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Author Topic: REQ schematics for multivibrator  (Read 4512 times)
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Jeckson
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« on: August 10, 2010, 12:24:06 12:24 »

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
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oldvan
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« Reply #1 on: August 10, 2010, 03:15:13 15:15 »

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

 Grin

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« Reply #2 on: August 11, 2010, 04:46:24 04:46 »

hi

this is small program for 555 multivibrators  ( with schematic)

 Tongue Grin
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Jeckson
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« Reply #3 on: August 11, 2010, 05:42:34 05:42 »

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.





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oldvan
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« Reply #4 on: August 11, 2010, 11:47:11 11:47 »

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.

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beque
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« Reply #5 on: August 11, 2010, 02:23:15 14:23 »

Here you will find every kind of circuit
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carbontracks
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« Reply #6 on: August 11, 2010, 02:34:37 14:34 »

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.
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Jeckson
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« Reply #7 on: August 12, 2010, 04:54:33 04:54 »

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
Quote
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

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Jeckson
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« Reply #8 on: August 12, 2010, 02:15:53 14:15 »

Sorry

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

Jeckson
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pickit2
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« Reply #9 on: August 12, 2010, 02:49:44 14:49 »

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.
« Last Edit: August 12, 2010, 02:56:32 14:56 by pickit2 » Logged

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Jeckson
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« Reply #10 on: August 13, 2010, 09:51:10 09:51 »

Quote
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
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Parmin
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« Reply #11 on: August 14, 2010, 03:38:48 03:38 »

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
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Jeckson
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« Reply #12 on: August 14, 2010, 03:52:04 03:52 »


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

Jeckson
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Jeckson
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« Reply #13 on: August 16, 2010, 11:36:37 11:36 »

Quote
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
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pickit2
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« Reply #14 on: August 16, 2010, 12:17:00 12:17 »

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/
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solutions
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« Reply #15 on: August 16, 2010, 07:55:42 19:55 »

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
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Jeckson
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« Reply #16 on: August 18, 2010, 09:56:52 09:56 »

Quote
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....

Quote
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
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solutions
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« Reply #17 on: August 18, 2010, 10:12:22 10:12 »

Looking for minimum parts....

Thank's
Jeckson

In that case, use an 8 pin PIC
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« Reply #18 on: August 18, 2010, 11:26:08 11:26 »

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.

« Last Edit: August 18, 2010, 11:31:31 11:31 by Parmin » Logged

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« Reply #19 on: August 18, 2010, 12:30:09 12:30 »

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.
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Jeckson
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« Reply #20 on: August 18, 2010, 01:55:15 13:55 »

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



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oldvan
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« Reply #21 on: August 18, 2010, 04:36:18 16:36 »

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.
« Last Edit: August 18, 2010, 04:59:25 16:59 by oldvan » Logged

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« Reply #22 on: August 18, 2010, 08:49:04 20:49 »

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
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« Reply #23 on: August 18, 2010, 08:50:27 20:50 »

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  Wink.

-ichan
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« Reply #24 on: August 18, 2010, 10:00:24 22:00 »

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.... Grin).
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