help with schematic

enzo_e492901 · 27th April 2006, 01:35 PM

I have this half completed schematic. on the right i have a switch with a debounce circuit and on the left i have a push on push off circuit using a 555 timer to drive a relay. i am aware that the output from the swith debouncer will be a pulse and that the switch on the 555 circuit is used in a different way. there for i have no idea how to connect the 2 togeather. can anyone help me?

i dont know if i can post images here so if someone would like to help ill e-mail them the schematic.

many thanks

gavin

I_Forgot · 27th April 2006, 02:26 PM

I'm not exactly sure what you're trying to accomplish, but the article here tells how to use a 555 as a relay driver.

Your logic circuit looks like a button debouncer, but there is no "memory" in your circuit, so if you're trying to make a push on/push off control for the relay I think you need to make some changes.

I_F

BobEllis · 27th April 2006, 02:36 PM

you want a flip-flop between the debounced switch pulse and the 555. You can buy an IC or make your own with few parts.

enzo_e492901 · 28th April 2006, 10:14 AM

The lefthand push on/off circuit (soft switch or whaterer) with the 555 works i have both beradboarded it and etched a pcb. The 555 circuit is from elektor electronics. after i built the pcb i noticed it suffered from bounce which brings me to where i am now.

thanks for the info

gavin

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27th April 2006, 02:26 PM	#2
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	I'm not exactly sure what you're trying to accomplish, but the article here tells how to use a 555 as a relay driver. Your logic circuit looks like a button debouncer, but there is no "memory" in your circuit, so if you're trying to make a push on/push off control for the relay I think you need to make some changes. I_F

27th April 2006, 02:36 PM	#3
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	you want a flip-flop between the debounced switch pulse and the 555. You can buy an IC or make your own with few parts.

28th April 2006, 10:14 AM	#4
enzo_e492901 diyAudio Member Join Date: Apr 2006 Location: east mids	The lefthand push on/off circuit (soft switch or whaterer) with the 555 works i have both beradboarded it and etched a pcb. The 555 circuit is from elektor electronics. after i built the pcb i noticed it suffered from bounce which brings me to where i am now. thanks for the info gavin

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