REQ schematics for multivibrator

[Jeckson]

Great sonsivri

I didn't well with software manipulation.

Looking schematic multivibrator with NE555(cause wide rage VCC).
When I press switch then created squarewave or rectagle waveform.

at attachment

Thank you
Jeckson

[oldvan]

The answers to this are all readily available here:
GOOGLE: 555

 

[download_crux]

hi

this is small program for 555 multivibrators  ( with schematic)

 

[Jeckson]

Thank's

Oldvan

Where's the switch that didn't trespass the operation of that multivibrator?

The switch is only on time(or triggered) and produce the squarewave output.
Not on/off the IC's.

Sorry I forgot where my book that I keeped at rack for that info.

Thank you
Jeckson

NB:
Download crux the files corrupt will download again.

[oldvan]

Three easy choices:

1) Switch can break the connection between pin 3 of the 555 and the MCU

2) Switch can pull pin 2 of the 555 to ground to stop its oscillation.

3) Switch can remove power from the 555.

Put a resistor of perhaps 1K between the 555 and MCU if their power supply voltages differ,
and a diode from MCU pin to MCU's VCC so the input of the MCU is not over-voltage.

I personally prefer solving the problem with software on the MCU and eliminating the 555 entirely.

[beque]

Here you will find every kind of circuit

[carbontracks]

Three easy choices:

1) Switch can break the connection between pin 3 of the 555 and the MCU

2) Switch can pull pin 2 of the 555 to ground to stop its oscillation.

3) Switch can remove power from the 555.

Also the 555 has a reset pin, which could be used for control.

[Jeckson]

Hai all

Sorry for not clear explanation...

Here's the info.

at 1...nothing is pressed..no pulse

at 2...switch A pressed then produce pulse.

at 3..switch B pressed then no pulse basically from Oldvan suggest..thank's Oldvan

2) Switch can pull pin 2 of the 555 to ground to stop its oscillation.

Where's I place switch A..do I need more components?

Thank you
Jeckson

[Jeckson]

Sorry

I added additional information..the switch A and B is momentary.

Jeckson

[pickit2]

I take it switch A feeds supply to 555.
If I get what you want to do, you only need 1 & 2 option 3 is same as 1
also what about level of voltage at output of 555 ?

I would try and post what you want to do with a bit more detail.
Also if your feeding a micro controller what about the voltage level.

[Jeckson]

I take it switch A feeds supply to 555.

I'm thinking same..but the SWICTH A is momentary or pulse or trigger...

THank you
Jeckson

[Parmin]

if you want the switch as a momentary, use a SCR for power input,
Switch A is to be a NO, placed in the Gate,
and switch B is to be a NC, to cut out the supply to SCR.

You may want to add some load to increase the SCR current so it will latch.

Otherwise, use another 555 for RS switching

[Jeckson]

I will tried in someways..download_crux could you post another  555-Timer.rar

Jeckson

[Jeckson]

download_crux could you post another  555-Timer.rar

The cann't decompress...please upload again.
I tried to made the minimum parts with multivibrator.

Jeckson

[pickit2]

Jeckson original site for 555-Timer.rar
http://clarkson-uk.com/downloads/555-Timer.rar
or main site here
http://555-timer.clarkson-uk.com/

[solutions]

What you are asking for is extremely basic...if you don't start doing your own research and gain an understanding of the simple things you will be hopelessly lost for the more complex.

That said, if you insist on being spoonfed: http://www.utm.edu/staff/leeb/3b3.htm

[Jeckson]

What you are asking for is extremely basic...if you don't start doing your own research and gain an understanding of the simple things you will be hopelessly lost for the more complex.

Looking for minimum parts....

That said, if you insist on being spoonfed: http://www.utm.edu/staff/leeb/3b3.htm

Not like that

at the website of http://www.utm.edu/staff/leeb/3b3.htm
Shown below is the pinout for the 555 timer and how it can be configured to operate as a monostable multivibrator.   This one-shot is non-retrigerable.

Thank's
Jeckson

[solutions]

Looking for minimum parts....

Thank's
Jeckson

In that case, use an 8 pin PIC

[Parmin]

or a 6 pin pic 10F

Jeckson, i fell that you are a bit out of your depth here.
I am sure for a small fee someone would be glad to design anything and everything for you.

[pickit2]

The device he is looking for is the yet to be defined, that is of couse the very rare "maybe gate", not to be confused with fuzzy logic.
I have the feeling this is a school project. from the first post it is hard to see what his aim of the project is.
Options are:
1. Input to port with 3 states: hi, low, or clock (Not said what Frequencey is needed)
2. clock for MCU (but no Frequencey is asked for, I don't think this is what he is asking for as most MCU have internal clocks or have xtal)
3. if you have to guess as to what the poster is needing, then maybe right answers should not be given, untill you have a valid question to be answered.

[Jeckson]

Hai
PICkit2,Parman and solution

I apologize that there's missunderstand about it.The schematics was solved but I tried minimum parts.

Not only for MCU but also for simple FM transmitter..

at http://pacarita1us.wordpress.com maybe little bit explain.

Yes..seems that high school project.That's for my poor friend who's lived at slump region at my town who's always fishing for everyday meals. Perhaps someone order and he built that.

Regards
Jeckson

[oldvan]

I thought I'd located a hex maybe gate,

But it turned out to be a hex BABY gate.


OK, I think I understand now.



Seriously, minimum parts and minimum size could be a PIC10F202 in a SOT-23-6 package.
Would not eat as much power as a 555 and can program to meet your needs.

[solutions]

oldvan:  Looks like you have two pretty big noise sources inside that hex gate of yours. You'll also get crappy outputs from them. 

Nothing a couple of one-shots won't fix, though

[Ichan]

Simple things sometimes intriguing, and I understand the difficulties on sourcing "sophisticated" components in his place (Makassar?)

So here is my trial with the objective are minimum cost and easy to find components, at least it works on Proteus. Just don't push the two buttons at the same time - that's your home work  .

-ichan

[solutions]

I think you're going to want a limiting resistor on that two button path Ichan ...in case someone decides to run it off a car battery (you never know what they may sub for a "battery" in backwoods places).

His spec was minimum component count, not cost, so I'm not sure how this ckt beats the 6 pin PIC, or even Oldvan's hex gate idea (unless Jeckson can't live with having two pulses there.... ).