Diy RIAA Phono Preamp circuit with opamp

diy riaa phono preamp

Diy RIAA Phono Preamp circuit with opamp It’s a phono preamp based on the design of rod ellion ( ituses a 12-0-12 transformer, 1VA or above, it doesn’t really matter.

It really sounds great, in a metal box with some high-end stickers on it, audiophiles won’t tell it apart from a $300 brand product. it used BNC’s for connecting a turntable, audio gear should always use BNC or XLR.

About diy RIAA Phono Preamp

The Recording Industry Association of America (RIAA) Phono Preamp is a device that plays a crucial role in the world of audio reproduction and music preservation. Designed to enhance the quality and accuracy of vinyl record playback, this preamplifier is an essential component in any audio system that includes a turntable.

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Vinyl records, with their unique sound and nostalgic appeal, have experienced a resurgence in popularity recently. However, the process of playing vinyl records requires a specialized approach due to the way the music is physically stored on the grooves of the record. The RIAA Phono Preamp serves as a bridge between the turntable and the audio system, ensuring that the delicate signal from the stylus is properly amplified and equalized to reproduce the original recording faithfully.

The primary function of the RIAA Phono Preamp is to correct the frequency response of the audio signal, which is intentionally altered during the recording process. To fit more music onto a vinyl record, the low frequencies are reduced, while the high frequencies are boosted. This equalization curve, known as the RIAA curve, is applied during the mastering process and needs to be reversed during playback to accurately reproduce the original sound.

The RIAA Phono Preamp accomplishes this by amplifying the weak signal from the turntable’s cartridge and applying the inverse of the RIAA curve. By boosting the low frequencies and attenuating the high frequencies, the preamp restores the audio signal to its original form, allowing the music to be heard as intended by the artist and the recording engineer.

In addition to equalization, the RIAA Phono Preamp also provides the necessary gain to bring the signal up to line level, making it compatible with other audio components in the system. This ensures that the music can be played back at a suitable volume without any loss of fidelity.

Modern RIAA Phono Preamps often come equipped with additional features, such as adjustable gain, cartridge loading options, and various connectivity options to accommodate different types of turntables and audio systems. These advancements have made it easier than ever for audiophiles and music enthusiasts to enjoy the rich, warm sound of vinyl records while maintaining the highest level of audio quality.

In conclusion, the RIAA Phono Preamp plays a vital role in the world of vinyl record playback, ensuring that the music is faithfully reproduced and enjoyed by audiophiles and music lovers alike. By correcting the frequency response and providing the necessary amplification, this device preserves the integrity of the original recording, allowing for a truly immersive and captivating listening experience.

riaa phono preamp schematic diy riaa phono preamp

Riaa Phono Preamp Power Supply Schematic
Riaa Phono Preamp Power Supply Schematic
Riaa Phono Preamp Power Supply Schematic
Riaa Phono Preamp Power Supply Schematic

BOM preamp RIAA phono preamplifier

Name Designator Footprint Quantity
Resistors 1/4W 1%
2.2k R5,R6 Red, red, black, brown, brown 2
47k R7,R8 Yellow, violet, black, red, brown 2
4.7k R9,R14 Yellow, violet, black, brown, brown 2
180k R10,R13 Brown, gray, black, orange, brown 2
10k R11,R12 Brown, black, black, red, brown 2
2.7k R15,R16 Red, violet, black, brown, brown 2
100k R17,R18,R21,R22 Brown, black, black, orange, brown 4
750 R19,R20 Violet, green, black, black, brown 2
1k R1,R2,R3,R4 Brown, black, black, broom, brown 4
1.5k R23 Brown, green, black, orange, brown 1
0 R24 0 ohm 1
1N4448 D1,D2,D3,D4 DO-35 – Diode 4
204-10SURD/S530-A3 LED1 LED-3MM 1
7815 U1 TO-220-3 – 15V voltage regulator positive 1
7915 U2 TO-220-3 – 15V voltage regulator negative 1
NE5532P U3,U4 DIP-8 – Operational amplifier 2
100u/25V C1,C2,C17,C18 Electrolytic capacitor 4
1000u/25V C7,C8,C13,C14 Electrolytic capacitor 4
10000u/25V C9,C11,C10,C12 Electrolytic capacitor 4
22n C21,C23 Ceramic capacitor 2
22u/25V C22,C24,C25,C26 Electrolytic capacitor 4
100n C27,C28,C5,C6,C19,C20 Ceramic capacitor 6
1u C29,C30,C3,C4,C15,C16 Ceramic capacitor 6
Header-Female-2.54_1×2 P1,P2,P3,P4 HDR-1×2/2.54 4
Header-Male-2.54_1×3 H1 HDR-TH_3P-P2.54-V 1


Download files, PCB in PDF, Gerber



References, Links, and Notes
  1. NE5532x, SA5532x Dual Low-Noise Operational Amplifiers datasheet (Rev. J)
  2. The Signal e-book: A compendium of blog posts on op amp design topics


moving magnet RIAA phono preamplifier

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About the author blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.

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