Simple, cheap, square/triangle/sine-wave generator 2012-05-25

[alec_t]

alec_t submitted a new article:

Simple, cheap, Square/Triangle/Sine-wave generator - A test signal generator is invaluable when making or repairing electronic equipment. Although a ful

A test signal generator is invaluable when making or repairing electronic equipment. Although a fully-fledged, accurate (and expensive!) sig gen is desirable, there are many occasions when a simple, non-calibrated, highly portable signal source will suffice for a quick test such as signal tracing. To that end I've designed this circuit which selectively generates square, triangle and pseudo-sine waves in three frequency ranges covering 15Hz to 2MHz.
The core of the generator is a...

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[shortbus=]

alec_t , thank you for this circuit!. It will come in handy for a project I'm working on now. A question for you, will a single supply (rail to rail) op-amp work in this circuit? If so could you suggest one to use?

Again thank you.

 

[alec_t]

Almost any op-amp (single or dual supply) with a reasonable gain-bandwidth product should be ok, and supply voltage isn't critical provided the V+ to V- voltage difference is less than 15V (the max CD4093 operating voltage). Rail-to-rail operation is not really necessary because the op-amp inputs are biased around mid-rail voltage and the output voltage swing is only a volt or two. The circuit shown uses an LT1007, but LM324 etc should be fine (though I haven't checked its high frequency response. Good luck with the project.

 

[shortbus=]

Thank you for your answer. This will be my first time using an opamp so thats why the question.

 

[christianarmand]

Simple but effective!