| Author |
Message |
Jason S
Guest
|
 Posted:
Fri Dec 09, 2005 5:35 pm Post subject:
Need circuit to produce 3 modes of audible confirmation |
|
|
I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
I want to be able to add it to practically any circuit which will provide
audible confirmation of the circuit's current operation. I was thinking of
using a PIC to do this, but is last resort (as I know absolutely nothing
about them).
Has anyone got any suggestions?
Thanks.
|
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|
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petrus bitbyter
Guest
|
| Posted:
Fri Dec 09, 2005 11:44 pm Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
"Jason S" <jst3712@iprimus.com.au> schreef in bericht
news:439972f7_1@news.iprimus.com.au...
| Quote: | I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
I want to be able to add it to practically any circuit which will provide
audible confirmation of the circuit's current operation. I was thinking
of using a PIC to do this, but is last resort (as I know absolutely
nothing about them).
Has anyone got any suggestions?
Thanks.
|
A PIC, even the smallest one is the most simple solution... once you can
program it and program it. That's to say you need the skills and the
equipment. If you like to make more of this type of circuits the investment
wil sure pay off. Otherwise, a bunch of 555s may do the job as well.
- One astable (1) for the beep timing (let's say 0.4s on and 0.4s off once
enabled)
- One monostable (1). Triggered by 'ON', enabling the astable (1) for 0.6s.
- One monostable (2). Triggered by 'OFF', enabling the astable (1) for 1.4s.
- One monostable (3). Triggered by 'ERROR', enabling the astable (1) for
2.2s.
- One astable (2) optional to produce a 1kHz beebfrequency once enabled by
astable (1).
The most straightforward way to control astable(1) by the three monostables
is a 3-input OR-gate (or NAND).
petrus bitbyter |
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petrus bitbyter
Guest
|
| Posted:
Fri Dec 09, 2005 11:50 pm Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
"petrus bitbyter" <pieterkraltlaatditweg@enditookhccnet.nl> schreef in
bericht news:4399c38d$0$20780$e4fe514c@dreader25.news.xs4all.nl...
| Quote: |
"Jason S" <jst3712@iprimus.com.au> schreef in bericht
news:439972f7_1@news.iprimus.com.au...
I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
I want to be able to add it to practically any circuit which will provide
audible confirmation of the circuit's current operation. I was thinking
of using a PIC to do this, but is last resort (as I know absolutely
nothing about them).
Has anyone got any suggestions?
Thanks.
A PIC, even the smallest one is the most simple solution... once you can
program it and program it. That's to say you need the skills and the
equipment. If you like to make more of this type of circuits the
investment wil sure pay off. Otherwise, a bunch of 555s may do the job as
well.
- One astable (1) for the beep timing (let's say 0.4s on and 0.4s off once
enabled)
- One monostable (1). Triggered by 'ON', enabling the astable (1) for
0.6s.
- One monostable (2). Triggered by 'OFF', enabling the astable (1) for
1.4s.
- One monostable (3). Triggered by 'ERROR', enabling the astable (1) for
2.2s.
- One astable (2) optional to produce a 1kHz beebfrequency once enabled by
astable (1).
The most straightforward way to control astable(1) by the three
monostables is a 3-input OR-gate (or NAND).
petrus bitbyter
|
Oops, forget the NAND as you have no inverted outputs.
petrus bitbyter
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Rich Grise
Guest
|
| Posted:
Sat Dec 10, 2005 1:15 am Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
On Fri, 09 Dec 2005 23:05:05 +1100, Jason S wrote:
| Quote: | I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
I want to be able to add it to practically any circuit which will provide
audible confirmation of the circuit's current operation. I was thinking of
using a PIC to do this, but is last resort (as I know absolutely nothing
about them).
