sheek current to 2a, it will dispel 3 W heat, so it is better to take with a reserve of W.

The remaining resistors in the 2 W power scheme will be quite enough. Next, go to the boost of the amplifier. A bunch of ready-made whales is sold in online stores, but no less and complaints about the quality of Chinese components or illiterate wiring on boards.

Therefore, it is better for himself, under the same "scatter". I made both channels on a single layer to then attach it to the bottom of the housing. Starting with test elements:. Weekend transistors are mounted on radiators, it is slightly lower. To the author's scheme from the original article need to make such remarks:.

Not everyone needs to immediately spread tightly. Resistors R1, R2 and R6 are better to first put rapidly, after all adjustments to fall, measure their resistance and solder final constant resistors with similar resistance.

Setup is reduced to the following operations. In one of the channels I did not have com, so it is better to take these tricks with a margin. Then with the help of R1 and R2 maintaining their approximate ratio! Cleaning current is exhibited - we put the tester for measurement direct current And measure this very current at the Power Power Input Point.

I had to significantly reduce the resistance of both resistors to obtain the desired reservoir. The rest of the amplifier in the class A maximum and in fact, in the absence of an input signal, everything goes into thermal energy.

For the 8-ohm columns, this current, according to the author's recommendation, should be 1. Since the current setup may take several minutes, then the weekend transistors must already be on cooling radiators, otherwise they will quickly overheat and die.

For they bask basically. It is possible that in the order of the experiment, it will want to compare the sound of different transistors, so it is also possible to leave the possibility of a convenient replacement. I tried at the entrance 2n, CT and BCC, there was a small difference in favor of the latter. Although all of the above transistors are very good, and the difference may be more subjective.

At the output, I put 2N at once St Microelectronics , as they like many. When adjusting and understating the resistance of the amplifier, the frequency of the CBC can grow, so it is better to use 5.

On the network, the Russian picture scheme "Ultra-linear amplifier class A" is still walking, where this capacitor is generally proposed as 0. I myself made the body from the plexigla. Painted on the back of the plexiglass looks very beautiful. Now it remains only to collect everything and enjoy the music Oh yeah, with the final assembly, it is still important to minimize the background correctly divorce the land.

As it was clarified over decades to us, C3 must be attached to the signal ground, i. To minus entrance, and all other minuses can be sent to the "star" near the filter capacitors. If everything is done correctly, then no background is not to hear, even if the ear to bring the ear on the maximum volume. Another "earthy" feature, which is characteristic of sound cards, not unleashed with a computer galvanically - this is a disturbance with a motherboard that can crawl through USB and RCA.

Judging by the Internet, the problem occurs often: in the speakers you can hear sounds hDD works , printer, mice and background BP Systemsman. In this case, the easiest way to break the earthen loop, taking the ground with a heating on the amplifier fork. There is nothing to fear here, because There will be a second grounding circuit through a computer. The volume control on the amplifier I did not do, because it was not possible to get any high-quality ALPS, but I did not like the rustling of Chinese potentiometers.

The more regulator in the external sound card Always at hand, and every program also has a slider. The volume controller is not only at the vinyl player, so for listening to it, I attached an external potentiometer to the connecting cable. As a source of the signal, we will use the alternator with a tunable output resistance from ohms to Thus, when testing VC at the maximum output resistance of the generator The main types of composite bipolar transistors BT are shown in Fig.

Most often in the VC used with the steel transistor of the Darlington Fig. Unlike the Shiklai transistor, in this transistor, thanks to the "current mirror" of the current of the collectors of both transistors VT 2 and VT 3 almost the same. Sometimes the shiklay transistor is used with a transmission coefficient greater than 1 Fig.


50WQ Semiconductors Discretes

Also See for CA Owner's manual - 16 pages. Table Of Contents. Table of Contents. You should check all pin combinaisons, as there is a chance that only one side of the transistor is short. Blown output transistors should.

1 system, widely used in commercial applications as an amplifier for computers, very similar to the circuits from the hitachi MosFet application manual.

Amplificador Crown 2402 Manual


The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instructions. For product assistance or to order replacement parts please contact your nearest service center always quoting the unit serial number. Phone: E-mail: cservice classeaudio. The use of generic parts may void the warranty of. There may be a delay in processing incomplete requests. Please be sure to include all required information. When receiving a unit, an assiduous visual inspection must be performed.

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mj21193 amplifier instruction

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The reason I ask is the power transformer, it's only VA. Transformer should be stronger and to about 1.

GFA-565 and GFA-585 Circuit Board replacement notes


Crown amps, transistor replacement long. Hi all, I am new to this forum and so far it seems very interesting. I often have to service Crown amplifiers and I wonder if anybody knows for sure what output devices are used. Anybody can tell me what motorola onsemi device his hidden behind these strange numbers? Another question: I see from the datasheet that the MJ have basically the same specs, except for a slightly higher gain and SOA, than the MJ, but one says uses the "perforated emitter technology" while the second are "powerbase" Anybody can shed some light on this?

Marantz 250M

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(Toshiba) and best final devices are MJ+MJ or MJ+MJ Back to Top Do you have service manual for this amplifier?

Classe Audio CA-301 Service manual

Be prepared for a lot of work! But it is very satisfying, like a big puzzle, and the result is a truly spectacular amplifier. A variac is pretty much essential for powering the amp up the first time.

Output Transistors Testing And Replacement - Classe Audio CA-300 Service Manual

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Popular Circuits Page - Page This circuit generates a square-wave which is useful as a clock signal or AC drive for the excitation of sensors. The 2N Amplifiers. This amplifier is used anywhere an IF amplifier is needed. W6BKY has a receiver article at Hamradio-online that shows how to build this circuit on a For negative modulation standards only.

Originally Posted by rsavas.

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I am looking for a watt amplifier which can be run at 1 ohm. I have been looking at the SAZD. I have also caught wind of the Mb Quart onx Hypnotic HYP Database contains 1 Hypnotic HYP

EUR The Musical Fidelity M6CD is a fine performer with a powerful yet refined sound that will appeal to many. Plenty of weight and a smooth tonal character, but could be better balanced. A forward-looking product with a refined sound — but it could do with a little more sonic sparkle.




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  1. Danaus

    Wacker, it seems to me a great idea

  2. Macnicol

    Nothing special