Breadboard View
Although in this example all the trigger switches are on this breadboard, in real life you may have to run wires to place the switches where they will be triggered.
First, build a small breadboard of the circuit, so you can see what is happening before you set up a DIY security silent alarm. The three momentary contact switches on the right half of the board are actually three separate triggers for the alarm. You could simply remove them and use long wires to place a contact switch anywhere you want to monitor.
Connect the negative ...
Get Essential 555 IC now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
