Hi All,
After a bit of googling I managed to cobble together the following circuit...
which works as required, I am however trying to make it as versatile as possible and allow plenty of adjustments/tuning.
I can adjust the mic gain with R5 and the tone required to activate the LM567 with R7. I know I can replace R9 with a pot to adjust the latch output time. What I don't know is how to change to number of pulses/length of pulse needed to activate the latch.
The tone the mic is picking up can be anything from a single beep which is about 200ms in length to a constant stream of beeps that sounds like a continuous tone. The circuit fires fine on a single beep, so what I would like to do is be able to adjust it so that it only fires on 5 beeps or a continuous tone of about 1 second.
Finally I had to put much larger values for the Power-on reset for the 555 than the suggested norm (10K/0.1uF) to stop it firing on power up. Any ideas why?
Thanks in advance for any help you can give a newbie.
Les
After a bit of googling I managed to cobble together the following circuit...
I can adjust the mic gain with R5 and the tone required to activate the LM567 with R7. I know I can replace R9 with a pot to adjust the latch output time. What I don't know is how to change to number of pulses/length of pulse needed to activate the latch.
The tone the mic is picking up can be anything from a single beep which is about 200ms in length to a constant stream of beeps that sounds like a continuous tone. The circuit fires fine on a single beep, so what I would like to do is be able to adjust it so that it only fires on 5 beeps or a continuous tone of about 1 second.
Finally I had to put much larger values for the Power-on reset for the 555 than the suggested norm (10K/0.1uF) to stop it firing on power up. Any ideas why?
Thanks in advance for any help you can give a newbie.
Les