1. LM1875 is a mono 20W audio power amplifier chip, which can provide no less than 20W power output when the power supply voltage is DC±25V and the load impedance is 4Ω. The following is its typical application circuit diagram in dual power supply mode.
2, first open the Start menu on your computer, find and open the "Control Panel" option. Then in the Control Panel window, there is a "sound" option, left click on this option. After opening "Sound" comes out the following window, windowThere is a "playback" on the top menu, and a "speaker" below the playback, and the left mouse button click on "speaker".
3, do the amplifier integrated block, 15v AC rectifier filter after 15x4 = 21v DC voltage, slight fluctuations in the external power, 2030 immediately damaged, that is, double 21v power supply 2030 May also be immediately damaged. Use LM 1875 as the amplifier block. The integrated block is the same as the 2030, it is also 5-pin, 20W power, and 30V voltage, which is far from comparable to the 2030. Two pieces for the left and right channels, one piece for the subwoofer is enough.
4, D718/B688 is a 120V 8A 80W audio power tube, commonly seen in audio post-level power amplifier. The following are D718/B688 application circuits, please adopt.
5, I gave you a circuit, can be called a power amplifier circuit. (For the simplest single tube amplifier circuit can only be an amplifier circuit, but there is no power amplification function.) The power supply voltage is 3-6V. Circuit debugging: Just adjust the resistance R2 so that the QQ3 midpoint voltage is near 1/2 of the power supply voltage.
6, triode, the full name should be semiconductorTriode, also known as bipolar transistor, crystal triode, is a semiconductor device that controls current. Its role is to amplify the weak signal into an electrical signal with a larger amplitude value, and is also used as a contactless switch. Transistor is one of the basic components of semiconductor, with current amplification, is the core component of electronic circuit.
1, lm1875. The lm1875 amplifier has better sound quality and is very strong, especially in low frequency bands. lm1875One of the most commonly used d1875 power amplifier chip circuit diagram power amplifier chip, for mono design, not only has the advantages of sound quality mellow power, but also has a complete protection circuit with dual channel power amplifier board effect.
2, the origin of different D1875: belongs to domestic products. LM1875: Imported products, origin is the United States, is the United States half company production.
3, Huiwei uses D1875 because LM1875 has long been out of print without real goods, so we have to use this do not know whether it is a joint venture or pure domestic goods. As for the effectThere must be a difference. D1875 I have not used, but D2030A and TDA2030A I have compared, whether it is soft indicators of sound quality or power, pressure resistance index gap is quite large. However, d1875 power amplifier chip circuit diagram Can you really buy authentic LM1875 d1875 power amplifier chip circuit diagram ? I seriously doubt it.
4. LM1875 can directly replace TDA2030. Because of the difference in voltage and output power, the substitution order is: 2030A canReplace 2030,1875 can replace 2030, 2030A. If the reverse order substitution, it depends on whether the voltage and output exceed the rated value. The voltage of LM1875 is lower than that of TDA2030A, and the voltage of LM1875 is ±30V. The speaker you are using is the d1875 power amplifier chip circuit diagram ? If it is 8 euros can also be combined, if it is 4 euros it is best not to.
First open the d1875 power amplifier chip circuit diagram Start menu d1875 power amplifier chip circuit diagram , find and open the "Control Panel" option. Then in the control panel window d1875 power amplifier chip circuit diagram , there is a "sound" option, left mouse click on this option. Open "Sound" after the following window, the menu at the top of the window has a"Play ", there is a "speaker" below the playback, the left mouse button click "speaker".
lm1875 is a power amplifier integrated block! It has few peripheral circuits in use and has perfect overload protection function! Pin function definition d1875 power amplifier chip circuit diagram : It is a five-pin shape. Among them, one pin is the signal in-phase input, two pin is the signal inverting input, three pin negative power supply -Vee (single power grounding GND), four pin is the signal output, and five pin power supply Vcc input.
Your circuitThat's it.
3, different types of music and the difference in the power signal will produce different sound quality effects, so the circuit board also needs to have different in summary: the speaker circuit board is a crucial part of the speaker work, it can convert the electrical signal into a sound signal, and adjust and optimize the volume, equalizer and sound field and other parameters.
4, can not be welded with iron, may be the solder joint is not clean, clean up the solder joint, re-tin, and then weld on the 4007 rectifier diode, before welding in the 4007 wire on both ends of the tin, so it is better to weld. On the otherIt is necessary to find out the cause of the rectifier diode damage, and eliminate hidden dangers to prevent secondary damage.
5, is the power amplifier chip, model TDA2030/UTC2030 is 5-pin. The full name of audio power amplifier is audio power amplifier, which is used to promote the sound of the speaker, so as to reproduce the sound of the power amplifier device, which is used in the electronic products that sound. The basic principle of audio power amplifier Audio power amplifier is actually to amplify the smaller audio signal, increase its power, and then output.
1, D2822 audio amplifier chip pin function diagram: the functions and symbols of the leading end: Package shape diagram: experimental test electrical characteristics: Application diagram: D2822 dual-channel audio power amplifier circuit is used in portable recorders and radio power amplifiers, etc., widely used.
2. Figure 5-107 shows the circuit. With a piece of TDA2822M power amplifier integrated circuit connected to BTL mode, (mono use, stereo to two) peripheral components only one resistor and two capacitors, do not install a radiator, the sound effect is also madeThe integrated block heats seriously.
4, d2822a power amplifier parameters: low working voltage: the lowest working voltage is 8V; Static current and cross distortion are very small, the circuit can work in stereo dual channel, can also be connected to BTL circuit. Stereo operating output power is 1W×2 (Vcc=9V, RL=8Ω, THD = 10%) or 110mW×2 (Vcc=3V, RL=4Ω, THD = 10%).
5, the role is to amplify the power, the term is called power amplifier integrated circuit (integrated circuit) is aA miniature electronic device or component.