Function generator
This project creates all kinds of signals at a user settable freqency.
Very useful in analog design and checking things.
This design is based on the application
note from maxim-IC. Loosly based on the sine wave generator example.
This device can create sine, square and triangle waves at 50% duty
cycle, the frequency can be varied from 10s of hertz to a few megahertz.
The whole is made on simple prototyping board with copper tape placed
around for a groundplane, the whole is housed in a metal casing
stripped from a IF amplifier from a old TV, these old TV's have lots of
useful RF shielded boxes and units to be recycled for your own
projects. Housing this project in a metal case is absolutely needed,
stray signals can be coupled from all kinds of sources.
The powersupplies are switching but properly shielded from the analogue
part with ferrite beads in the supply lines. The analog part is
decoupled as much as possible at various locations where power enters
the chip. Decoupling and proper shielding is VERY important, i cant
stress this enough. Previous generators i have built had jittery
outputs becouse of
the stray signals from various sources or the supplies. The use of
ferrites is an absolute must.
This is a picture of the generator itself top and bottom.
Sine at 1MHz.
Square at 1MHz.
Sawtooth at 1MHZ.
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Last update at: 17-06-2005