# Urgent Emerald Ecto Goggles b2e5 ## Description 100 W Bridged Class-AB Audio Power Amplifier with LTP Input, VAS Miller Compensation, Complementary MJE340/350 Drivers, 2SC5198/2SA1941 Outputs, Zobel Network, and LC Output Filter on ±14 V Rails ## Project Details - **Owner:** chris42133 - **Created:** 2/9/2026 - **Last Updated:** 2/9/2026 - **Visibility:** Public - **Closed-Loop Gain Target:** 28dB - **Feedback Gain:** 28dB - **System Architecture:** flowchart TD subgraph LegA [Amplifier Leg A] IN_A[Audio Input A] --> RF_A[RF Filter] RF_A --> LTP_A[LTP Q1/Q2] LTP_A --> SUM_A[Summing Node A] --> FB_A[10kΩ Feedback Divider] SUM_A --> TAIL_A[100Ω Tail Source] SUM_A --> MILLER_A[100pF Miller Cap] --> VAS_A(2SD600) VAS_A --> DSUM_A[Driver Summing Node A] DSUM_A --> NPN_A(MJE340) --> ZR_A[4.7Ω] DSUM_A --> PNP_A(MJE350) --> ZC_A[100nF] ZR_A --> LFA1[10uH] ZC_A --> LFA2[10uH] LFA1 --> OUT_A LFA2 --> OUT_A end subgraph LegB [Amplifier Leg B] IN_B[Audio Input B] --> RF_B[RF Filter] RF_B --> LTP_B[LTP Q1/Q2] LTP_B --> SUM_B[Summing Node B] --> FB_B[10kΩ Feedback Divider] SUM_B --> TAIL_B[100Ω Tail Source] SUM_B --> MILLER_B[100pF Miller Cap] --> VAS_B(2SD600) VAS_B --> DSUM_B[Driver Summing Node B] DSUM_B --> NPN_B(MJE340) --> ZR_B[4.7Ω] DSUM_B --> PNP_B(MJE350) --> ZC_B[100nF] ZR_B --> LFB1[10uH] ZC_B --> LFB2[10uH] LFB1 --> OUT_B LFB2 --> OUT_B end subgraph Power [Power Rails] VPLUS[+14V] --> BulkP[100uF] --> DecP[100nF] VMINUS[-14V] --> BulkN[100uF] --> DecN[100nF] GND -.-> LegA GND -.-> LegB end OUT_A --> SPEAKER[Speaker] SPEAKER --> OUT_B - **Configuration Mode:** BTL ## Key Components ### D1 — [1N4148W-E3-18](https://www.flux.ai/lcsc/1n4148w-e3-18.md) - Package or Case Code: SOD-123_L2.7-W1.6-LS3.7-FD - Role Details: DC offset detect clamp diode for speaker protection circuit - Manufacturer Part Number: 1N4148W-E3-18 - Manufacturer Name: VISHAY(威世) - Part Type: Switching Diode - Product Info Url: https://lcsc.com/product-detail/Others_Vishay-Intertech_1N4148W-E3-18_Vishay-Intertech-1N4148W-E3-18_C191428.html - LCSC Part Number: C191428 - Datasheet URL: https://lcsc.com/product-detail/Others_Vishay-Intertech_1N4148W-E3-18_Vishay-Intertech-1N4148W-E3-18_C191428.html - JLCPCB Part Class: Extended Part - Role: Clamping - Package: SOD-123_L2.7-W1.6-LS3.7-FD **Pins:** - A [pin 1] - K [pin 2] ### F1 — [0ZCF0200AF2C](https://www.flux.ai/adrian95/0zcf0200af2c.md) - Part Type: Fuse - Manufacturer Name: BelFuse - Datasheet URL: https://belfuse.com/resources/datasheets/circuitprotection/ds-cp-0zcf-series.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 0ZCF0200AF2C - Package: 2920 (7351 Metric) - Role Details: +14V rail: Resettable PTC fuse (hold current ~2 A, voltage rating 24 V) - Role: Protection - Package or Case Code: FUSC7451X80N **Pins:** - ~ [pin 2] - ~ [pin 1] ### F2 — [0ZCF0200AF2C](https://www.flux.ai/adrian95/0zcf0200af2c.md) - Package or Case Code: FUSC7451X80N - Role: Protection - Manufacturer Part Number: 0ZCF0200AF2C - Role Details: -14V rail: Resettable PTC fuse (hold current ~2 A, voltage rating 24 V) - Package: 2920 (7351 Metric) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://belfuse.com/resources/datasheets/circuitprotection/ds-cp-0zcf-series.pdf - Manufacturer Name: BelFuse - Part Type: Fuse **Pins:** - ~ [pin 2] - ~ [pin 1] ### FB — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor.md) - Package: SMD_0805_2012Metric - Part Type: Resistor - Resistance: 24.9kΩ - Role Details: Feedback resistor from OUT to FB - Role: Voltage Division **Pins:** - P1 [pin 1] - P2 [pin 2] ### FB — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor.md) - Part Type: Resistor - Package: SMD_0805_2012Metric - Role: Voltage Division - Resistance: 1.00kΩ - Role Details: Feedback divider ground resistor **Pins:** - P1 [pin 1] - P2 [pin 2] ### FB — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor.md) - Role: Voltage Division - Role Details: Feedback divider ground resistor - Resistance: 1.00kΩ - Package: SMD_0805_2012Metric - Part Type: Resistor **Pins:** - P1 [pin 1] - P2 [pin 2] ### FB_A — [Generic Resistor](https://www.flux.ai/jharwinbarrozo/generic-resistor.md) - Part Type: Resistor - Role Details: Feedback resistor from OUT to FB - Package: SMD_0805_2012Metric - Resistance: 24.9kΩ - Role: Voltage Division **Pins:** - P1 [pin 1] - P2 [pin 2] ### J1 — [DC-003A-3.5A-1.3](https://www.flux.ai/lcsc/dc-003a-3p5a-1p3.md) - Role: Connector - Part Type: AC/DC Power Connectors - Manufacturer Part Number: DC-003A-3.5A-1.3 - Role Details: Power input for ±14 V rails (tip = +14 V, switch = GND, sleeve = –14 V) - Package or Case Code: DC-IN-TH_DC-003A-3.5A-1.3 - JLCPCB Part Class: Extended Part - LCSC Part Number: C779945 - Manufacturer Name: XKB Connection(中国星坤) **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### J2 — [PJ-301BM](https://www.flux.ai/dominic-dev/pj-301bm.md) - Datasheet URL: http://www.taydaelectronics.com/datasheets/files/A-2566.pdf - Part Type: Connector - Purchase Url: https://www.aliexpress.com/item/1005001958349207.html - Connector Type: Audio / Video Connectors - Role: Connector - Role Details: Audio input connector (3.5mm mono jack) **Pins:** - S1 - S2 - T - TN ### J3 — [282837-2](https://www.flux.ai/vasy_skral/282837-2.md) - Manufacturer Name: TE Connectivity AMP Connectors - Role Details: Speaker output terminal block (2-pin) for bridged outputs - Role: Connector - Part Type: Connector - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Manufacturer Part Number: 282837-2 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J4 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/pin-header-01x02-254mm-vertical.md) - Role Details: Speaker protection detection header pin - Part Type: Connector - Role: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### Q1 — [2N3904](https://www.flux.ai/adrian95/2n3904.md) - Package: TO-92 - Role Details: LTP input transistor - Manufacturer Name: NTE Electronics, Inc - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf - Role: Amplification - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Manufacturer Part Number: 2N3904 **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q1 — [2N3904](https://www.flux.ai/adrian95/2n3904.md) - Role: Amplification - Role Details: LTP input transistor - Package: TO-92 - Part Type: Transistor - Manufacturer Part Number: 2N3904 - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf - Manufacturer Name: NTE Electronics, Inc - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q10 — [2N3904](https://www.flux.ai/adrian95/2n3904.md) - Role Details: LTP input transistor (second leg) - Manufacturer Name: NTE Electronics, Inc - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Manufacturer Part Number: 2N3904 - Role: Amplification **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q11 — [2SD600KF](https://www.flux.ai/jecstronic/2sd600kf.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: onsemi - Role Details: VAS stage transistor (second leg) - Datasheet URL: https://rocelec.widen.net/view/pdf/a2wtaz4aw6/ONSMS37394-1.pdf?t.download=true&u=5oefqw - Role: Amplification - Manufacturer Part Number: 2SD600KF - Part Type: Transistor **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q12 — [MJE340STU](https://www.flux.ai/lcsc/mje340stu.md) - JLCPCB Part Class: Extended Part - Part Type: Bipolar Transistors - BJT - Manufacturer Part Number: MJE340STU - Product Info Url: https://lcsc.com/product-detail/Transistors_ON_MJE340STU_MJE340STU_C179748.html - Role: Amplification - Manufacturer Name: onsemi(安森美) - LCSC Part Number: C179748 - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - Role Details: Driver stage transistor (second leg) - Package or Case Code: TO-126_L8.3-W3.5-P2.29-T **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q13 — [MJE350STU](https://www.flux.ai/lcsc/mje350stu.md) - Package or Case Code: TO-126_L8.3-W3.5-P2.29-T - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010333_onsemi-MJE350STU_C179749.pdf - Role Details: Driver stage transistor (second leg) - Manufacturer Part Number: MJE350STU - Part Type: Bipolar Transistors - BJT - Role: Amplification - JLCPCB