STK3048 + STK6153 Modul Power Amplifier

Figure principle of good restructuring. The amp features:

1. Changed the top, replacing self-made Indian plate of trouble. 
2. DC servo output DC-to mid-point of maintaining zero. 
3. No major negative feedback loop to improve transient response with the sound reduction. 
4. STK6153 quiescent current, improve the quality significantly. 

Conversion methods and Attention:

1. Market sale of the original board have two to 10 watts of white resistance big distinction between the resistance, for a 0.39 Ω (such boards of 220 μ F/50V filter capacitance larger), another for 0.25 Ω (this Board of the filter capacitance smaller), the purchase of 0.39 Ω to the board restructuring. 
   
2. Reservations R4, R5, R6, R17, R18, R21, R22, 10 watts and the resistance C8, C9, C11, C12, C13, C14, D1, D2 fixed, and the remaining resistance capacity of all removed.
   
3. Chanduan the Indian board a copper foil, the bottom plate of the socket A5 and even the A8, short of the ec to a transistor, the board R16, C6 right end spot link, C2R1 linked to extreme left spot. 
   
4. (3048) from 15 feet to 13 mm left horizontal drilling two holes through the bottom of the copper foil (this is the copper foil-to 1 (6153)) 4 (feet and legs in order to legislate with R7, R8 used. 5 . C1 welding on the bottom plate, and the remaining parts of the whole welding on the board, R3 vacant welding. R2 position not free to move, otherwise self-excited. C4 value from 33 ~ 100 pF, not in self-under the premise of the less the better . 6. R11, R12 not to equipment, welding parts accurate completion of inspection, the power is in the Ammeter-string detection, the current 50 mA for about (± 40V) and stability, the midpoint of DC output voltage should be zero, such as The overall current超过70 mA, there Self-Help, need to increase the value of C4, normal with Uehara radiator 7. Preview the speaker, no signal, the speaker should be close to the ear can not hear the background noise. When the 100 k Ω Potentiometers Open until half time, the voice is very loud. Removal of Speaker and input, string-Ammeter measuring the total current, change R11, R12 resistance (this should be the two resistance value) to the current raised to 150 ~ 200 mA to within (The 6153 block of the resistance are not as available 200 ~ 330 k Ω resistance within the scope of debugging), to maintain the current five minutes will be a slight decrease, the midpoint of DC output voltage should be zero, to be normal. With the entire cooling For.