Follow WeChat Download Audiophile APP Follow the audiophile class related suggestion This article mainly introduces the dual power supply automatic switching circuit diagram (TDA2030 / power amplifier / dual power supply circuit). In the power amplifier circuit ... The power amplifier circuit that omits the output transformer is usually called an OTL (Output TransformerLess) circuit. In the field of audio, people have always maintained the position of Class A amplifiers. It is considered that the sound of Class A amplifiers is the most fresh and transparent, with high fidelity. However, Class A ... The amplifier has AC amplifier and DC amplifier. AC amplifiers can be divided into low frequency, medium source and high frequency according to frequency; the output signal strength is divided into voltage amplification ... In the picture, IC1 and IC2 are two sets of LM386, which are connected into OCL circuit. C1 plays the role of power supply filtering and decoupling, C3 is the input coupling ... RF LNA design requirements, low noise amplifier (LNA) as the first stage of the RF signal transmission link, its noise figure characteristics determine the entire radio ... Radio frequency refers specifically to electromagnetic waves with a certain wavelength that can be used for radio communications. The high-frequency circuit used to generate radio frequency becomes a radio frequency circuit, which is basically composed of passive components ... The self-bias circuit is relatively simple, but when the static operating point is determined, VGS and ID are determined, so the range of R selection is very small. 6L6 is a beam power tube with cathode, control grid, curtain grid, suppression grid and anode. The suppression grid is actually lifted by two bunching plates ... The TDA2030A power amplifier board is powered by an attenuating tone control circuit and a TDA2030A amplifier circuit and power supply controlled by high and low ... However, in some cases, when the load is a resistor, its characteristics must be studied. The use of high-power potentiometers may be a high-cost solution without cost-effective ... As shown in the figure is the auxiliary audio power amplifier circuit of LM4730. The audio input signal is added to the LM47 through the potentiometers Rv, CIN, RB ... Hearing aid (Hearing Aid) is a help hearing impaired people to improve hearing impairment, and thus improve the ability to communicate with others ... Here is a BTL power amplifier circuit without debugging, high fidelity, and low cost, and you can choose the final power amplifier integration according to your own situation ... This circuit is an OCL power amplifier circuit composed of a low-power integrated power amplifier LM386. The circuit structure is simple, easy to debug, and very suitable for self-made ... Cats are the natural enemies of mice, and it is an effective method to use electronic devices to simulate the sound of cats. Because it is an electronic device, the meow sound can be large or small, fast or ... The light-controlled street lamp circuit is composed of a power circuit and a light-controlled circuit. The power circuit is composed of a power transformer T, a rectifier diode VDl-VD4 and a filter capacitor ... The TDA2030A power amplifier board is powered by an attenuating tone control circuit and a TDA2030A amplifier circuit and power supply controlled by high and low ... The speaker amplifier, gyroscope, compass and other circuits of the Apple iPhone 4S mobile phone are amplified by the speaker audio power chip U702 (T ... The wireless energy transfer charger transmits the power wirelessly to the bulb (battery) through the coil. The wireless energy transfer charger is composed of energy sending unit and energy receiving ... The small power amplifier made with TDA2009A introduces a 10 + 10W stereo amplifier made with TDA2009A power amplifier integrated circuit ... LM1877 is a single-chip dual-channel audio power amplifier, each channel can output 2W continuous average power, driving 8Ω load, requiring few external elements ... LM386 is a universal power amplifier circuit. Circuit principle: POWON-HE328 50W * 2 Class A push-pull power amplifier to ground, refer to the HARMAN / K ... The compact disc player, pure power amplifier and high-fidelity speakers are the most basic combination of sound. For general working-sound audio enthusiasts, the price is more expensive This circuit is composed of simple components and the structure is easy to understand. Hi-Fi power amplifier circuit (with BOM) This is a simple low success rate amplifier. There are 5 ways you can complete her, just like a chart ... The circuit of the power amplification stage of the ZM312 12-channel carrier line amplifier is shown as the ZM312 12-channel carrier line amplifier ... What is a power amplifier? In communication equipment, the last stage of a multi-stage amplifier always carries a certain load, for example, to make the speaker emit sound, ... Transistor power amplifier circuit: the picture shows the power amplifier circuit matched with the electronic piano TDA2616 power amplifier circuit diagram TDA1514 power amplifier circuit diagram TA8223 / TA8223K dual-channel power amplifier circuit TA7270 / TA7270P power amplifier circuit Typical OTL power amplifier circuit diagram Introduction of LM386 Audio Power Amplifier LM386 is an audio power amplifier produced by National Semiconductor, mainly used in low voltage consumption ... Push-pull power amplifier circuit diagram Power amplifier interface circuit Class B push-pull power amplifier The power amplification (referred to as power amplifier) ​​circuit in the general audio-visual circuit is after the voltage amplifier, the low ... '+ data.data.username +' '; dom + =' Integrated Led Lamp,Integrated Led Lights,Integrated Panel Lamp,Integrated Led Ceiling Lights Changxing Fanya Lighting Co.,Ltd , https://www.fyledlights.com The power amplifier tube is a key device in the audio power amplifier, and now compares the genuine product with the fake one.
1. Judging from the printed fonts: the authentic fonts are well-proportioned and beautiful, and the writings are not easy to be wiped off, while the fonts of the fakes are as written, and gently rubbing with your fingernails will make the writings lighter in color or even invisible.
2. From the imprint of the package pressing: English letters and numbers are printed on the two sides near the solid screw hole near the upper part of the tube, and the words of packages from different manufacturers or countries are printed in the middle near the lower pin, such as SK (Sanken) , PHILIPPINES (Philippines), Mallaysia (Malaysia), etc. The fakes are not printed, or the two points on the top are bloated and ugly, and the bottom point is not printed because of the word position. Of course, there are also some joint ventures that have no printing here, but other aspects are not significantly different from the original.
3. From the point of view of the packaging and processing technology of the power amplifier tube: the boundary between the heat sink and the plastic of the genuine product is clear, the edges are flat, and the boundary of the fake is not clear and even has gaps (the market is the easiest The fakes I saw were the small Toshiba tubes A1491 / C5198 and D817 / D1047), but the surface was rough like brushed (this is the place where the fakes are most exposed). Some models of imported tubes have a finned surface on the surface of the fins (such as MJOL1302A / MJL32281A from Matalola), while fakes and individual joint ventures do not have this process.
4. Judging from the measurement results: when measuring the forward and reverse resistance between the c and e poles of the tube with a pointer multimeter R × 10k, the genuine pointer is fixed at ∞ or the swing angle is very small, while the fake c , E-pole forward resistance (NPN forward is Rce, PNP forward is Rec), the swing angle is much larger, that is, the resistance value is smaller (this indicates that the penetration current of the tube is larger); and the tube is measured with a digital multimeter When the magnification is β, the consistency of genuine products (especially imported tubes) is very good, while the consistency of fake products is generally poor.
5. The performance of the fake installation machine: because the pressure resistance of the tube is generally low, it is easy to cause the tube to burn out at startup; or the heat is more serious than the original product, and the resistance of the c and e poles of the tube is much smaller than that when it is not installed , And the deviation of β is greater, the genuine product has no such phenomenon. 
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