# Semantic Cyan Hoverboard ## Description 9V NE555 Latching Trigger to 40 ms Active-Low CD4066B Control Pulse ## Project Details - **Owner:** ethangarr - **Created:** 3/16/2026 - **Last Updated:** 3/16/2026 - **Visibility:** Public - **System Architecture:** flowchart TD A[Pulse Input] --> B[Trigger Conditioning] B --> C[NE555 Monostable] C --> D[Conditioned Edge Output] E[5V Supply] --> C E --> F[Decoupling Network] F --> C - **Operating Voltage:** 9V - **Output Pulse Width:** 10ms - **Trigger Type:** Falling-edge on TRIG after AC-coupled positive input pulse ## Key Components ### Q1 — [MMBT3904LT1G](https://www.flux.ai/openpartlist/mmbt3904lt1g.md) - Role: Inverter - Manufacturer Part Number: MMBT3904LT1G - Role Details: NPN transistor inverts the 555 high pulse into an active-low control pulse - Part Type: Transistor - Manufacturer Name: onsemi - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mmbt3904lt1-d.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Package: SOT-23 **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### U1 — [NE555D](https://www.flux.ai/kicad-part-library/ne555d.md) - Manufacturer Name: Texas Instruments Inc. - Role: Timer - Manufacturer Part Number: NE555D - Role Details: 9 V monostable timer generating a 40 ms internal high pulse from a latching input edge before inversion for analog switch control - Package or Case Code: SOIC-8_3.9x4.9mm_P1.27mm - Datasheet URL: http://www.ti.com/lit/ds/symlink/ne555.pdf - Package: SOIC-8 **Pins:** - CV [pin 5] - DIS [pin 7] - GND [pin 1] - Q [pin 3] - R [pin 4] - THR [pin 6] - TR [pin 2] - VCC [pin 8] ### U2 — [CD4066BPWR](https://www.flux.ai/vasy_skral/cd4066bpwr.md) - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ - Role: Analog Switch - Datasheet URL: https://www.ti.com/lit/ds/symlink/cd4066b.pdf - Part Type: Integrated Circuit - Manufacturer Part Number: CD4066BPWR - Package: TSSOP-14 - Role Details: Quad bilateral analog switch with one control input intended for the 40 ms active-low pulse **Pins:** - CONTROL_A [pin 13] - CONTROL_B [pin 5] - CONTROL_C [pin 6] - CONTROL_D [pin 12] - SIG_A_IN/OUT [pin 1] - SIG_A_OUT/IN [pin 2] - SIG_B_IN/OUT [pin 4] - SIG_B_OUT/IN [pin 3] - SIG_C_IN/OUT [pin 8] - SIG_C_OUT/IN [pin 9] - SIG_D_IN/OUT [pin 11] - SIG_D_OUT/IN [pin 10] - VDD [pin 14] - VSS [pin 7] ### U3 — [CD4066BPWR](https://www.flux.ai/vasy_skral/cd4066bpwr.md) - Role Details: Quad bilateral analog switch with one control input intended for the 40 ms active-low pulse - Package: TSSOP-14 - Part Type: Integrated Circuit - Manufacturer Part Number: CD4066BPWR - Role: Analog Switch - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ti.com/lit/ds/symlink/cd4066b.pdf - Manufacturer Name: Texas Instruments **Pins:** - CONTROL_A [pin 13] - CONTROL_B [pin 5] - CONTROL_C [pin 6] - CONTROL_D [pin 12] - SIG_A_IN/OUT [pin 1] - SIG_A_OUT/IN [pin 2] - SIG_B_IN/OUT [pin 4] - SIG_B_OUT/IN [pin 3] - SIG_C_IN/OUT [pin 8] - SIG_C_OUT/IN [pin 9] - SIG_D_IN/OUT [pin 11] - SIG_D_OUT/IN [pin 10] - VDD [pin 14] - VSS [pin 7] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/ethangarr/semantic-cyan-hoverboard](https://www.flux.ai/ethangarr/semantic-cyan-hoverboard).* --- *Generated from [https://www.flux.ai/ethangarr/semantic-cyan-hoverboard](https://www.flux.ai/ethangarr/semantic-cyan-hoverboard)*