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555 Timer based Circuits

• Pulse width modulation using 555.
• Fixed frequency variable duty cycle 555.
• 555 watchdog for uC and uP systems.
• OR gate with two 555.
• Drive SCR thyristor with 555.
• LM555 Voltage Doubler.
• 555 based Reset Generator.
• Astable Oscillators with 555.
• 555 Circuits and Ideas
  

The Incredible 555 :

These are some 555 circuits, The most versatile and simple chip of all time !.

Some of my 555 Circuits are at my blog - 555-Circuits - delabs Schematics

The best part of the 555 is that it has an voltage detection. It has a Versatile Logic which is defined by voltage comparators. The ability to loop it like an opamp for feedback makes it the first "Programmable" Mixed Chip. In short it make an ideal building block.

555 The most Incredible Chip - At my Learning-Teaching Blog Solderman Basics.

Signetics made the 555, This is one IC that is like a E-LEGO, this along with Op-Amps and other components can make many interesting projects. On some pins like Control Voltage it responds to analog signals and on Reset and Output the signals are Digital like. The 7555 a CMOS version consumes lower power and oscillates at higher frequencies.

555 Astable and Monostable Formulas from an Application note of the first 555 by Signetics. The chip on this page is one of the first 555 types.



Its drive is amazing, it can power small solenoids, lamps and relays. It is a Symmetrical output drive, means Source - push the pectrons into a node and Sink - pull the pectrons from a node. Conventional current is opposite to the flow of electrons.  Current flows from positive to negative, so let  me use a new word pectron, imaginary '+' electrons, not Positrons.

Monostable and Astable Formulae from Signetics the Inventors of the 555

Tutor Gadgets for 555

• Astable 555 Timer
  
• LED Running lights

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This evergreen or perennial chip is the favorite among students and hobbyists who want to learn electronics. Here is a PDF Image Collection i made from the first datasheet from Signetics and others, it has very nice illustrations which will act as an appetizer for learning this science.

Switching Step-Down Power Supply

An Astable clock triggers a Monoshot. The pulse width of oneshot is modulated by a feedback of the filtered supply at pin 5. PWM of oneshot is filtered for output. - Signetics NE555 Application Note.

NE555 Applications and Specifications

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"Study .. Learn .. Examine.. Experiment .. Analyze .. Establish .. Realize"

- Solderman    1658