hello every body,

i have a project to make a function generator using 555 timer

i'am using the 555 timer as astable multivibrator to produce a square waves then passing it to an integrator to convert it to triangle wave then i used another integrator to produce a sine wave ,,,

the function generator must oscillates at 1 Hz - 1 MHz
in low frequencies it is simple to produce the integrator output

my problem now is at high frequencies such 1MHz how to integrate!!!

any ideas ???? i want to do it as fast as i can

thanx everybody

 

Usea crystal as a clock source for a counter circuit, use the outputs of the counter through an op amp integrator/buffer and another to set output impedance to 50Ω.

 

where is the 555 timer??!!

 

You might look up "Miller integrator". It can be made with one or more transistors which should be fast enough for your requirements.

Edit: The problem with an integrator is that its output amplitude is inversely proportional to frequency. How will you deal with that?

It would be much easier if you could use a function generator chip such as the XR2206 which generates square, sine, ramp, and triangular waveforms.

 

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