The Incredible and Versatile 555 : These are some 555 circuits, The most versatile and simple chip of all time !. Some 555 circuits with source in the Cadsoft Eagle format are also here for editing and learning.

555 Timer based Circuits

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.

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.

555 trigger mode cartoon

Tutor Gadgets for 555


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.

“Study .. Learn .. Examine.. Experiment .. Analyze .. Establish .. Realize”

– Solderman 1658

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