# EQ Mix Clean Boost Pedal ## Description Through-hole 9V analog guitar stompbox PCB with fixed wet-path EQ, passive dry/wet mix, clean boost, TL074 op-amps, offboard controls, and 100 × 60 mm two-layer layout target. ## Project Details - **Owner:** donpanino - **Created:** 7/12/2026 - **Last Updated:** 7/12/2026 - **Visibility:** Public ## Key Components ### D1 — [1N4007RLG](https://www.flux.ai/jecstronic/1n4007rlg~07j.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1N4007RLG - Datasheet URL: https://www.onsemi.com/pdf/datasheet/1n4001-d.pdf - Manufacturer Name: onsemi - Part Type: Diode - Role: Protection - Role Details: Series polarity protection from offboard 9V input to V9 rail **Pins:** - anode [pin 2] - cathode [pin 1] ### J1 — [Pin Header 01x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role: Connector - Role Details: PWR header: 1=V9 input, 2=GND star, 3=VREF **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J2 — [Pin Header 01x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md) - Role Details: IN header: 1=signal, 2/3=GND - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J3 — [Pin Header 01x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md) - Role Details: OUT header: 1=signal, 2/3=GND - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J4 — [Pin Header 01x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Part Type: Connector - Role Details: MIX header: 1=dry, 2=wiper, 3=wet **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J5 — [Pin Header 01x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connector - Role Details: BOOST header: 1=Rf end, 2=wiper, 3=op-amp output end **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### TP1 — [5002](https://www.flux.ai/cherepanyadima/5002~l4.md) - Role: Test Point - Manufacturer Name: Keystone - Role Details: VREF measurement point, expected about 4.5V on 9V supply - Datasheet URL: https://www.keyelco.com/userAssets/file/K75p62.pdf - Manufacturer Part Number: 5002 - Part Type: Connector **Pins:** - ~ [pin TP] ### U1 — [TL074BCNG4](https://www.flux.ai/lcsc/tl074bcng4~ucnp.md) - LCSC Part Number: C1348503 - Role Details: U1A input buffer; U1B 600 Hz HPF; U1C 800 Hz peak; U1D 1.2 kHz peak - Role: Audio Op-Amp - Manufacturer Part Number: TL074BCNG4 - Manufacturer Name: TI(德州仪器) - Package or Case Code: PDIP-14_L19.3-W6.4-P2.54-LS7.9-BL-1 **Pins:** - 1 [pin 1] - 1 [pin 1OUT] - 14 [pin 4OUT] - 1IN- [pin 2] - 1IN+ [pin 3] - 2IN- [pin 6] - 2IN+ [pin 5] - 3IN- [pin 9] - 3IN+ [pin 10] - 4 [pin VCC+] - 4IN- [pin 13] - 4IN+ [pin 12] - 7 [pin 2OUT] - 8 [pin 3OUT] - VCC- [pin 11] ### U2 — [TL074BCNG4](https://www.flux.ai/lcsc/tl074bcng4~ucnp.md) - Manufacturer Name: TI(德州仪器) - Manufacturer Part Number: TL074BCNG4 - LCSC Part Number: C1348503 - Role Details: U2A 4 kHz LPF; U2B clean boost; U2C output buffer; U2D unused - Package or Case Code: PDIP-14_L19.3-W6.4-P2.54-LS7.9-BL-1 - Role: Audio Op-Amp **Pins:** - 1 [pin 1] - 1 [pin 1OUT] - 14 [pin 4OUT] - 1IN- [pin 2] - 1IN+ [pin 3] - 2IN- [pin 6] - 2IN+ [pin 5] - 3IN- [pin 9] - 3IN+ [pin 10] - 4 [pin VCC+] - 4IN- [pin 13] - 4IN+ [pin 12] - 7 [pin 2OUT] - 8 [pin 3OUT] - VCC- [pin 11] ### U3 — [TL074CN](https://www.flux.ai/adrian95/tl074cn~k2h.md) - Manufacturer Part Number: TL074CN - Datasheet URL: https://www.ti.com/lit/ds/symlink/tl071.pdf - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit **Pins:** - 1IN- [pin 2] - 1IN+ [pin 3] - 1OUT [pin 1] - 2IN- [pin 6] - 2IN+ [pin 5] - 2OUT [pin 7] - 3IN- [pin 9] - 3IN+ [pin 10] - 3OUT [pin 8] - 4IN- [pin 13] - 4IN+ [pin 12] - 4OUT [pin 14] - VCC- [pin 11] - VCC+ [pin 4] ### U4 — [TL074CN](https://www.flux.ai/adrian95/tl074cn~k2h.md) - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/lit/ds/symlink/tl071.pdf - Manufacturer Part Number: TL074CN **Pins:** - 1IN- [pin 2] - 1IN+ [pin 3] - 1OUT [pin 1] - 2IN- [pin 6] - 2IN+ [pin 5] - 2OUT [pin 7] - 3IN- [pin 9] - 3IN+ [pin 10] - 3OUT [pin 8] - 4IN- [pin 13] - 4IN+ [pin 12] - 4OUT [pin 14] - VCC- [pin 11] - VCC+ [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/donpanino/eq-mix-clean-boost-pedal~ah](https://www.flux.ai/donpanino/eq-mix-clean-boost-pedal~ah).* --- *Generated from [https://www.flux.ai/donpanino/eq-mix-clean-boost-pedal~ah](https://www.flux.ai/donpanino/eq-mix-clean-boost-pedal~ah)*