1kHz Signal generator ideas

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    triangles
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    I am looking for ideas to come up with something cheap to generate a 12V 1000Hz 20% duty cycle signal.  I have tried with a 555 timer but I would have to use potentiometers which I would like to avoid.  The trial circuit I built was only 918Hz with 22% duty cycle.  I’d like to be within +- 10 Hz but I should be ok with +- 2o Hz.  Ideally I’m trying to come up with something that I don’t need to fine tune with a scope and is cheap.

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