EGB-240-Alternating-Relaxation-Oscillator
About the EGB-240-Alternating-Relaxation-Oscillator PCB
EGB-240-Alternating-Relaxation-Oscillator is an open source PCB design by Nigel-Grommen, published on GitHub. It is a 2-layer board measuring 57.5 × 41 mm, with 16 components from 14 distinct parts.
Other key parts include the CD40106B. By type, the board carries 4 diodes, 4 capacitors, 4 resistors, 1 IC, 1 crystal and 1 connector.
It belongs with the audio designs in this gallery.
From the project
Two-tone audio alert circuit built with CD40106B Hex Schmitt Trigger ICs; PCB designed in KiCad from schematic to fabrication.
EGB240 Electronic Design — Assessment 1: PCB Alarm Circuit Design
This project implements a battery-powered, two-tone siren circuit as a single-sided through-hole PCB. The design uses all six inverters of a single CD40106B Hex Schmitt Trigger IC to generate two alternating audio tones, drive alternating status LEDs, and switch between tones automatically — with no microcontroller required.
Main components on the EGB-240-Alternating-Relaxation-Oscillator
EGB-240-Alternating-Relaxation-Oscillator bill of materials (BOM)
16 components, 14 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CD40106B ~ | DIP-14 | U1 |
| 1 | PS1720P02 | PS1720P02 | X1 |
| 1 | ~ | BATT-3V | J1 |
| 1 | ~ | SS-12 | S1 |
| 2 | 1N4148 | DO35-P2.54 | D1, D2 |
| 2 | LED | LED_D5.0mm | D3, D4 |
| 1 | 0.1U 0.1u | CAP-RB-P2.0-D5.0 | C1 |
| 1 | 3.3U 3.3u | CAP-RB-P2.0-D5.0 | C2 |
| 1 | 1u | CAP-RB-P2.0-D5.0 | C3 |
| 1 | 2.2U 2.2u | CAP-RB-P2.0-D5.0 | C4 |
| 1 | 180K 180k | AXIAL-P10.16 | R1 |
| 1 | 1k | AXIAL-P10.16 | R2 |
| 1 | 1K2 1k2 | AXIAL-P10.16 | R3 |
| 1 | 120 | AXIAL-P10.16 | R4 |
EGB-240-Alternating-Relaxation-Oscillator design files
The KiCad project lives in the Nigel-Grommen/EGB-240-Alternating-Relaxation-Oscillator repository on GitHub; these links point at the commit this page was built from.
EGB-240-Alternating-Relaxation-Oscillator: common questions
How big is the EGB-240-Alternating-Relaxation-Oscillator PCB?
The EGB-240-Alternating-Relaxation-Oscillator measures 57.5 × 41 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the EGB-240-Alternating-Relaxation-Oscillator?
16 components, from 14 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the EGB-240-Alternating-Relaxation-Oscillator design files?
From the Nigel-Grommen/EGB-240-Alternating-Relaxation-Oscillator repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the EGB-240-Alternating-Relaxation-Oscillator design in my own project?
The repository has no license, so all rights stay with Nigel-Grommen. Use it as a reference, and ask the author before reusing the design.
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