Has anyone got any suggestions?
|
Well, a PIC would certainly keep the chip count down! But, you have the
investment of maybe $100.00 for the development system, and the time it
takes to learn the programming language, which, if you're a programmer,
shouldn't be hard at all. And the act of selecting which PIC you want
to use is an exercise in itself. :-)
The only other way that springs to my mind is a pot-load of counters
and logic gates and stuff, which sounds like a dandy exercise for the
reader. ;-)
Good Luck!
Rich |
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petrus bitbyter
Guest
|
| Posted:
Sat Dec 10, 2005 1:36 am Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
"Rich Grise" <richgrise@example.net> schreef in bericht
news:pan.2005.12.09.19.19.26.664237@example.net...
| Quote: | On Fri, 09 Dec 2005 23:05:05 +1100, Jason S wrote:
I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
I want to be able to add it to practically any circuit which will provide
audible confirmation of the circuit's current operation. I was thinking
of
using a PIC to do this, but is last resort (as I know absolutely nothing
about them).
Has anyone got any suggestions?
Well, a PIC would certainly keep the chip count down! But, you have the
investment of maybe $100.00 for the development system, and the time it
takes to learn the programming language, which, if you're a programmer,
shouldn't be hard at all. And the act of selecting which PIC you want
to use is an exercise in itself. :-)
The only other way that springs to my mind is a pot-load of counters
and logic gates and stuff, which sounds like a dandy exercise for the
reader. ;-)
Good Luck!
Rich
|
Well, Rich,
I have to disagree on some points. As for a development system, you can find
all on the net. For free. A programmer (the equipment, not the man) can be
build for much less then $100. Free schematics and plans on the net. The
investment will be in time. Knowing nothing of PICS is not a real problem
but knowing nothing of micros and programming is a pretty high hurdle.
Another way I pointed out in a previous posting. If you use NE556 you can do
with two or three chips (and a pot of resistors and caps :)
petrus bitbyter |
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Rich Grise
Guest
|
| Posted:
Sat Dec 10, 2005 1:37 am Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
On Fri, 09 Dec 2005 23:01:46 +0100, petrus bitbyter wrote:
| Quote: | "Rich Grise" <richgrise@example.net> schreef in bericht
On Fri, 09 Dec 2005 23:05:05 +1100, Jason S wrote:
I need to make a circuit that will produce either one, two or three
short consecutive beeps depending on the input signal it recieves. For
example:
Input 1 = One beep (could mean 'ON'). Input 2 = Two beeps (could
mean 'OFF'). Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be
nice.
I want to be able to add it to practically any circuit which will
provide audible confirmation of the circuit's current operation. I
was thinking of
using a PIC to do this, but is last resort (as I know absolutely
nothing about them).
Has anyone got any suggestions?
Well, a PIC would certainly keep the chip count down! But, you have the
investment of maybe $100.00 for the development system, and the time it
takes to learn the programming language, which, if you're a programmer,
shouldn't be hard at all. And the act of selecting which PIC you want
to use is an exercise in itself. :-)
The only other way that springs to my mind is a pot-load of counters
and logic gates and stuff, which sounds like a dandy exercise for the
reader. ;-)
I have to disagree on some points. As for a development system, you can
find all on the net. For free. A programmer (the equipment, not the man)
can be build for much less then $100. Free schematics and plans on the
net. The investment will be in time. Knowing nothing of PICS is not a
real problem but knowing nothing of micros and programming is a pretty
high hurdle.
|
OK, fair enough. I haven't personally attacked that hurdle, because I
haven't really had that much incentive to chase after it. :-)
| Quote: | Another way I pointed out in a previous posting. If you use NE556 you
can do with two or three chips (and a pot of resistors and caps :)
|
This is true - I made an SOS light once with about three chips - it was
very much like those amber flashers that you see on the "Under
Construction" signs, but this flashed "SOS" in Morse code
_ _ _ ___ ___ ___ _ _ _ _
___| |_| |_| |_| |_| |_| |_| |_| |_| |_____________| |_ ... etc.
I used "data selector logic" lifted almost directly from Don Lancaster's
TTL Cookbook.
