# ecualizador v1 ## Description Stereo 3‑Band Active Audio Equalizer and Mono Preamplifier using TL072 and LM386 with Right‑Angle PCB‑Edge CUI SJ1‑3535NG TRS Jacks for Jack Sensing and Routing ## Project Details - **Owner:** gatowo - **Created:** 12/24/2025 - **Last Updated:** 1/8/2026 - **Visibility:** Public - **License:** https://creativecommons.org/licenses/by/4.0/ - **Jack Orientation:** right-angle PCB-edge - **Switch Count:** tip-and-ring - **System Architecture:** flowchart TD A["Input Jacks"] --> B["Stereo-to-Mono Mixer"] B --> C["Three-Band Filters"] C --> D["Summing Inverter"] D --> E["LM386 Power Amp Stage"] subgraph PWR["Power Rails"] V12P["+12 V"] V12N["-12 V"] V5P["+V (LM386)"] end V12P --> C V12N --> C V12P --> D V12N --> D V5P --> E - **Domain:** Consumer Electronics - **Same Jack Model:** yes - **Operating Voltage:** 12V - **Power Requirements:** Battery ## Key Components ### J1 — [SJ1-3535NG](https://www.flux.ai/vasy_skral/sj1-3535ng~umf.md) - Datasheet URL: https://www.cuidevices.com/product/resource/digikeypdf/sj1-353xng.pdf - Manufacturer Name: CUI Devices - Manufacturer Part Number: SJ1-3535NG - Role: Connector - Part Type: Connector - Role Details: Right-angle PCB-edge TRS jack with tip-and-ring switches for output **Pins:** - ring [pin 3] - ring switch [pin 5] - sleeve [pin 1] - tip [pin 2] - tip switch [pin 4] ### J1 — [SJ1-3535NG](https://www.flux.ai/vasy_skral/sj1-3535ng~umf.md) - Datasheet URL: https://www.cuidevices.com/product/resource/digikeypdf/sj1-353xng.pdf - Manufacturer Name: CUI Devices - Role: Connector - Manufacturer Part Number: SJ1-3535NG - Role Details: Stereo TRS jack with two switches - Part Type: Connector **Pins:** - ring [pin 3] - ring switch [pin 5] - sleeve [pin 1] - tip [pin 2] - tip switch [pin 4] ### J2 — [SJ1-3535NG](https://www.flux.ai/vasy_skral/sj1-3535ng~umf.md) - Manufacturer Name: CUI Devices - Role Details: Stereo TRS jack with two switches - Datasheet URL: https://www.cuidevices.com/product/resource/digikeypdf/sj1-353xng.pdf - Part Type: Connector - Role: Connector - Manufacturer Part Number: SJ1-3535NG **Pins:** - ring [pin 3] - ring switch [pin 5] - sleeve [pin 1] - tip [pin 2] - tip switch [pin 4] ### J2 — [SJ1-3535NG](https://www.flux.ai/vasy_skral/sj1-3535ng~umf.md) - Datasheet URL: https://www.cuidevices.com/product/resource/digikeypdf/sj1-353xng.pdf - Manufacturer Name: CUI Devices - Role Details: Right-angle PCB-edge TRS jack with tip-and-ring switches for input - Role: Connector - Manufacturer Part Number: SJ1-3535NG - Part Type: Connector **Pins:** - ring [pin 3] - ring switch [pin 5] - sleeve [pin 1] - tip [pin 2] - tip switch [pin 4] ### U1 — [TL072IP](https://www.flux.ai/lcsc/tl072ip~xeql.md) - Manufacturer Part Number: TL072IP - Part Type: FET InputAmplifiers - Package or Case Code: PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL - JLCPCB Part Class: Extended Part - Manufacturer Name: TI(德州仪器) - Role: Amplification - Product Info Url: https://lcsc.com/product-detail/FET-InputAmplifiers_TI_TL072IP_TL072IP_C110329.html - Package: PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL - Absolute Maximum Supply Voltage: 36V - Role Details: Dual op-amp for three-band filters and summing inverter - LCSC Part Number: C110329 