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KITS & PROJECTS / EVIL MAD SCIENTIST / "THREE FIVES" DISCRETE 555 TIMER KIT
DESCRIPTION
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. The kit is lovingly designed to resemble an (overgrown) integrated circuit, based
around an extra-thick matte-finish printed circuit board. It comes complete with a tough and
sturdy plastic stand that gives the circuit board eight legs in the shape of DIP-packaged
integrated circuit pins.
Building the kit
The Three Fives kit is sold as an easy-to-build soldering kit [?]. It includes the circuit board,
resistors, and transistors that make up the electrical circuit as well as printed assembly
instructions. The kit also comes complete with the "IC Leg" stand, and 8 color coded
thumbscrew terminal posts.
To build the Three Fives kit, basic electronic soldering skill and tools are required, but no
additional knowledge of electronics is presumed or required. You provide standard soldering
tools: a soldering iron + solder and small ("flush") wire clippers, as well as a Phillips head
screwdriver.
1
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"Three Fives" Discrete
555 Timer Kit - v2.0
PRODUCT ID: 1526
33 IN STOCK
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DESCRIPTION
TECHNICAL DETAILS
The kit features easy "through-hole" construction ("No surface-mount nothin' nowhere!"), and
(assuming that you have prior soldering experience) should take roughly an hour to build.
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. It comes with
terminal posts and solder points so that you can actually connect to it and build up classic 555
timer and oscillator circuits. Using those terminal posts and solder points, you can hook up with
with bare wires, lugs, alligator clips, and/or solder joints-- however you see fit. And unlike the
chip version, you can even hook up probes to monitor what goes on
inside
the circuit.
There are a remarkably large number of excellent 555 example circuits available on the internet
(for example, over 100 here). In the photo to the right, you can see a simple 555 LED flasher
built up with the Three Fives kit.
TECHNICAL DETAILS
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