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Mini Phono EQ

Miniature Phono Equalizer

elehobicaElehobica
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Mini Phono EQ project suggests an idea for manufacturing RIAA Phono Equalizer in miniature size by hand made.

Main circuit of RIAA Phono Equalizer for MM cartridge is based on the reference circuit on LME49721 data sheet.
Rail Splitter circuit is for positive/negative power supply, which provides more stable power than voltage divider by resistors.
5V Power supply is supposed since the maximum power voltage of LME49721 is 5.5V from V- to V+ is 5.5V.

Making use of pitch conversion PCB from 1.27mm to 2.54mm allows us to implement peripheral parts with SOP8 OP Amps in a small size factor.

Mini_Phono_EQ_Schematic.pdf

Schematic

Adobe Portable Document Format - 18.06 kB - 02/18/2021 at 12:11

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Mini_Phono_EQ_parts_layout_rail_splitter.jpg

Parts Layout Diagram (Rail Splitter part)

JPEG Image - 89.08 kB - 02/15/2021 at 12:31

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Mini_Phono_EQ_parts_layout_main.jpg

Parts Layout Diagram (Main part)

JPEG Image - 124.15 kB - 02/15/2021 at 12:30

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  • 1 × LME49721 Operational Amplifiers
  • 1 × ADA4075-2 Operational Amplifiers
  • 2 × SOP4 28pin 1.27mm PCB

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