555 is Not a Timer nor an Oscillator

[underprezzure]

minsan po try ko mgcalculate khit sa 555 timer.. ung resistor at capacitor..  aun, mas ok po tlga ang calculated values.. kesa trial and error...

hehehe.. wow naapreciate mo na ang numbers.. sige tuloy mo lang .. masarap ang lasa ng numbers..   nga pala 555 timers.. i posted detailed mathematical equations dito sa forum.. ito ang link oh

http://www.electronicslab.ph/forum/index.php?topic=4750.msg82722#msg82722

Tama po si sir nomad13. 555 astable ang kailangan mo since pulsating "low" and "high" configuration ito. Things to remember in astable operation of 555 IC.


1. Do not expect that the Mark time(tm) is always equal to Space time(ts). Ibig sabihin duration ng state "high" is not equal to the duration of the state "low". But there is a way to make it closiest as possible.

          where , Mark time (output high): Tm = 0.7 × (R1 + R2) × C1
                    Space time (output low): Ts  = 0.7 × R2 × C1

2. Period(T) = 0.7 * (R1 + 2R2) * C1
       where R1, resistor from pin7 directed to the Vcc
                R2, resistor connected from pin7 to pin2
                C1, capacitor connected from pin2 to ground

3. Frequency(f) = 1.4 /[(R1+2R2) *C1] with variable definition the same as stated above

4. Period(T) is also = Tm(on_state) + Ts(off_state)

Note: To make the two states almost equal then you have to make R2 >>>>>> R1. Palakihin ang R2 ng todo.

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[glutnix_neo]

eto magandang calculator, may freeware version sila

http://www.schematica.com/555_Timer_design/555_Timer_PRO.htm


Just don't expect magagamit mo tong calculator na to sa mga circuits shown below, nyahahahahahaha

[Woots29]

eto magandang calculator, may freeware version sila

http://www.schematica.com/555_Timer_design/555_Timer_PRO.htm


Just don't expect magagamit mo tong calculator na to sa mga circuits shown below, nyahahahahahaha

hahaha! oo nga

[macky]

eto magandang calculator, may freeware version sila

http://www.schematica.com/555_Timer_design/555_Timer_PRO.htm


Just don't expect magagamit mo tong calculator na to sa mga circuits shown below, nyahahahahahaha

saan naman po pwedeng gamitin yang calculator na yan? sa simple circuits like LED blinkers?

sayang pa time pag-calculate kung LED blinker lang ang paggagamitan...heheheh

[Woots29]

saan naman po pwedeng gamitin yang calculator na yan? sa simple circuits like LED blinkers?

sayang pa time pag-calculate kung LED blinker lang ang paggagamitan...heheheh

hindi lng blinkers application nyan. (may LED kc sa simulation) xempre nndun din duty cycle at rise and fall of pulse.

[macky]

hindi lng blinkers application nyan. (may LED kc sa simulation) xempre nndun din duty cycle at rise and fall of pulse.

thanks! 

[Lenjei]

hehehe.. wow naapreciate mo na ang numbers.. sige tuloy mo lang .. masarap ang lasa ng numbers..   nga pala 555 timers.. i posted detailed mathematical equations dito sa forum.. ito ang link oh

http://www.electronicslab.ph/forum/index.php?topic=4750.msg82722#msg82722

thaks po.. eh un nmn po kasi tlga ang mganda ung may computed value.. ewan ko nga b s mga prof ditu kung bket hindi nila turo un.. 

[underprezzure]

thaks po.. eh un nmn po kasi tlga ang mganda ung may computed value.. ewan ko nga b s mga prof ditu kung bket hindi nila turo un.. 

sakim sila ! ayaw nila i-share sa iba.. for sure alam din naman siguro ang basic calculation.. self study na lang.. hehehe 

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[Woots29]

sakim sila ! ayaw nila i-share sa iba.. for sure alam din naman siguro ang basic calculation.. self study na lang.. hehehe 

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wel may narinig akong prof eto sinabi: "if they're interested to learn more, they'll have to self-study and research."

[macky]

wel may narinig akong prof eto sinabi: "if they're interested to learn more, they'll have to self-study and research."

i agree with that!

experience ko yan nung nag-aaral pa ako ng computer programming, ang daming hindi itinuturo kaya self-study ako, hanap ako ng mga books na national bookstore yun kay Peter Norton books, C, Assembly, etc... kaya mas advance ako nun kesa sa klasmeyts ko!

[Woots29]

hehehe. bos pwedeng pagawa sau ng prog na cocontrolin nya parallel port for free 

[Lenjei]

sakim sila ! ayaw nila i-share sa iba.. for sure alam din naman siguro ang basic calculation.. self study na lang.. hehehe 

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gnun n nga lng po tlga.. at un tlga ang ginagawa nmin ditu.. haay.. kung pwede lng silng plitan .. ginawa n nmin.. 

[maldihtah13]

hehehe. bos pwedeng pagawa sau ng prog na cocontrolin nya parallel port for free 

bakit mo pa iaasa sa iba kung available na cya. Marami demo code sa planet source code.

[underprezzure]

bakit mo pa iaasa sa iba kung available na cya. Marami demo code sa planet source code.

Tama. iilang lines lang ng codes yan. sending data to the parallel port can be done in exactly one line of code. without counting the default commands for Visual basic.

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[underprezzure]

wel may narinig akong prof eto sinabi: "if they're interested to learn more, they'll have to self-study and research."

HALA OFF TOPIC TAYO NETO:      

Contextual in meaning naman kasi yan. Well,  sa university namin default na talaga na maraming alam ang professor pero since culture na rin sa school namin na super basic lang talaga ang ituturo kaya ayon self study and panay research ang ginagawa namin. Pero not all university in our country has this kind of culture that is where i would say na contextual in meaning ang "if they're interested to learn more". To what extent is learning lesser than the "more" that we are thingking off. Pag magtuturo ako ng physics and then ituturo ko lang ang basics ng EM principle tapos magbibigay ako ng exam na combination ng quatum EM with Maxwell equations,, sa tingin niyo enough ba at makatarungan yon? of course, iiyak si fafa niyan dahil nose bleed talaga lahat ng fafa at mama sa exms.. it is good to learn more given that the basics are well defined to each students. but learning more when you do not have anything in your pocket then that is a different story...

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[Ikasamoko]

ito yung 555 book ko..hehehe..dami rin circuit dito..


Front Cover:




Back Cover:

[paranz]

^ uy ayus yan..

baka naman pwede mo i-post yung mga scanned pages hehe 

[underprezzure]

^ uy ayus yan..

baka naman pwede mo i-post yung mga scanned pages hehe 

Check your PM, i have almost the same type of ebook for you. Enjoy!

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[paranz]

great.. thanx a lot 

[Cute_Worm_1983]

pa PM din sis underpazz thanks!