Part Class: Extended Part - Manufacturer Name: onsemi(安森美) - Product Info Url: https://lcsc.com/product-detail/Transistors_ON_MJE350STU_MJE350STU_C179749.html - LCSC Part Number: C179749 **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q14 — [2SC5198](https://www.flux.ai/lcsc/2sc5198.md) - Role: Amplification - Part Type: Bipolar Transistors - BJT - Package or Case Code: TO-3P-3_L15.8-W4.8-P5.45-L - Role Details: Output transistor NPN (second leg) - LCSC Part Number: C557876 - JLCPCB Part Class: Extended Part - Manufacturer Name: YW(友旺) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2007071533_YW-2SC5198_C557876.pdf - Product Info Url: https://lcsc.com/product-detail/Transistors-NPN-PNP_YW-2SC5198_C557876.html - Manufacturer Part Number: 2SC5198 **Pins:** - B [pin 1] - C [pin 2] - E [pin 3] ### Q15 — [2SA1941](https://www.flux.ai/lcsc/2sa1941.md) - Role: Amplification - LCSC Part Number: C557881 - Manufacturer Name: YW(友旺) - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/Transistors-NPN-PNP_YW-2SA1941_C557881.html - Package or Case Code: TO-3P-3_L15.8-W4.8-P5.45-L - Role Details: Output transistor PNP (second leg) - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2007071533_YW-2SA1941_C557881.pdf - Part Type: Bipolar Transistors - BJT - Manufacturer Part Number: 2SA1941 **Pins:** - B [pin 1] - C [pin 2] - E [pin 3] ### Q2 — [2N3904](https://www.flux.ai/adrian95/2n3904.md) - Role Details: LTP input transistor - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf - Manufacturer Name: NTE Electronics, Inc - Manufacturer Part Number: 2N3904 - Role: Amplification - Package: TO-92 - Part Type: Transistor **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q2 — [2N3904](https://www.flux.ai/adrian95/2n3904.md) - Part Type: Transistor - Role Details: LTP input transistor - Package: TO-92 - Manufacturer Part Number: 2N3904 - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf - Manufacturer Name: NTE Electronics, Inc - Role: Amplification - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q3 — [2SD600KF](https://www.flux.ai/jecstronic/2sd600kf.md) - Role Details: VAS stage transistor - Manufacturer Part Number: 2SD600KF - Part Type: Transistor - Datasheet URL: https://rocelec.widen.net/view/pdf/a2wtaz4aw6/ONSMS37394-1.pdf?t.download=true&u=5oefqw - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: onsemi - Role: Amplification **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q3 — [2SD600KF](https://www.flux.ai/jecstronic/2sd600kf.md) - Manufacturer Name: onsemi - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: VAS stage transistor - Role: Amplification - Manufacturer Part Number: 2SD600KF - Part Type: Transistor - Datasheet URL: https://rocelec.widen.net/view/pdf/a2wtaz4aw6/ONSMS37394-1.pdf?t.download=true&u=5oefqw **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q4 — [MJE340STU](https://www.flux.ai/lcsc/mje340stu.md) - JLCPCB Part Class: Extended Part - Part Type: Bipolar Transistors - BJT - Manufacturer Part Number: MJE340STU - Role: Amplification - Product Info Url: https://lcsc.com/product-detail/Transistors_ON_MJE340STU_MJE340STU_C179748.html - Manufacturer Name: onsemi(安森美) - Role Details: Driver transistor for output stage - Package or Case Code: TO-126_L8.3-W3.5-P2.29-T - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - LCSC Part Number: C179748 **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q4 — [MJE340STU](https://www.flux.ai/lcsc/mje340stu.md) - JLCPCB Part Class: Extended Part - Manufacturer Part Number: MJE340STU - Part Type: Bipolar Transistors - BJT - Product Info Url: https://lcsc.com/product-detail/Transistors_ON_MJE340STU_MJE340STU_C179748.html - Manufacturer Name: onsemi(安森美) - Package or Case Code: TO-126_L8.3-W3.5-P2.29-T - Role: Amplification - Role Details: Driver transistor for output stage - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - LCSC Part Number: C179748 **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q5 — [MJE350STU](https://www.flux.ai/lcsc/mje350stu.md) - Manufacturer Name: onsemi(安森美) - JLCPCB