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010301_Texas-Instruments-TL072IP_C110329.pdf **Pins:** - IN2- [pin 6] - IN2+ [pin 5] - OUT2 [pin 7] - VCC- [pin 4] - VCC+ [pin 8] ### U2 — [TL072IP](https://www.flux.ai/lcsc/tl072ip~xeql.md) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010301_Texas-Instruments-TL072IP_C110329.pdf - LCSC Part Number: C110329 - Role Details: Dual op-amp for three-band filters and summing inverter - Role: Amplification - Product Info Url: https://lcsc.com/product-detail/FET-InputAmplifiers_TI_TL072IP_TL072IP_C110329.html - Manufacturer Name: TI(德州仪器) - JLCPCB Part Class: Extended Part - Package or Case Code: PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL - Package: PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL - Absolute Maximum Supply Voltage: 36V - Part Type: FET InputAmplifiers - Manufacturer Part Number: TL072IP **Pins:** - IN2- [pin 6] - IN2+ [pin 5] - OUT2 [pin 7] - VCC- [pin 4] - VCC+ [pin 8] ### U3 — [LM386](https://www.flux.ai/miguelm/lm386~0o.md) - Package: DIP-8 - Absolute Maximum Supply Voltage: 22V - Role: Amplification - Role Details: Audio power amplifier stage **Pins:** - Bypass [pin 7] - G1 [pin 1] - G8 [pin 8] - GND [pin 4] - In- [pin 2] - In+ [pin 3] - Vout [pin 5] - Vs [pin 6] ### U3 — [LM386](https://www.flux.ai/miguelm/lm386~0o.md) - Role Details: Audio power amplifier stage - Role: Amplification - Package: DIP-8 **Pins:** - Bypass [pin 7] - G1 [pin 1] - G8 [pin 8] - GND [pin 4] - In- [pin 2] - In+ [pin 3] - Vout [pin 5] - Vs [pin 6] ### U4 — [TL072IP](https://www.flux.ai/lcsc/tl072ip~xeql.md) - Package or Case Code: PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL - JLCPCB Part Class: Extended Part - Manufacturer Name: TI(德州仪器) - Manufacturer Part Number: TL072IP - Part Type: FET InputAmplifiers - Absolute Maximum Supply Voltage: 36V - Role Details: Dual op-amp for three-band filters and summing inverter - LCSC Part Number: C110329 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010301_Texas-Instruments-TL072IP_C110329.pdf - Product Info Url: https://lcsc.com/product-detail/FET-InputAmplifiers_TI_TL072IP_TL072IP_C110329.html - Role: Amplification - Package: PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL **Pins:** - IN2- [pin 6] - IN2+ [pin 5] - OUT2 [pin 7] - VCC- [pin 4] - VCC+ [pin 8] ### U5 — [TL072IP](https://www.flux.ai/lcsc/tl072ip~xeql.md) - Manufacturer Part Number: TL072IP - Part Type: FET InputAmplifiers - Role: Amplification - Package or Case Code: PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL - JLCPCB Part Class: Extended Part - Manufacturer Name: TI(德州仪器) - Product Info Url: https://lcsc.com/product-detail/FET-InputAmplifiers_TI_TL072IP_TL072IP_C110329.html - Absolute Maximum Supply Voltage: 36V - Role Details: Dual op-amp for three-band filters and summing inverter - Package: PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL - LCSC Part Number: C110329 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010301_Texas-Instruments-TL072IP_C110329.pdf **Pins:** - IN2- [pin 6] - IN2+ [pin 5] - OUT2 [pin 7] - VCC- [pin 4] - VCC+ [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/gatowo/ecualizador-v1~ug](https://www.flux.ai/gatowo/ecualizador-v1~ug).* --- *Generated from [https://www.flux.ai/gatowo/ecualizador-v1~ug](https://www.flux.ai/gatowo/ecualizador-v1~ug)*