Bleep once then continue to flash

[aallan]

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.

 

[mister_rf]

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

 

[aallan]

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]

Can you post the schematics you are using?


Btw,see here for example: