Hifivv Audio Upc1342v 150W Mono Hifi Power Amplifier Board For Home Speaker 84×61mm | Theater Amplifiers

Hifivv Audio Upc1342v 150W Mono Hifi Power Amplifier Board For Home Speaker 84×61mm | Theater Amplifiers

Core components: NEC company, following the excellent broadband and low distortion 50W driving circuit upc1225h, in order to meet the requirements of high power, has launched a new generation of audio driver IC -- upc1342v. In addition to all the advantages of upc1225h and basically the same peripheral circuit, the IC has smaller output voltage deviation (plus or minus 5mv), wider voltage adaptability range (plus or minus 20 ~ plus or minus 70V), lower output voltage deviation (plus or minus 5mv) and wider voltage adaptability range (plus or minus 20 ~ plus or minus 70V) Drive power more abundant, can be called the first choice IC of power amplifier made by enthusiasts. Two pieces of upc1342v can be used to form a 2 * 150W power amplifier. The circuit structure is shown in the figure below（ Now the temperature compensation tube is 669

Core components: the new on high power transistor njw0302g / njw0281g is adopted, which has a high test evaluation for the tube. The third issue of radio and TV 2008, a famous audio magazine, is a new R & D and launch of amson. The sound performance of the pair is very similar to njw3281 / njw1302. The sound is very thick and granular, and the density is also very high. However, it feels just right. The sound is more mature, flexible and has a certain sense of moisture and stability, which is quite gorgeous and charming. The performance of the final stage working current is quite consistent when it changes in a large range, and there is no obvious change of timbre due to the size of the working current. The triode parameters: 15a, 250V, 150W.

Circuit of this board: the circuit of upc1342v direct push on high-power tube is adopted. The circuit is simple, stable and the sound is very transparent.

Class a current: when the temperature of transformer and radiator is allowed, try to increase the static current, and feel the moving charm of class a power amplifier (warm, transparent, good control power)! Debugging method of the board: there is an adjustable multi turn potentiometer in the left and right sound channels of the board, which is used to adjust the quiescent current (class a current) of the power tube. After the welding of this board, before the power on, first turn the adjustable potentiometer anticlockwise to the end (at this time, the static current is 0). After the power on test, confirm that there is no problem with the playback, slowly adjust the potentiometer clockwise, and at the same time detect the resistance voltage of 0.22 Ω (for example, when the voltage is 44mv, the static voltage is 200mA, it is also OK to measure the e-pair output of the power tube with the MV gear), so as to adjust the static current to the required value. Note: due to the effect of temperature feedback, as the temperature of the radiator rises, the quiescent current will be pulled down a little, which needs to be tested and debugged for many times.

Recommended voltage: dc25-55v * 2, it is recommended to adjust the quiescent current of each pair of tubes to 100mA;

Output power: according to the different power supply voltage and horn impedance, the output power is 20-150w; When DC 50V power supply, it can output 100W / 8W, 150W / 4W.

Printing plate size: 84 * 61mm; Power tube can be installed horizontally, space compatible with Sanken large tube (such as c2922); Printing plate 2mm thick, 70UM copper foil (copper thickness is the hard truth)

Neutral point voltage: about 1mV;

SNR: 108db, noise level: 0.2mv;