I'm trying to get a 12 VDC sub-circuit to function that will activate a buzzer at the completion of a task and the power has been cut to the main circuit. The buzzer should sound for about 10 - 15 seconds before turning off. I've accomplished this with a capacitor bank; but the buzzer doesn't cut off below a certain voltage (5 - 8 volts) and continues operating with a sick fade out sound. Then I read that transistors could be used as a switch; but I'm getting the same effect, just with extra hardware in the circuit.
My background is primarily mechanical in nature, with my electrical experience being AC residential around my house. The last time I tried learning electronics was 45-years ago, which was a disaster due to a teacher that literally said to me, "These pliers are not meant for holding things."
I've attached the sub-circuit schematic as it currently stands. The amp readings are with a LED instead of the buzzer. I've also attached the data sheets of the components I'm using. I've run out of ideas; yet I'm certain something like has to be fairly common using analog components.
Thanks for the help.
My background is primarily mechanical in nature, with my electrical experience being AC residential around my house. The last time I tried learning electronics was 45-years ago, which was a disaster due to a teacher that literally said to me, "These pliers are not meant for holding things."
I've attached the sub-circuit schematic as it currently stands. The amp readings are with a LED instead of the buzzer. I've also attached the data sheets of the components I'm using. I've run out of ideas; yet I'm certain something like has to be fairly common using analog components.
Thanks for the help.
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