Beeper timer , 555 ?

[Phil]

Hello
I have need for a timer that would be used to turn a 12 v. beeper device
on for one second or less and then off for 10- 30 seconds and then back to
beeper , looked at a bunch of 555 IC circuits and hate to spend a day
experimenting to get the right combo. , as an old HAM , I used to love the
challenge , even looked at using a timed relay , most of the 555 circuits
are 50/50 and that won't do , any ideas would be appreciated .
Phil L.

 

[Frank Buss]

I have need for a timer that would be used to turn a 12 v. beeper device
on for one second or less and then off for 10- 30 seconds and then back to
beeper , looked at a bunch of 555 IC circuits and hate to spend a day
experimenting to get the right combo. , as an old HAM , I used to love the
challenge , even looked at using a timed relay , most of the 555 circuits
are 50/50 and that won't do , any ideas would be appreciated .

A good idea would be to read the datasheet, e.g. this one:

http://focus.ti.com/lit/ds/symlink/tlc555.pdf

Then take a look at the schematic at page 9 and the formulas at page 10 for
the duty cycle.

For more flexibility and one-chip solutions (you'll need two 555s for your
application) you can use a microcontroller.

 

[Fred Bloggs]

I have need for a timer that would be used to turn a 12 v. beeper device
on for one second or less and then off for 10- 30 seconds and then back to
beeper , looked at a bunch of 555 IC circuits and hate to spend a day
experimenting to get the right combo. , as an old HAM , I used to love the
challenge , even looked at using a timed relay , most of the 555 circuits
are 50/50 and that won't do , any ideas would be appreciated .

That would be something like this:
View in a fixed-width font such as Courier.

 

[Hot Jock]

A good idea would be to read the datasheet, e.g. this one:

http://focus.ti.com/lit/ds/symlink/tlc555.pdf

Then take a look at the schematic at page 9 and the formulas at page
10 for the duty cycle.

For more flexibility and one-chip solutions (you'll need two 555s for
your application) you can use a microcontroller.

A 556 would be a one-chip solution!

 

[Frank Buss]

A 556 would be a one-chip solution!

Yes, and maybe the cheapest solution, too, if you don't need more
flexibility of a microcontroller. The advantage of a microcontroller would
be that there are some chips with integrated oscillator, which means that
you don't need any external component. The 556 solution needs many external
resistors and capacitors.

 

[John Fields]

A 556 would be a one-chip solution!

 

[Frank Buss]

A 555 is a one chip solution.

Did you not see Fred Bloggs' contribution?

My understanding of the OP was, that he needs to generate the square wave
for the beeper, too.

 

[John Fields]

Yes, and maybe the cheapest solution, too, if you don't need more
flexibility of a microcontroller. The advantage of a microcontroller would
be that there are some chips with integrated oscillator, which means that
you don't need any external component. The 556 solution needs many external
resistors and capacitors.

---
There is no need for a 556, and the slick 555 solution needs exactly
one 555, two resistors, one capacitor, and one diode.

The µC solution you propose needs one µC, one device programmer and,
depending on how smart one is, a more or less huge effort required
to climb the learning curve the first time out.

Also, note that Fred Bloggs posted a circuit which will work when
assembled with the components shown while you haven't even offered a
suitable µC or posted code which would do the job.

 

[donald]

Hello
I have need for a timer that would be used to turn a 12 v. beeper device
on for one second or less and then off for 10- 30 seconds and then back to
beeper , looked at a bunch of 555 IC circuits and hate to spend a day
experimenting to get the right combo. , as an old HAM , I used to love the
challenge , even looked at using a timed relay , most of the 555 circuits
are 50/50 and that won't do , any ideas would be appreciated .
Phil L.

One 555 would do it as there seems to be no requirement to toggle the
beeper device.

However there seems to be a requirement to control the OFF time.

So a pot would be nice addition.

Also, the 12V beeper is most likely a high current device.

I also noticed that the OP has not chimed in yet.


donald

 

[Fred Bloggs]

One 555 would do it as there seems to be no requirement to toggle the
beeper device.

However there seems to be a requirement to control the OFF time.

So a pot would be nice addition.

Also, the 12V beeper is most likely a high current device.

I also noticed that the OP has not chimed in yet.


donald

Right, well you can invert the duty cycle, parallel some 555 outputs,
and add adjustment like so:
View in a fixed-width font such as Courier.

 

[neon]

you need two timers one for the on-off and one for beeping frequency a 556 is the choice then as sugested.

 

[Phil]

Thanks for all the info. , I have built many 555 pulsers to run servos etc.
, I have enough schematics now to go with , had something in my basement
that required an alarm , just didn't want it on solid and drive me out of
the house , thanks to all for your thoughtful comments , I love the NG 's
and wonder why more folks don't use them ?.
Best To All
Phil L.

One 555 would do it as there seems to be no requirement to toggle the
beeper device.

However there seems to be a requirement to control the OFF time.

So a pot would be nice addition.

Also, the 12V beeper is most likely a high current device.

I also noticed that the OP has not chimed in yet.


donald

Right, well you can invert the duty cycle, parallel some 555 outputs, and
add adjustment like so:
View in a fixed-width font such as Courier.

.
.
.
.
. 12V
. |
. |
. .----------+---------+-----------+------.
. | | | | |
. |_ .--|---------|--------. | ---+---
. \/| | | | | | | 12V |
. /500k | | ------+---555 | | | beeper|
. /\ | | | Vcc | | | | |
. | | '--|Rst | | | ---+---
. | 1N914 | | | | | |
. +-|>|---+-----|Dis Out|--+--|------'
. | | | |
. | | | |
. [15k] .--|Thresh | |
. | | | | 0.1u|
. +----------+--|Trig | ===
. | | | |
. | .--|Ctl | |
. | | | | |
. 100u|+ 0.1u| | GND | |
. === === ------------ |
. 16WVDC| | | |
. | | | |
. '----------+----------+----------'
. com
.
.
.