The point of the project was, if you see flashing amber lights, on-off-on-
off, etc, then it means mechanical difficulties. If you see the SOS light,
it means a person in distress, so hurry up and call the ambulance. The
product never got off the ground, but it was fun to design!
And I got paid. :-)
Cheers!
Rich |
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Ken Smith
Guest
|
| Posted:
Sat Dec 10, 2005 3:18 am Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
In article <439972f7_1@news.iprimus.com.au>,
Jason S <jst3712@iprimus.com.au> wrote:
| Quote: | I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
|
How about a CMOS 22V10 and a couple of RCs ?
--
--
kensmith@rahul.net forging knowledge |
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Fred Bloggs
Guest
|
| Posted:
Sat Dec 10, 2005 9:20 am Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
| Quote: | I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
I want to be able to add it to practically any circuit which will provide
audible confirmation of the circuit's current operation. I was thinking of
using a PIC to do this, but is last resort (as I know absolutely nothing
about them).
Has anyone got any suggestions?
|
I get two logic chips, a 555, three diodes, one transistor, two
resistors, the usual 2xR+C 555 astable timing, and a beeper:
View in a fixed-width font such as Courier.
..
.. .------------------------------------------------------.
.. | |
.. | 3x 1N4148 |
.. | --------- |
.. IN 1----------------------+-|>|--+-[100K]-+----|RST OUT|----+
.. | | | | | | |
.. IN 2--------------------+-|-|>|--+ | | 555 | |
.. | | | | | | | |
.. IN 3--------------------|-|-|>|--+ | | ASTABLE | BEEPER
.. | | | | | | | |
.. .-|----------------|-|------+ | | ON TIME | |
.. | | | | | | | =BEEP | |
.. | | | | [100K] | | OFF TIME| ---
.. | | 4017 | | | | | 1/2 BEEP| ///
.. | | -------- | | | | ---------
.. | | | Q0| | | --- \|
.. | | |-- | | | /// 2N3904|---.
.. | '---|CE | | | <| |
.. | | | | | _ 4011 | |
.. | '1'-|CLK Q1|--------| \ --- |
.. | | | | | | o _ /// |
.. | | | | '--|_/ '-| \ |
.. | | | | _ | o--[100K]-+
.. | | Q2|--------| \ .-|_/ |
.. | | | | | o' |
.. | | | '----|_/ |
.. | | | |
.. | _ | Q3|--------------------[100K]-'
.. +-| \ | |
.. | | o|RST . |
.. +-|_/ | |
.. | Q9|
.. | |
.. --------
..
..
..
Any one of the inputs goes high and the 4017 and 555 are taken out of
RESET. The end of each beeper pulse clocks the 4017, outputs of which
are AND'ed with appropriate input line as necessary. When required
number beeps has occurred, transistor RSTs the 555, freezing it in LOW
state, and circuit remains locked up until all inputs are
removed-allowing 4017 to RESET. |
|
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|
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Fred Bloggs
Guest
|
| Posted:
Sat Dec 10, 2005 9:23 am Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
Ken Smith wrote:
| Quote: | In article <439972f7_1@news.iprimus.com.au>,
Jason S <jst3712@iprimus.com.au> wrote:
I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
How about a CMOS 22V10 and a couple of RCs ?
|
That's nonsense!- why do that when you can use the serial port on your PC. |
|
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|
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Don Foreman
Guest
|
| Posted:
Sat Dec 10, 2005 9:35 am Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
On Sat, 10 Dec 2005 01:26:08 GMT, Rich Grise <richgrise@example.net>
wrote:
| Quote: |
This is true - I made an SOS light once with about three chips - it was
very much like those amber flashers that you see on the "Under
Construction" signs, but this flashed "SOS" in Morse code
_ _ _ ___ ___ ___ _ _ _ _
___| |_| |_| |_| |_| |_| |_| |_| |_| |_____________| |_ ... etc.
I used "data selector logic" lifted almost directly from Don Lancaster's
TTL Cookbook.
