Re: Need circuit to produce 3 modes of audible confirmation


"petrus bitbyter" <pieterkraltlaatditweg@xxxxxxxxxxxxxxxxx> schreef in
bericht news:4399c38d$0$20780$e4fe514c@xxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> "Jason S" <jst3712@xxxxxxxxxxxxxx> schreef in bericht
> news:439972f7_1@xxxxxxxxxxxxxxxxxxxxxx
>>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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