# Nigadant Rt 1 ## Description Udayan Project 35K – JFET Guitar Compressor/Preamp Pedal with Relay True Bypass ## Project Details - **Owner:** bt23111028 - **Created:** 1/27/2026 - **Last Updated:** 1/27/2026 - **Visibility:** Public - **GroundStrategy:** Bottom copper plane dedicated to GND on Layer 2; implement dense via stitching between top and bottom GND wherever ground pads or polygons exist; use a single star ground reference at the 9 V power input return (GND net) where input jack and supply ground meet; keep relay coil return currents on a localized GND path near K1 and Q3, tying into the star point only once to minimize noise coupling into high‑Z and audio signal grounds. - **PlacementGuidelines:** Edge-mount pots (RV1, RV2), jacks (J1, J2, J3), and switch (SW1) along enclosure edges for accessibility; place JFET input buffer (J1/MMBFJ201) immediately adjacent to the input jack (J2) to minimize high-impedance trace length; place relay AGQ200A4HZ (K1) at the output section near output jack (J3) with driver transistor 2N3904 (Q3) adjacent to K1 for short coil and control connections; group feedback-path components (Q1, Q2, R2, RV1 and any associated RC elements) tightly around their respective amplifier transistors to keep feedback traces as short and direct as possible. - **RoutingGuidelines:** isolation of audio nets from power and relay nets; priority to short, direct audio signal paths; continuous DRC monitoring during layout - **DesignRuleSettings:** Trace width: 10 mil; Clearance: 8 mil; Routing corner angle: 45°; Via sizes: standard - **NetClassification:** HighZ_Audio: JFET_GATE; maintain 20 mil clearance from noisy nets. Audio_Signal: BLEND_IN, FB1, FB2, IN; maintain 15 mil separation from power nets. Power_9V: VCC_9V; route near ground star, avoid crossing audio paths. Relay_Coil: K1 coil pins; route on separate layer with 100 mil clearance from audio nets. LED: LED_NODE; ensure 10 mil clearance from adjacent power nets. ## Key Components ### D1 — [1N4001W](https://www.flux.ai/lcsc/1n4001w~4j88.md) - Manufacturer Name: YONGYUTAI(永裕泰) - Manufacturer Part Number: 1N4001W - Role Details: Flyback diode for relay coil - Package or Case Code: SOD-123_L2.6-W1.8-LS3.7-RD - Role: Flyback / Freewheeling - JLCPCB Part Class: Extended Part - LCSC Part Number: C2944152 - Part Type: Diodes - General Purpose **Pins:** - A [pin 2] - C [pin 1] ### D2 — [LED 0805 (2012 Metric)](https://www.flux.ai/vasyl/led-0805-2012-metric~sr7.md) - Role Details: Indicator LED for bypass status - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### J1 — [MMBFJ201](https://www.flux.ai/adrian95/mmbfj201~w6.md) - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mmbfj202-d.pdf - Max Supply Voltage: 40V - Role: Amplification - Manufacturer Part Number: MMBFJ201 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Role Details: Input buffer JFET - Manufacturer Name: onsemi **Pins:** - D [pin 1] - G [pin 3] - S [pin 2] ### J2 — [NCJ6FA-H](https://www.flux.ai/adrian95/ncj6fa-h~0o0.md) - Role Details: Stereo input/output jack - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: NCJ6FA-H - Manufacturer Name: Neutrik - Part Type: Connector - Datasheet URL: https://www.mouser.com/datasheet/2/289/ncj6fah-2-1854048.pdf - Role: Interface **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - G [pin 8] - R [pin 5] - S [pin 4] - T_1 [pin 6] - T_2 [pin 7] ### J3 — [NCJ6FA-H](https://www.flux.ai/adrian95/ncj6fa-h~0o0.md) - Part Type: Connector - Role Details: Stereo input/output jack - Datasheet URL: https://www.mouser.com/datasheet/2/289/ncj6fah-2-1854048.