The point of the project was, if you see flashing amber lights, on-off-on-
off, etc, then it means mechanical difficulties. If you see the SOS light,
it means a person in distress, so hurry up and call the ambulance. The
product never got off the ground, but it was fun to design!
And I got paid. :-)
I made a flashing bike light for my daughter in NYC using a red 1-watt |
Luxeon. She said she wanted bright. This sucker is bright!
I thought about having it flash: di di di di dah ..... dah dah di dah
(4Q) to show a little New Yawk attitude -- but I didn't have the
microcontroller ability to do that. Still don't but hope to soon.
Heck, a SOT23-6 10Fxxx PIC would have taken less space than the 555
I used. |
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|
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Fred Bloggs
Guest
|
| Posted:
Sat Dec 10, 2005 5:35 pm Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
Jason S wrote:
| Quote: | "Fred Bloggs" <nospam@nospam.com> wrote in message
news:439A4968.3070706@nospam.com...
I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
I want to be able to add it to practically any circuit which will provide
audible confirmation of the circuit's current operation. I was thinking
of using a PIC to do this, but is last resort (as I know absolutely
nothing about them).
Has anyone got any suggestions?
I get two logic chips, a 555, three diodes, one transistor, two resistors,
the usual 2xR+C 555 astable timing, and a beeper:
View in a fixed-width font such as Courier.
.
. .------------------------------------------------------.
. | |
. | 3x 1N4148 |
. | --------- |
. IN 1----------------------+-|>|--+-[100K]-+----|RST OUT|----+
. | | | | | | |
. IN 2--------------------+-|-|>|--+ | | 555 | |
. | | | | | | | |
. IN 3--------------------|-|-|>|--+ | | ASTABLE | BEEPER
. | | | | | | | |
. .-|----------------|-|------+ | | ON TIME | |
. | | | | | | | =BEEP | |
. | | | | [100K] | | OFF TIME| ---
. | | 4017 | | | | | 1/2 BEEP| ///
. | | -------- | | | | ---------
. | | | Q0| | | --- \|
. | | |-- | | | /// 2N3904|---.
. | '---|CE | | | <| |
. | | | | | _ 4011 | |
. | '1'-|CLK Q1|--------| \ --- |
. | | | | | | o _ /// |
. | | | | '--|_/ '-| \ |
. | | | | _ | o--[100K]-+
. | | Q2|--------| \ .-|_/ |
. | | | | | o' |
. | | | '----|_/ |
. | | | |
. | _ | Q3|--------------------[100K]-'
. +-| \ | |
. | | o|RST . |
. +-|_/ | |
. | Q9|
. | |
. --------
.
.
.
Any one of the inputs goes high and the 4017 and 555 are taken out of
RESET. The end of each beeper pulse clocks the 4017, outputs of which are
AND'ed with appropriate input line as necessary. When required number
beeps has occurred, transistor RSTs the 555, freezing it in LOW state, and
circuit remains locked up until all inputs are removed-allowing 4017 to
RESET.
Hi Fred, thanks for the schematic - very helpful. Did you come up with that
yourself? Just out of curiosity, have you tested the circuit? I haven't
had a chance to build it yet, but can't wait to see how it works - and
sounds like it will do the job. Most others have mentioned a PIC but I
haven't got the time for that. I will let you know how I went with your
schematic. Thanks again.
Jase.
|
No need to breadboard, these parts are too familiar. I did a
confirmation check in mixed-mode SPICE and it works as expected. What
kind of beeper are you working with?- there are several types- some are
self-oscillating so that all the 555 has to do is apply voltage to it,
others are just transducers and you have to supply the oscillatory
input. In the second case you will have to make a 555 oscillator at
2-3KHz to drive it, and use the 555 on the schematic to drive its RST
input- gating it on and off. I suppose a beep duration of 500ms ON and
250ms OFF should be about right- and that would be something like this:
View in a fixed-width font such as Courier.
