PASS ALEPH J AJ Single ended Class A HIFI DIY finished amplifier board

Product Details:

The circuit structure is basically the same as the pass am A3, except that Toshiba transistors such as K170 or J74 are used as input transistors, which have better analytical power and details, and better high-frequency performance. In addition, the midpoint voltage of the switch is low, and there is almost no impact problem.

Supports balanced input or single ended input.

During installation and debugging, be sure not to connect the positive and negative wires incorrectly. After installing the heat sink, measure whether the transistor casing is insulated from the heat sink. If there is a short circuit problem, it needs to be rechecked. It is best to connect a 100 watt incandescent bulb in series with the live wire of the transformer before powering on to prevent accidental operation. The midpoint voltage basically does not need to be adjusted. Within 50MV, adjust the potentiometer in the middle of the board for static current. Measure the voltage on both sides of the high resistance and divide it by the resistance value of 0.47. Generally, setting it between 0.5-1A is sufficient. If there is no abnormality in the output midpoint voltage, the signal can be tested for sound.