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  1. M

    Police Siren

    Hello to to you all, I am quite new as hobbyist to small electronics so please be gentle with comments. I have tried to assemble the shown "police siren" circuit with 9V battery (10k, 68k, 1k to bridge the two ne555 and two 1k for second NE555 with 104 and 10 microF) and I have no sound out of...