A1 Preamp TL084PCB Board For Musical Fidelity

• Size: 32*87mm
  Using Texas Instruments TLO84, JFET input, the voltage control device works like a tube amplifier,

  1: Use a bit of grounding wiring, the sound is transparent and natural, and the noise floor is almost zero even with 22OUF filtering.

  2:A1 uses TLO84 quad op amp, JFET input,

  4: After measuring the original machine, the front part is positive and negative 9V, so see 7812, 7815, the board ratio is larger, the capacitance is larger than the appearance capacity, the circuit board is gold-plated A1 can not be considered

• 1: Use 3-wire AC input, voltage 12-15v, no more than 18v, and power greater than 10 watts.
  2: Some customers have responded that the handle is short, and the spot has been updated to a domestic high-quality potentiometer with a handle of 20MM.
  3: Regarding the negative problem of the three-terminal voltage stabilizer, the reason is that the 7809 and 7909 are installed in the wrong position. After the correction, the customer cannot accept that he is wrong, so he consciously pursues the review, and does not rule out the possibility of affecting other people's business. I hereby declare, The standard of the circuit board is completely correct, and it can be welded according to the silk screen parameters. Note that 7809 and 7909 cannot be welded wrongly. At the same time, we also urge the fans with weak foundation not to buy spare parts, empty boards, and choose the finished products directly.