A Simple Transistor-Based Electronic Siren
Автор: Dilshan's Electronics Lab
Загружено: 2025-09-13
Просмотров: 228
This video shows how to build a transistor-based electronic siren that produces police, fire, and ambulance alarm effects. This circuit is designed as a simple replacement for the rare UM3561 siren IC, utilizing only standard transistors, through-hole type resistors, and capacitors.
We also designed a dedicated PCB for this project, which was sponsored by PCBWay. You can grab the PCB files and order your own board directly from PCBWay’s project sharing space: https://www.pcbway.com/project/sharep...
Full project details and schematic: https://jayakody2000lk.blogspot.com/2...
Content of the video:
00:00 - Top and bottom sides of the PCB
00:08 - Soldering resistors
01:37 - Soldering 1N4148 diodes
01:58 - Soldering electrolytic capacitors
02:14 - Soldering Mylar capacitors
02:39 - Soldering transistors
02:57 - Soldering trimpot
03:03 - Soldering pin-headers
03:14 - Assembled PCB
03:34 - Connecting 9V DC power source
03:42 - Connecting 32Ω speaker
03:51 - Testing and adjusting the tone
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