# Pedalboard Headphone Amp ## Description Stereo headphone amp meant to fit in a pedal enclosure for use on a pedalboard. Buffers the signal, then splits it to an output meant to go to a mixer and a headphone out. The headphone amp circuit is applied to the signal before the headphone jack. Originally designed to give the ability to run effects after an amp simulator pedal with no effects loop. Example chain: amp sim > wet effects > headphone amp > mixer. References: https://electrosmash.com/images/tech/klon-centaur/klon-centaur-power-supply.png https://aionfx.com/app/files/docs/refractor_documentation.pdf https://www.muzique.com/lab/buffers.htm ## Project Details - **Owner:** jwwitherspoon - **Created:** 10/22/2024 - **Last Updated:** 4/12/2025 - **Visibility:** Public ## Key Components ### D1 — [1N4742A](https://www.flux.ai/jecstronic/1n4742a~b6r.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: onsemi - Part Type: Diode - Manufacturer Part Number: 1N4742A - Datasheet URL: https://rocelec.widen.net/view/pdf/7qfz7dzkx8/ONSM-S-A0003585147-1.pdf **Pins:** - A [pin 2] - K [pin 1] ### D2 — [1N4001-T](https://www.flux.ai/jecstronic/1n4001-t~t6.md) - Part Type: Diode - Manufacturer Part Number: 1N4001-T - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Diodes Incorporated - Datasheet URL: https://www.mouser.com/datasheet/2/308/1N4001_D-1801424.pdf **Pins:** - A [pin 2] - K [pin 1] ### D3 — [1N4001-T](https://www.flux.ai/jecstronic/1n4001-t~t6.md) - Part Type: Diode - Manufacturer Part Number: 1N4001-T - Datasheet URL: https://www.mouser.com/datasheet/2/308/1N4001_D-1801424.pdf - Manufacturer Name: Diodes Incorporated - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### D4 — [1N4148-1](https://www.flux.ai/jecstronic/1n4148-1~jje.md) - Manufacturer Part Number: 1N4148-1 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip - Part Type: Diode - Datasheet URL: https://www.mouser.com/datasheet/2/308/1N914_D-1801484.pdf **Pins:** - A [pin 2] - K [pin 1] ### D5 — [1N4148-1](https://www.flux.ai/jecstronic/1n4148-1~jje.md) - Manufacturer Part Number: 1N4148-1 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip - Part Type: Diode - Datasheet URL: https://www.mouser.com/datasheet/2/308/1N914_D-1801484.pdf **Pins:** - A [pin 2] - K [pin 1] ### D6 — [1N4148-1](https://www.flux.ai/jecstronic/1n4148-1~jje.md) - Part Type: Diode - Datasheet URL: https://www.mouser.com/datasheet/2/308/1N914_D-1801484.pdf - Manufacturer Name: Microchip - Manufacturer Part Number: 1N4148-1 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### D7 — [1N4148-1](https://www.flux.ai/jecstronic/1n4148-1~jje.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1N4148-1 - Datasheet URL: https://www.mouser.com/datasheet/2/308/1N914_D-1801484.pdf - Part Type: Diode - Manufacturer Name: Microchip **Pins:** - A [pin 2] - K [pin 1] ### J1 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### J2 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### J3 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### J4 — [Pin Socket 01x03 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x03-254mm-vertical~tj7.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J5 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### Q1 — [MPSA92](https://www.flux.ai/kicad-part-library/mpsa92~ke.md) - Package or Case Code: TO-92_Inline - Datasheet URL: http://www.onsemi.com/pub_link/Collateral/MPSA92-D.PDF - Manufacturer Part Number: MPSA92 **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q2 — [MPSA42](https://www.flux.ai/kicad-part-library/mpsa42~m8.md) - Datasheet URL: http://www.onsemi.com/pub_link/Collateral/MPSA42-D.PDF - Manufacturer Part Number: MPSA42 - Package or Case Code: TO-92_Inline **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q3 — [MPSA42](https://www.flux.ai/kicad-part-library/mpsa42~m8.md) - Package or Case Code: TO-92_Inline - Datasheet URL: http://www.onsemi.com/pub_link/Collateral/MPSA42-D.PDF - Manufacturer Part Number: MPSA42 **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q4 — [MPSA92](https://www.flux.ai/kicad-part-library/mpsa92~ke.md) - Datasheet URL: http://www.onsemi.com/pub_link/Collateral/MPSA92-D.PDF - Manufacturer Part Number: MPSA92 - Package or Case Code: TO-92_Inline **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### U1 — [TC1044SEPA](https://www.flux.ai/jwwitherspoon/tc1044sepa~pg.md) - Manufacturer Part Number: TC1044SEPA - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/21348a.pdf - Manufacturer Name: Microchip Technology **Pins:** - BOOST [pin 1] - CAP- [pin 4] - CAP+ [pin 2] - GND [pin 3] - LOW_VOLTAGE_(LV) [pin 6] - OSC [pin 7] - V+ [pin 8] - VOUT [pin 5] ### U2 — [TL072IP](https://www.flux.ai/jecstronic/tl072ip~sf.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: TL072IP - Datasheet URL: https://www.ti.com/lit/ds/symlink/tl072a.pdf - Manufacturer Name: Texas Instruments - Part Type: Integrated Circuit **Pins:** - -VCC [pin 4] - 1IN- [pin 6] - 1IN- [pin 2] - 1IN+ [pin 3] - 1OUT [pin 1] - 2IN+ [pin 5] - 2OUT [pin 7] - VCC+ [pin 8] ### U3 — [TL072IP](https://www.flux.ai/jecstronic/tl072ip~sf.md) - Manufacturer Part Number: TL072IP - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ti.com/lit/ds/symlink/tl072a.pdf - Manufacturer Name: Texas Instruments - Part Type: Integrated Circuit **Pins:** - -VCC [pin 4] - 1IN- [pin 6] - 1IN- [pin 2] - 1IN+ [pin 3] - 1OUT [pin 1] - 2IN+ [pin 5] - 2OUT [pin 7] - VCC+ [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/jwwitherspoon/pedalboard-headphone-amp~a2](https://www.flux.ai/jwwitherspoon/pedalboard-headphone-amp~a2).* --- *Generated from [https://www.flux.ai/jwwitherspoon/pedalboard-headphone-amp~a2](https://www.flux.ai/jwwitherspoon/pedalboard-headphone-amp~a2)*