This DIY multi-zone alarm system has a "memory" feature. If the alarm activates - the circuit will remember which of its zones has caused the activation. This is very useful when you're trying to find a fault.
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One-Time-Only Alarm - Latching Zones

MORE ALARM CIRCUITS

One-Time-Only Alarm
Schematic
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Circuit Description

Memory Zones For The
One-Time-Only Alarm


Click Here For A Photo Of A Two-Zone Module.

Two-Zone Module
Veroboard Layout
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