Rookie here. I'm trying make a non microcontroller circuit that gives about 5 quick beeps then roughly 1 second off, repeat. I'm running on 2 AAA batteries. I already have a bunch of cmos 555 on hand so been trying to make that work. I'm using a 3V active buzzer on 555 output switched on via transistor. I tried a few astable variations, the attached circuit with R1=1K (in series with variable resistor), R2=100K, C=10uF gave me the desired timing sequence but doesn't beep, just a steady on, 1 second off, repeat. What changes can I make to get the desired timing but with beeps.
Thanks,
Rich.

 

Welcome to AAC!

What changes can I make to get the desired timing but with beeps.

You need another astable that is controlled by the first timer.

Schematics without component values and pin functions labeled are of little use.

 

Welcome to AAC!

You need another astable that is controlled by the first timer.

Schematics without component values and pin functions labeled are of little use.

I can appreciate that (re: posting schematic). I know a 556 could do it, was just trying to see if there was a way for a solo 555 since i was seeing circuits like these (see attachment ) that suggested frequency could be adjusted separately from M/S ratio.

 

was just trying to see if there was a way for a solo 555

Nope. You need two oscillation periods (one at, say, 5Hz and the other at 2Hz).

 

Nope. You need two oscillation periods (one at, say, 5Hz and the other at 2Hz).

Thanks a lot guys appreicated.

 

Nope. You need two oscillation periods (one at, say, 5Hz and the other at 2Hz).

I tried this circuit and it works. I was advised to replace the 4011b with a 74HC193 and use a mosfet on the output to turn on the active buzzer. Would you agree with that assesment as i'm about to go order it, and could you recommend a suitable mosfet (part number) for this low current application. Thanks.

 

I was advised to replace the 4011b with a 74HC193

That's strange advice.
The 4011 should work fine.
The 74HC is faster but you don't need that here.

You likely can use the transistor you mentioned in you first post.
What's the transistor, and the buzzer load current?

 

I tried this circuit and it works. I was advised to replace the 4011b with a 74HC193 and use a mosfet on the output to turn on the active buzzer. Would you agree with that assesment as i'm about to go order it, and could you recommend a suitable mosfet (part number) for this low current application. Thanks.

Yes. The 74HC193 was a typo, and should have been 74HC132.

But based on the spec you provided on the other forum, two oscillators are not needed.
A single timer can be started at power-on, then reset after 5 clock cycles using an RC circuit.