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Use CD4060 with a crystal that is binary multiple of 1000HZ. The CD4060 has oscillator and ripple counter that can divide the crystal frequency by 2^n.
Alternately, you can use a small microcontroller like PIC12C508 or Z86E0208 or AT89C1051 to generate a 1KHz signal.
1.) You could try a NE555 timer IC. Requires a cap, and a couple of resistors to generate virtually any frequency you want. And this chip is cheap. I searched google for it, pictures:
I have never used spice (I really am behind with the whole 'software' thing) but those aren't the only chips you can use. There are many 'schmitt trigger' devices, some inverters, some nands. And I find it hard to believe any electronics simulation software is without some generic 'logic gates'.
Use google, or, if you're really stuck, you could 'build' a logic gate with discrete parts. Like MOSFETS, diodes, resistors etc... I'm sure google will have some examples.
Of course, you don't always have to simulate your designs, I'm sure the above circuit will work straight away, it did for me.
i agree with bcode about the use of a 555 timer chip ive personally used it many times just get the values close for your freq and a trimmer to fine adjust it
the best way is use IC555 times as monostable multivibrator circuit..
That gives you better result search in google for circuit.. its simpleand efficient... in general mostof circuits use this as pulse or clock generators for low speed desing less that 50 MHz.
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