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Bleep once then continue to flash

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aallan

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Hi All,

I have designed the circuit below. After some time, the top signal into the AND gate goes HIGH, causing the leds to flash and the buzzer to beep.

I need to adapt the circuit so that when the top signal into the AND gate goes HIGH, the buzzer beeps once only (or only a few times) then stops, while the LEDs continue to flash.

Any ideas?

I though about a one-shot 555 Timer but I'm not sure. If it helps, the two signals into the AND gate are from a 4060 Timer IC.

Thanks.

circuit.JPG
 

mister_rf

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You can use different outputs from the CD4060 in order to generate separate timings for the LEDs and the buzzer…
 

aallan

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Thanks mister_rf,

I had considered this but the top signal into the AND gate can come from any input of the 4060 (user selectable timing) so building a big logic circuit with all the inputs will get very messy very quickly and is too compelx for this application.

Any other ideas?
 

mister_rf

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Can you post the schematics you are using?


Btw,see here for example:
 

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