Refer-Grado PH-1 Dual OP Phono Amplifier Board MM RIAA AC15-0-15V (Finished Board)

（1）.Tech highlights: Dual op amp design, can replace different op amps to present different sound performance.PCB SIZE: 76x93x1.6mm 1oz Cu, HASL with lead. Power requirements: Best:AC15-0-15V@0.4A（2）.Product configuration: DIY kit: Contains the PCB and the components needed on the PCB, but does not include the power transformer .  Finished board: Based on the well-tested board on the standard version kit, we verified all key points' voltage, and used the signal generator and oscilloscope for analog waveform double verification. We will not use this board for listening test.  （3）.Schematic & key point of debugging: 1.PCB comes with component parameters for easy installation. 2.Please keep test point voltage close enough to it, +-20% is also permitted（4）.DIY KIT Instructions Since the PCB holes are plated through, you only need to solder the parts from the bottom of the board. Do not drill or enlarge the holes because that would damage the through-plating.Clean both sides of the blank PCB with paper towel and isopropyl alcohol or electronics flux remover, then solder the components to the board, starting with the lowest profile parts.Make sure the correct part goes into each position on the circuit board. Measure each resistor with your multimeter to ensure it's the proper value.Clean up the solder flux residue from the board with isopropyl alcohol (or electronics flux remover) and a brush.nspect all solder connections carefully, using a magnifying glass, to make sure there are no solder bridges or cold solder joints. Use a multimeter in ohms scale to check for short circuits. As a minimum, you should verify that the V+ DC are not shorted to ground, or to each other, and that the output pad isn't shorted to ground. Correct any mistakes before proceeding to the next phase.

• Dual op amp design, can replace different op amps to present different sound performance.
• Power requirements: Best:AC15-0-15V@0.4A
• all-in-one design, single-point grounding, ground resistance is close to the 0.02 ohm resistance value, low noisedesign
• Dual op amp design, can replace different op amps to present different sound performance.