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Interface - Manufacturer Part Number: NCJ6FA-H - Manufacturer Name: Neutrik **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - G [pin 8] - R [pin 5] - S [pin 4] - T_1 [pin 6] - T_2 [pin 7] ### K1 — [AGQ200A4HZ](https://www.flux.ai/lcsc/agq200a4hz~p0vm.md) - Role: Switching - Role Details: DPDT true bypass relay - Product Info Url: https://lcsc.com/product-detail/New-Arrivals_PANASONIC-AGQ200A4H_C490150.html - JLCPCB Part Class: Extended Part - LCSC Part Number: C490150 - Part Type: Power Relays - Package or Case Code: RELAY-SMD_AGQ200A4HZ - Manufacturer Name: PANASONIC(松下) - Manufacturer Part Number: AGQ200A4HZ - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2003131412_PANASONIC-AGQ200A4HZ_C490150.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] ### Q1 — [BC108B PBFREE](https://www.flux.ai/jecstronic/bc108b-pbfree~wec.md) - Part Type: Transistor - Max Supply Voltage: 45V - Role Details: Amplifier transistor for gain stage - Manufacturer Name: Central Semiconductor Corp - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://my.centralsemi.com/datasheets/BC107.PDF - Manufacturer Part Number: BC108B PBFREE - Role: Amplification **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q2 — [BC108B PBFREE](https://www.flux.ai/jecstronic/bc108b-pbfree~wec.md) - Manufacturer Part Number: BC108B PBFREE - Datasheet URL: https://my.centralsemi.com/datasheets/BC107.PDF - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Central Semiconductor Corp - Max Supply Voltage: 45V - Role: Amplification - Role Details: Amplifier transistor for gain stage - Part Type: Transistor **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q3 — [2N3904](https://www.flux.ai/adrian95/2n3904~a6d.md) - Manufacturer Part Number: 2N3904 - Part Type: Transistor - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: NTE Electronics, Inc - Role Details: Relay driver transistor - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf - Role: Switching **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### RV1 — [PTN16-A100120K1A1](https://www.flux.ai/adrian95/ptn16-a100120k1a1~9zw.md) - Part Type: Potentiometer - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.cuidevices.com/product/resource/digikeypdf/ptn16.pdf - Role: Voltage Division - Manufacturer Name: Same Sky (Formerly CUI Devices) - Role Details: Volume control potentiometer - Package or Case Code: POT_PTN16-A100120K1A1 - Manufacturer Part Number: PTN16-A100120K1A1 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### RV2 — [P160KN2-0QC20B100K](https://www.flux.ai/adrian95/p160kn2-0qc20b100k~zzh.md) - Datasheet URL: https://www.ttelectronics.com/TTElectronics/media/ProductFiles/Datasheet/P160.pdf - Part Type: Resistor - Manufacturer Part Number: P160KN2-0QC20B100K - Role: Voltage Division - Role Details: Clean/wet blend potentiometer - Manufacturer Name: TT Electronics/BI - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - CCW [pin 2] - CW [pin 1] - WIPER [pin 3] ### SW1 — [SPDT Toggle Switch on-none-on](https://www.flux.ai/jwwitherspoon/spdt-toggle-switch-on-none-on~rz.md) - Role: Debouncing - Current: 3A - Manufacturer Part Number: 200MSP1T1B1M2QEH - Manufacturer Name: E-Switch - Purchase Url: https://www.digikey.com/en/products/detail/e-switch/200MSP1T1B1M2QEH/378916 - Role Details: SPDT footswitch for bypass control - Part Type: Switch - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/6463/Series%20200%20Switches.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/bt23111028/nigadant-rt-1~jl](https://www.flux.ai/bt23111028/nigadant-rt-1~jl).* --- *Generated from [https://www.flux.ai/bt23111028/nigadant-rt-1~jl](https://www.flux.ai/bt23111028/nigadant-rt-1~jl)*