Siren circuit
3 Tone siren
Police
Fire
Ambulance
Parts list D400 1uf-1
270K-1 bc548-4 10uf-2
33K-1 A933-2 103-3
3.3K-3
22K-1 LED-1
1k-1 1w sp
100k-1
27k-2
470k-1
470 oms-1
Power guard circuit
230V under an over voltage protection
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