Hi!
Here's one for the 555 guys...I need to set up a bouncefree switch for a model train application. Need to fire a snap switch off, and mechanical switching leaves too much a risk of burning out the coil. The device only requires a voltage pulse for a brief time to work. So, I can use a 555 as a one-shot that goes H for 1/8 second or so, and uses a power transistor or relay as the switching device. No problem there.
The question: How can I 'block' the 555 from resetting for a couple of seconds after each timing cycle? This is to prevent repeated button-pushing, which would also damage the snap switch. I've thought of something in the reset line, maybe RC, to delay the reset, but don't quite know how it should be set up. If I can 'lock out' another button press for a few seconds, this project will be done. Thanks!
Here's one for the 555 guys...I need to set up a bouncefree switch for a model train application. Need to fire a snap switch off, and mechanical switching leaves too much a risk of burning out the coil. The device only requires a voltage pulse for a brief time to work. So, I can use a 555 as a one-shot that goes H for 1/8 second or so, and uses a power transistor or relay as the switching device. No problem there.
The question: How can I 'block' the 555 from resetting for a couple of seconds after each timing cycle? This is to prevent repeated button-pushing, which would also damage the snap switch. I've thought of something in the reset line, maybe RC, to delay the reset, but don't quite know how it should be set up. If I can 'lock out' another button press for a few seconds, this project will be done. Thanks!