• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

555 ic+output pulse after trigger pulse ends

Status
Not open for further replies.

Mindmywork

Member
im working on a circuit which will be triggered by cell phone audio output. im able to amplify the audio signal, the voltage has spikes in it from 1.6 to 4.5v when the ringtone is playing.
so can i take it as a input to 555 and get a pulse of 5 seconds as output.

output pulse should start after the ringtone ends.
 

crutschow

Well-Known Member
Most Helpful Member
output pulse should start after the ringtone ends.
You mean when the ringing totally stops or at the end of the first ring?
If at the end of the ringing, what is the period between rings?
 

alec_t

Well-Known Member
Most Helpful Member
How long does the ringtone last? Does it have gaps in it?
You might find you need two 555s: one triggered at the start of the ringtone and the other triggered when the pulse from the first one goes low.
 

Mindmywork

Member
You mean when the ringing totally stops or at the end of the first ring?
If at the end of the ringing, what is the period between rings?
after total ring stops. like i will call the mobile the ringtone plays and stops, after the ringtone stopped the output has to be triggered.
 

Mindmywork

Member
How long does the ringtone last? Does it have gaps in it?
You might find you need two 555s: one triggered at the start of the ringtone and the other triggered when the pulse from the first one goes low.
good idea. cant we do it with just a single 555
 

Mindmywork

Member
ringtone can be selected from files. but i dont know which sound form will get high voltage and has small spikes.
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top