Pass Circuit SMT Phono Pre- Amplifier(RIAA) Finished Board

DIY KIT Project

To complete this project, high level knowledge of electronics and rich experience in terms of soldering and testing are required.

Due to time zone and language communication restrictions, we can only provide limited technical support, and you need to solve problems by yourself.

We do not provide information other than the product introduction page.

Pass Circuit SMT Phono Pre- Amplifier(RIAA) Finished Board Project

It is based on the core circuit of the PASS ALEPH ONO Phono Pre- Amplifier.

Tech highlights:
Two-stage buck regulator filter,Two low-pass filter (with a corner frequency of 1.6Hz prevents power noise from being introduced into the amplifier. Provide purer power supply (close to battery).

Voltage power supply uses MOSFET as pass transistors, which have a sense of tube sound characteristics but rejecting the rectification and regulation noise.

voltage soft-start feature is included which will take about 5 second to reach the designed voltage .

all-in-one design, single-point grounding, ground resistance is close to the 0.02 ohm resistance value, low noisedesign.

More cost-effective sound modification plan.

Fully Discrete AMP.

JFET input has high input impedance and low noise characteristic.

The output stage is a complementary push-pull design featuring MOSFETs.

Pure class A operation.

Input Resistance: 47K

PCB SIZE: 141x106x1.6mm 1oz Cu, HASL with lead

Power requirements:
AC 28-0-28; I=0.3A or AC 30-0-30; I=0.3A

Product configuration

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.

Schematic

Pics