..
..
.. TO <---------------------.
.. 4017 |
.. /CE |
.. 5V |
.. | |
.. .-----+--[270K]---+ |
.. | | | |
.. | [270K] +------------+ |
.. | | | VCC | |
.. | | | | |
.. FROM >----|-----|----|RST OUT|-+-> TO BEEPER
.. LOGIC | | | | .
.. | +----|THRESH | |
.. | | | | |
.. | +----|TRIG DIS|-. |
.. | + | | | | |
.. | === | GND | | |
.. | 1U| +------------+ | |
.. | | | | |
.. | '-----------+ | |
.. | | | |
.. | GND | |
.. | | |
.. '-------------------------' |
.. |
.. |
.. |
.. .---------------------------------'
.. |
.. |
.. |
.. | 5V
.. | |
.. .----|---+--[27K]----+
.. | | | |
.. | | [270K] +------------+
.. | | | | VCC |
.. | | | | |
.. | '---|----|RST OUT|--------.
.. | | | | |
.. | +----|THRESH | |
.. | | | | |
. | +----|TRIG DIS|-. PIEZO
. | | | | | |
. | === | GND | | |
. | 1n| +------------+ | |
. | | | | |
. | '-----------+-------|------'
. | | |
. | GND |
. | |
. '----------------------------
.
. |
|
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|
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Jason S
Guest
|
| Posted:
Sat Dec 10, 2005 5:35 pm Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
"Fred Bloggs" <nospam@nospam.com> wrote in message
news:439A4968.3070706@nospam.com...
| Quote: | I need to make a circuit that will produce either one, two or three short
consecutive beeps depending on the input signal it recieves.
For example:
Input 1 = One beep (could mean 'ON').
Input 2 = Two beeps (could mean 'OFF').
Input 3 = Three beeps (could mean 'ERROR')..
This is just an example. The 3rd one is not critical, but would be nice.
I want to be able to add it to practically any circuit which will provide
audible confirmation of the circuit's current operation. I was thinking
of using a PIC to do this, but is last resort (as I know absolutely
nothing about them).
Has anyone got any suggestions?
I get two logic chips, a 555, three diodes, one transistor, two resistors,
the usual 2xR+C 555 astable timing, and a beeper:
View in a fixed-width font such as Courier.
.
. .------------------------------------------------------.
. | |
. | 3x 1N4148 |
. | --------- |
. IN 1----------------------+-|>|--+-[100K]-+----|RST OUT|----+
. | | | | | | |
. IN 2--------------------+-|-|>|--+ | | 555 | |
. | | | | | | | |
. IN 3--------------------|-|-|>|--+ | | ASTABLE | BEEPER
. | | | | | | | |
. .-|----------------|-|------+ | | ON TIME | |
. | | | | | | | =BEEP | |
. | | | | [100K] | | OFF TIME| ---
. | | 4017 | | | | | 1/2 BEEP| ///
. | | -------- | | | | ---------
. | | | Q0| | | --- \|
. | | |-- | | | /// 2N3904|---.
. | '---|CE | | | <| |
. | | | | | _ 4011 | |
. | '1'-|CLK Q1|--------| \ --- |
. | | | | | | o _ /// |
. | | | | '--|_/ '-| \ |
. | | | | _ | o--[100K]-+
. | | Q2|--------| \ .-|_/ |
. | | | | | o' |
. | | | '----|_/ |
. | | | |
. | _ | Q3|--------------------[100K]-'
. +-| \ | |
. | | o|RST . |
. +-|_/ | |
. | Q9|
. | |
. --------
.
.
.
