PWM Modulator
About the PWM Modulator PCB
PWM Modulator is an open source PCB design by justharihere, published on GitHub. It is a 2-layer board measuring 34.7 × 12.2 mm, with 18 components from 9 distinct parts.
Other key parts include the NE555DR. By type, the board carries 9 capacitors, 4 resistors and 2 ICs.
From the project
This is an experimental PWM Modulator I developed while experimenting with NE555 timer ICs, datasheets, and learning PCB fab.
A fixed-frequency, variable-duty PWM modulator built from discrete 555 timer ICs — a 1 kHz astable NE555 triggering a monostable NE555, with a potentiometer controlling pulse width. Designed in KiCad and fabricated through JLCPCB.
[SCREENSHOT: full schematic, exported from KiCad]
- Astable NE555 (U1) generates a fixed 1 kHz clock - Clock triggers a monostable NE555 (U2), whose pulse width is set by a potentiometer-controlled RC network - [Brief note on any supporting components — decoupling caps, output buffering, etc.]
Main components on the PWM Modulator
PWM Modulator bill of materials (BOM)
18 components, 9 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | NE555DR | SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL | U1, U2 |
| 2 | PH2.54-1X2P-H25 | HDR-TH_2P-P2.54-V-M-4 | H1, H2 |
| 1 | 3362P-1-103LF | RES-ADJ-TH_3362P | VR1 |
| 5 | CC0603KRX7R9BB104 | C0603 | C1, C4, C5, C8, C9 |
| 2 | CC0603KRX7R9BB103 | C0603 | C2, C7 |
| 2 | CL10A106KP8NNNC | C0603 | C3, C6 |
| 1 | RC0603FR-0715KL | R0603 | R1 |
| 2 | 0603WAF1002T5E | R0603 | R2, R5 |
| 1 | 0603WAF1003T5E | R0603 | R4 |
PWM Modulator design files
The KiCad project lives in the justharihere/PWM_Modulator repository on GitHub; these links point at the commit this page was built from.
- LayoutPWM modulator.kicad_pcb
- SchematicPWM modulator.kicad_sch
PWM Modulator: common questions
How big is the PWM Modulator PCB?
The PWM Modulator measures 34.7 × 12.2 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the PWM Modulator?
18 components, from 9 distinct parts. The full bill of materials is listed on this page.
Where can I download the PWM Modulator design files?
From the justharihere/PWM_Modulator repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the PWM Modulator design in my own project?
The repository has no license, so all rights stay with justharihere. Use it as a reference, and ask the author before reusing the design.