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MIDIbit | littlebits MIDI interface Dangerous Prototypes | A new open source hardware project every month » Electrónica completa Robótica y Electrónica Three Fives - Discrete 555 Timer Kit Overview The "Three Fives" Discrete 555 Timer kit from Evil Mad Scientist Laboratories is a faithful and functional transistor-scale replica of the classic NE555 timer integrated circuit, one of the most classic, popular, and all-around useful chips of all time. The Three Fives kit was designed by Eric Schlaepfer, in collaboration with Evil Mad Scientist Laboratories. Download Datasheet (2.5 MB PDF file). Building the kit The Three Fives kit is sold as an easy-to-build soldering kit [?]. To build the Three Fives kit, basic electronic soldering skill and tools are required, but no additional knowledge of electronics is presumed or required. The kit features easy "through-hole" construction ("No surface-mount nothin' nowhere!") Using the "Three Fives" Discrete 555 Timer The Three Fives circuit is a direct implementation of the "equivalent circuit" from the NE555 datasheet, built up using resistors and individual 2N3904 and 2N3906 transistors. Additional specifications