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Siren Generator using IC UM3561
Make police siren circuit using 555 timer, transistors and op-amp Siren circuit page 2 : security circuits :: next.gr Siren kong transistors
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Make Police siren circuit using 555 timer, transistors and OP-AMP
Siren Generator using IC UM3561
POLICE SIREN - Basic_Circuit - Circuit Diagram - SeekIC.com
6 Simple transistor | police | ambulance Siren (audio alarm) circuits