Hi there I've been looking for a double beep circuit. For example something that would do two beeps quickly, back to back then a pause and repeat.

Any ideas on where i can start?

Many thanks!

 

Use a CMOS 555 timer wired as an astable multivibrator for a clock pulse to drive a 4017 5-stage Johnson counter. Use 10k Ohm resistors from the 1st and 3rd outputs to the base of a Darlington transistor that has its' emitter grounded, and connect the buzzer between the collector and +V.

 

Or two 555s, one fast, one slow, both oscillators.

 

Thanks guys - any diagrams to go with your answers? It would be of great help.

 

Have a look at the attached. I used a 4093 quad Schmitt trigger NAND instead of a 555 timer; makes for a low parts count. As shown, it gives 2 quick beeps every ~1.5 seconds.

Power connections to the ICs are not shown, neither are 0.1uF ceramic or poly bypass capacitors, which are required.

I don't know what kind of buzzer/beeper you'll use. This circuit should be good for one that requires up to 120mA at 12v.

 

Wicked thank you for taking the time SgtWookie - it really is appreciated. People like you help make the world turn round and be a better place.

Have a great day!

 

Cool - I've learned about Schmitt triggers and Decade counters now