Copper Lugs,Copper Cable Lugs,Plating Copper Cable Lugs,Copper Tube Terminal Lugs Taixing Longyi Terminals Co.,Ltd. , https://www.longyicopperterminals.com
The power amplifier IC uses TDA1521. When the power supply voltage is ± 16V, the output power is 12W & TImes; This circuit is equipped with equal loudness compensation circuit to improve the high and low bass effect at low volume. W is a double-connected eight-pin potentiometer with center tap, which is connected with C1, R1 and C2 to form an equal loudness control circuit. The circuit diagram is shown below.
Production notes: 1. The heat sink of TDA1521 must not be grounded, otherwise the IC will be damaged after starting! Mica sheet insulation should be added between the IC and the radiator, and an appropriate amount of thermal grease should be added, and then the radiator should be grounded. 2. Potentiometer W resistance value is 100kΩ, and its shell needs to be grounded. 3. The power connection between the ⑤ and ⑦ pins from the filter capacitor to the IC should be as short and thick as possible, and a layer of tin can be stacked on the copper foil of the printed board.
After the production is completed, test the sound, turn the volume potentiometer to the maximum, and close to the speaker can hardly hear noise. Using a CD player to test, when connected to a floor speaker, compared with the pioneer M-850 power amplifier, the sound quality is satisfactory except for the slightly lower power, and the vocal performance is very clear and unambiguous.
Shen Yujun, Hunan 
The power amplifier has few components, simple production and good sound quality, and is very suitable for being installed in an active speaker. The effect is ideal and the cost is low, suitable for beginners.