On Tue, Dec 17, 2013, at 11:26 AM, Peter Johansson wrote:
> On Tue, Dec 17, 2013 at 11:39 AM, Bob Blick <bobblick@ftml.net> wrote:
>=20
> > Feel free to substitute any NPN transistor.
>=20
> Is the transistor used just to invert the waveform?

Yes, since the 555 naturally generates high-duty cycles it's the easiest
way to get short positive pulses.

Cheerful regards, Bob

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