Part Class: Extended Part - Role Details: Driver transistor for output stage - Part Type: Bipolar Transistors - BJT - Role: Amplification - Product Info Url: https://lcsc.com/product-detail/Transistors_ON_MJE350STU_MJE350STU_C179749.html - LCSC Part Number: C179749 - Package or Case Code: TO-126_L8.3-W3.5-P2.29-T - Package: TO-220 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010333_onsemi-MJE350STU_C179749.pdf - Manufacturer Part Number: MJE350STU **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q5 — [MJE350STU](https://www.flux.ai/lcsc/mje350stu.md) - Part Type: Bipolar Transistors - BJT - JLCPCB Part Class: Extended Part - Manufacturer Name: onsemi(安森美) - Role Details: Driver transistor for output stage - Product Info Url: https://lcsc.com/product-detail/Transistors_ON_MJE350STU_MJE350STU_C179749.html - LCSC Part Number: C179749 - Package or Case Code: TO-126_L8.3-W3.5-P2.29-T - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2410010333_onsemi-MJE350STU_C179749.pdf - Manufacturer Part Number: MJE350STU - Role: Amplification **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q6 — [2SC5198](https://www.flux.ai/lcsc/2sc5198.md) - LCSC Part Number: C557876 - Package or Case Code: TO-3P-3_L15.8-W4.8-P5.45-L - Part Type: Bipolar Transistors - BJT - Product Info Url: https://lcsc.com/product-detail/Transistors-NPN-PNP_YW-2SC5198_C557876.html - Manufacturer Part Number: 2SC5198 - Role Details: Output transistor NPN for bridge leg - Manufacturer Name: YW(友旺) - Role: Amplification - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2007071533_YW-2SC5198_C557876.pdf - Package: TO-220 - JLCPCB Part Class: Extended Part **Pins:** - B [pin 1] - C [pin 2] - E [pin 3] ### Q6 — [2SC5198](https://www.flux.ai/lcsc/2sc5198.md) - Role: Amplification - Manufacturer Part Number: 2SC5198 - Product Info Url: https://lcsc.com/product-detail/Transistors-NPN-PNP_YW-2SC5198_C557876.html - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2007071533_YW-2SC5198_C557876.pdf - Manufacturer Name: YW(友旺) - Role Details: Output transistor NPN for bridge leg - JLCPCB Part Class: Extended Part - LCSC Part Number: C557876 - Package or Case Code: TO-3P-3_L15.8-W4.8-P5.45-L - Part Type: Bipolar Transistors - BJT **Pins:** - B [pin 1] - C [pin 2] - E [pin 3] ### Q7 — [2SA1941](https://www.flux.ai/lcsc/2sa1941.md) - Package or Case Code: TO-3P-3_L15.8-W4.8-P5.45-L - Role Details: Output transistor PNP for bridge leg - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2007071533_YW-2SA1941_C557881.pdf - Role: Amplification - Manufacturer Part Number: 2SA1941 - Part Type: Bipolar Transistors - BJT - LCSC Part Number: C557881 - Manufacturer Name: YW(友旺) - Product Info Url: https://lcsc.com/product-detail/Transistors-NPN-PNP_YW-2SA1941_C557881.html - JLCPCB Part Class: Extended Part **Pins:** - B [pin 1] - C [pin 2] - E [pin 3] ### Q8 — [MJE340STU](https://www.flux.ai/lcsc/mje340stu.md) - Manufacturer Name: onsemi(安森美) - Package or Case Code: TO-126_L8.3-W3.5-P2.29-T - LCSC Part Number: C179748 - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - JLCPCB Part Class: Extended Part - Role: Biasing - Product Info Url: https://lcsc.com/product-detail/Transistors_ON_MJE340STU_MJE340STU_C179748.html - Role Details: Vbe multiplier transistor for driver bias network - Manufacturer Part Number: MJE340STU - Part Type: Bipolar Transistors - BJT - Package: TO-126_L8.3-W3.5-P2.29-T **Pins:** - B [pin 3] - C [pin 2] - E [pin 1] ### Q9 — [2N3904](https://www.flux.ai/adrian95/2n3904.md) - Part Type: Transistor - Manufacturer Part Number: 2N3904 - Role Details: LTP input transistor (second leg) - Manufacturer Name: NTE Electronics, Inc - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf - Role: Amplification - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/chris42133/urgent-emerald-ecto-goggles-b2e5](https://www.flux.ai/chris42133/urgent-emerald-ecto-goggles-b2e5).* --- *Generated from [https://www.flux.ai/chris42133/urgent-emerald-ecto-goggles-b2e5](https://www.flux.ai/chris42133/urgent-emerald-ecto-goggles-b2e5)*