# NE555 Signal Injector Timer ## Description Welcome to your new project. Imagine what you can build here. ## Project Details - **Owner:** circits38 - **Created:** 4/9/2026 - **Last Updated:** 4/29/2026 - **Visibility:** Public ## Key Components ### D1 — [1N5819G](https://www.flux.ai/lcsc/1n5819g~ehiz.md) - Package or Case Code: DO-41_BD2.4-L4.7-P8.70-D0.9-RD - Role: Flyback clamp - Role Details: Schottky flyback clamp across T1 primary with cathode to +12V and anode to Q1 drain primary low side to reduce reverse-recovery losses and protect the MOSFET at about 33.2 kHz. - Part Type: Schottky Barrier Diodes (SBD) - Product Info Url: https://lcsc.com/product-detail/Schottky-Barrier-Diodes-SBD_ON-Semicon_1N5819G_ON-Semicon-ON-1N5819G_C232463.html - Package: Through Hole - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302136_onsemi-1N5819G_C232463.pdf - JLCPCB Part Class: Extended Part - Manufacturer Part Number: 1N5819G - Manufacturer Name: onsemi(安森美) - LCSC Part Number: C232463 **Pins:** - A [pin 2] - K [pin 1] ### J1 — [Pin Header 01x01 2.54mm Vertical - Circular Pad](https://www.flux.ai/markwuflux/pin-header-01x01-2p54mm-vertical-circular-pad~vp.md) - Package: Through Hole - Role Details: Red Clip (Cable) terminal connected directly to the top transformer secondary leg - Role: Output terminal - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] ### J2 — [Pin Header 01x01 2.54mm Vertical - Circular Pad](https://www.flux.ai/markwuflux/pin-header-01x01-2p54mm-vertical-circular-pad~vp.md) - Part Type: Connector - Package: Through Hole - License: https://creativecommons.org/licenses/by/4.0/ - Role: Output terminal - Role Details: Black Clip (Ground Stake) terminal connected to the bottom transformer secondary leg through a 100nF series capacitor **Pins:** - P1 [pin 1] ### Q1 — [IRLZ44NPBF](https://www.flux.ai/jecstronic/irlz44npbf~kg9.md) - Manufacturer Name: Infineon Technologies - Manufacturer Part Number: IRLZ44NPBF - Package: TO-220AB - Role: Low-side load switch - Role Details: IRLZ44N N-channel MOSFET driven directly by the NE555 output; source to ground, drain reserved for future 12V load switching - Datasheet URL: https://www.mouser.com/datasheet/2/196/Infineon_IRLZ44N_DataSheet_v01_01_EN-3363447.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor **Pins:** - D [pin 2] - G [pin 1] - S [pin 3] ### T1 — [HX1188NLT](https://www.flux.ai/adrian95/hx1188nlt~he4.md) - Manufacturer Part Number: HX1188NLT - Datasheet URL: https://www.verical.com/datasheet/pulse-electronics-telecom-HX1188NLT-227027.pdf - Part Type: Transformer - Role Details: 1:1 isolation transformer with primary driven from +12V through the MOSFET drain at about 33 kHz; secondary wired to external test leads with intentional imbalance: top leg direct to Red Clip and bottom leg through 100nF series capacitor to Black Clip for common-mode leakage current injection - License: https://creativecommons.org/licenses/by/4.0/ - Role: RF isolation transformer - Manufacturer Name: Pulse Electronics - Package: SMD **Pins:** - CMT_1 [pin 10] - CMT_2 [pin 15] - NC_1 [pin 4] - NC_2 [pin 5] - NC_3 [pin 12] - NC_4 [pin 13] - RCT [pin 7] - RD- [pin 8] - RD+ [pin 6] - RX- [pin 9] - RX+ [pin 11] - TCT [pin 2] - TD- [pin 3] - TD+ [pin 1] - TX- [pin 14] - TX+ [pin 16] ### U1 — [NE555P - 518340](https://www.flux.ai/kicad-part-library/ne555p~vhf.md) - Package: PDIP-8 - Manufacturer Name: Texas Instruments Inc. - Role: Astable timer - Manufacturer Part Number: NE555P - Role Details: Provides the 555 timer core with VCC, GND, RESET, CTRL, THRESH, TRIG, DISCH, and OUT pins for the signal injector oscillator - Datasheet URL: http://www.ti.com/lit/ds/symlink/ne555.pdf - Package or Case Code: DIP-8_W7.62mm **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] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/circits38/ne555-signal-injector-timer~29](https://www.flux.ai/circits38/ne555-signal-injector-timer~29).* --- *Generated from [https://www.flux.ai/circits38/ne555-signal-injector-timer~29](https://www.flux.ai/circits38/ne555-signal-injector-timer~29)*