Help with chips - Electronic Circuits Projects Diagrams Free

Jono14 · 13th February 2004, 09:46 PM

Can someone explain to me how to use a schmitt trigger to debounce a circuit. Also does anyone know the pin outs to the 4518B as i am making a decade counter using a seven segment display.

Russlk · 13th February 2004, 10:09 PM

I would not use a schmitt trigger for debounce, an R-C filter is easier. the pinout is below.

Jono14 · 13th February 2004, 10:24 PM

Thanks very much for the help. Your right an r-c filter switch will be better.

Roff · 14th February 2004, 12:33 AM

Russ, an RC filter is generally followed by a Schmitt trigger to give a fast risetime, as you undoubtedly know. What configuration do you have in mind?

laroche73 · 14th February 2004, 02:58 PM

here is a short article on using schmitt triggers for switch debouncing:
http://www.e-insite.net/ednmag/conte...ges/196470.pdf

k7elp60 · 15th February 2004, 02:55 AM

Thought I would my 2 cents worth. The reason that debouncing is necessary is that the mechanical contacts generally vibrate and cause more than just one closure or one brake of the circuit. The RC components and the one-shot MV eliminate the multiple mechanical bounces of the contacts, that most electronic circuits would normally respond to.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

13th February 2004, 09:46 PM	(permalink)
Jono14	Help with chips Can someone explain to me how to use a schmitt trigger to debounce a circuit. Also does anyone know the pin outs to the 4518B as i am making a decade counter using a seven segment display.

13th February 2004, 10:24 PM	(permalink)
Jono14	Help with chips Thanks very much for the help. Your right an r-c filter switch will be better.

14th February 2004, 12:33 AM	(permalink)
Roff	Russ, an RC filter is generally followed by a Schmitt trigger to give a fast risetime, as you undoubtedly know. What configuration do you have in mind?

14th February 2004, 02:58 PM	(permalink)
laroche73	switch debouncing here is a short article on using schmitt triggers for switch debouncing: http://www.e-insite.net/ednmag/conte...ges/196470.pdf

15th February 2004, 02:55 AM	(permalink)
k7elp60	contact debouncing Thought I would my 2 cents worth. The reason that debouncing is necessary is that the mechanical contacts generally vibrate and cause more than just one closure or one brake of the circuit. The RC components and the one-shot MV eliminate the multiple mechanical bounces of the contacts, that most electronic circuits would normally respond to. __________________ The great thing about electronics is unlimited ways to do the job. The only limit is one\'s imagination. I generally think my way is best. Show me a different way. I have an open mind.