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STD 555 timer audio alarm circuits
License: GPL 3.0
Mode: Editors' pick
- 0
Update time：
2021-04-05 08:22:01
Creation time：
2017-12-14 04:05:11
Description
We have many ways to build the buzzer sound circuit. We used to build them with the transistors. But now we like to use the IC-555 timer more than. Raed more : [**555 timer audio alarm circuits**](https://www.eleccircuit.com/555-timer-audio-alarm-circuits/)
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 6.8K | R1 | AXIAL-0.3 | 1 |
| 2 | 2.7K | R2 | AXIAL-0.3 | 1 |
| 3 | 22K | VR1 | RES-ADJ_3386P | 1 |
| 4 | 3.3nF | C1 | RAD-0.1 | 1 |
| 5 | 4.7K | R3 | AXIAL-0.3 | 1 |
| 6 | 2N3904 | Q1 | TO-92(TO-92-3) | 1 |
| 7 | XFMR | T1 | NONE | 1 |
| 8 | Speaker Crystal | CRYSTAL | Speaker_Crystal | 1 |
| 9 | IC555 | U1 | DIP-08 | 1 |
| 10 | Header-Male-2.54_1x1 | 9+ | HDR-1X1/2.54 | 1 |
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