Any one of the inputs goes high and the 4017 and 555 are taken out of
RESET. The end of each beeper pulse clocks the 4017, outputs of which are
AND'ed with appropriate input line as necessary. When required number
beeps has occurred, transistor RSTs the 555, freezing it in LOW state, and
circuit remains locked up until all inputs are removed-allowing 4017 to
RESET.
|
Hi Fred, thanks for the schematic - very helpful. Did you come up with that
yourself? Just out of curiosity, have you tested the circuit? I haven't
had a chance to build it yet, but can't wait to see how it works - and
sounds like it will do the job. Most others have mentioned a PIC but I
haven't got the time for that. I will let you know how I went with your
schematic. Thanks again.
Jase. |
|
| Back to top |
|
|
Jason S
Guest
|
| Posted:
Sat Dec 10, 2005 5:35 pm Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
Thanks to everyone who has made suggestions.
Jase. |
|
| Back to top |
|
|
Ken Smith
Guest
|
| Posted:
Sat Dec 10, 2005 10:31 pm Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
In article <439AEEB8.6020200@nospam.com>,
Fred Bloggs <nospam@nospam.com> wrote:
In my never ending battle to save parts I suggest:
Modified version:
| Quote: |
.
.
. TO <-+-------------------.
. 4017 | |
. /CE | |
. | 5V |
. | | |
. | | |
. | | |
. [270K] +------------+ |
. | | VCC | |
. | | | |
. FROM >----------|----|RST OUT|-+-> TO BEEPER
. LOGIC | | |
. +----|THRESH |
. | | |
. +----|TRIG DIS|--------
. + | | | |
. === | GND | |
. 1U| +------------+ |
. | | |
. '-----------+ |
. | |
. GND |
. |
. |
. |
. |
. |
. .---------------------------------'
. |
. | --------------------------
. | | |
. | | 5V |
. | | | |
. | | | |
. | | | |
. | [270K] +------------+ |
. | | | VCC | |
. | | | | |
. '---+ |RST OUT|--------+
. | | | |
. +----|THRESH | |
. | | | |
. +----|TRIG DIS|- PIEZO
. | | | |
. === | GND | |
. 1n| +------------+ |
. | | |
. '-----------+--------------'
. |
. GND
.
.
.
BTW: I'd use a ceramic for the 1uF. There is a lot less risk of putting |
it in backwards that way.
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kensmith@rahul.net forging knowledge |
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Ken Smith
Guest
|
| Posted:
Sun Dec 11, 2005 4:55 am Post subject:
Re: Need circuit to produce 3 modes of audible confirmation |
|
|
In article <439B9908.2010103@nospam.com>,
Fred Bloggs <nospam@nospam.com> wrote:
This will work too:
| Quote: |
.
.
. TO <-----------------------------.
. 4017 |
. /CE |
. 5V |
. | |
. .---[330K]--+ |
. | | |
. +-----------|---------. |
. | | | |
. [120K] +------------+ | |
. | | VCC | | |
. | | | | |
. FROM >+---------|RST OUT|---------+
. LOGIC | | | | | |
. CKT --- +----|THRESH | | |
. --- | | | | |
. 0.5 | +----|TRIG DIS|---' |
. ----+ | | |
. | | | |
. | | CONT| |
. | | | |
. + | | | |
. === | GND | |
. 1U| +------------+ |
. | | |
. '-----------+ |
. | |
. GND |
. \|/
.
. to RST of
. piezo astable
|
When RST goes high, the 0.5u puts the trigger at Vcc/3.
BTW: You can make pulsing beep with just one 555. Unfortunately, there
is no easy way to do the CD4017 running from it. It looks like this:
100K 10K 100K 10K 1u
Vcc -/\/\/-+-/\/\-+-/\/\-+---+--/\/\--!!--+---- Output
! ! ! ! !
! 10u --- 0.1--- ! !
! --- --- ! !
! ! ! +- !
! GND GND ! ! !
! ! ! !
--------------------------------------
! D T T Q !
! i r h !
! s g r !
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