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RE: 555 timer...

Original poster: "Breneman, Chris" <brenemanc@xxxxxxxxxxxxxx>

The 555 in itself is limited to about a 55% duty cycle and above. There's a nice schematic using a LM393 attached to the capacitor charging loop in a 555 bistable circuit to generate a duty cycle variable across nearly 0% - 100% on RMCybernetics. The link is http://www.rmcybernetics.com/projects/DIY_Devices/homemade_signal_generator2.htm



From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Sat 1/6/2007 7:20 PM
To: tesla@xxxxxxxxxx
Subject: 555 timer...

Original poster: "Chip Ford" <chipford@xxxxxxxxxxxxxx>

This is kinda off topic but, can someone please help me with this...I
am trying to get a 555 timer rectangle pulse (Basic Astable) to stay
low longer then it is high...Is this possible? I have achieved near
equal (square) but never longer low then it is high?? Thanks for any help.

Chip Ford