Ingredients:
1. Motorola original disassembly machine MJ2955 (pairing delivery).
2. Hitachi B647, Philips Silver C546 (reverse on the board) do not need to be reversed if they are equipped with 2N2222, 2N5551 and S8050.
3. High-quality ruby electrolytic capacitor 105 degrees: 35V/100UF, 35V/220UF.
4. Now equipped with the new American IC Illinois TTAM series axial capacitance: 35V/2200UF.
5. Vishay VISHAY BC: 1.5UF/160V.
6. Black oil double-sided gold PCB board: 100X75MM.
7. With 40mmX40mmx4mm oxide angle aluminum.
Note: the oxide angle aluminum is different from the angle aluminum in other stores real stuff Looks good (Fixing hole distance: 53MM, aluminum size with angle: 100X80X48mm) Length, width and height.
Matching: Philips Silver C546 board needs to be installed in reverse, such as 2N2222, 2N5551, S8050, do not need to be installed in reverse. The 3296 adjustable resistor is best to use 5K and 200K, which is convenient to adjust the midpoint and quiescent current. (Use the Philips tube, the sound quality is better) The plastic-sealed tube is used, and the op-amp is better than the gold-sealed tube, and the sound quality is inferior
Parameter:
1 .Power supply voltage requirements: DC 12-35V (corresponding to 9-24V transformer) AC must be rectified before it can be connected, beginners pay attention
2. It can drive 3-8 inch unit bookshelf box or full frequency box below 120W, output power: 10-15W.
3. The quiescent current is adjustable from 0.3-1.8A, about 1A is recommended (default 24V800MA for delivery).
4. Midpoint voltage debugging method: multimeter voltage is 20V, black pen is grounded to GND, red pen touches the midpoint test point or the positive pole of the output capacitor 2200UF, and then debugs the 204 (200k) adjustable resistance, so that the measured voltage is the power supply voltage 1/2).
5. Static current adjustment method: the multimeter is in 10A gear, the test lead is always connected to the positive power supply, the other test lead is connected to the VCC terminal, and the 202 (2K) adjustable resistance is adjusted to change the current size.
Recommendation: suitable for listening to 3-8 inches, 4-16 ohms, 20-120W bookshelf box or full-range speakers. It is necessary to use a transformer of 100W or more, and the output AC voltage is between 9-24V. It is recommended to use 18V cattle and filter more than 20000UF.