I have a programmable thermostat with adjustment switches that apparently
bounce quite a bit, causing lockup of the system whenever you attempt to
adjust it. Any ideas on how I could rectify this situation? Would hooking
a small capacitor across the switch help anything, or is that likely a bad
idea?

Any help would be appreciated...

Thanks,

Dave


A small cap across the input and a 300 ohm resistor

Dave wrote:
I have a programmable thermostat with adjustment switches that apparently
bounce quite a bit, causing lockup of the system whenever you attempt to
adjust it. Any ideas on how I could rectify this situation? Would
hooking a small capacitor across the switch help anything, or is that
likely a bad idea?

Any help would be appreciated...

Thanks,

Dave


A small cap across the input and a 300 ohm resistor
in series with the switch. Primitive,but often it
works
try a cap in the range of 2 nf to 100 nf.

I have a programmable thermostat with adjustment switches that apparently
bounce quite a bit, causing lockup of the system whenever you attempt to
adjust it. Any ideas on how I could rectify this situation? Would
hooking a small capacitor across the switch help anything, or is that
likely a bad idea?

"Dave" <db5151@hotmail.com> wrote in message
news:12q7pm5rnrhdf71@corp.supernews.com...

I have a programmable thermostat with adjustment switches that apparently
bounce quite a bit, causing lockup of the system whenever you attempt to
adjust it. Any ideas on how I could rectify this situation? Would
hooking a small capacitor across the switch help anything, or is that
likely a bad idea?

What is it controlling?

What is it controlling?

It's the thermostat for my central heat and A/C. Believe it has something
like +9V or +12V going to it, with a low current availablilty.

"Dave" <db5151@hotmail.com> wrote in message
news:12qaoptdqeud02c@corp.supernews.com...

What is it controlling?

It's the thermostat for my central heat and A/C. Believe it has
something like +9V or +12V going to it, with a low current availablilty.

You could try to strip and clean the contacts but at this point a new one
might be easier and cheaper.


It's done this since day one, and it was not "cheap." Cheaply made maybe.

It's done this since day one, and it was not "cheap." Cheaply made maybe.
Or poorly designed...

"Dave" <db5151@hotmail.com> wrote in message
news:12qdc5rtjm07381@corp.supernews.com...

It's done this since day one, and it was not "cheap." Cheaply made
maybe. Or poorly designed...

What you describe is a very bad sign. Even the worst contact bounce should
be handled fine by a device like this. It isn't made by Lucas, is it?

I don't know about Lucas, but it says "Ritetemp" on the upper right side
of the main body, over the battery compartment. Why is it a bad sign?
And why a "very" bad sign? The worst it has ever done was not turn off
the heat as soon as it reached its set level. Please tell me what you are
thinking. This is my house... I would hate for it to become a blown fuse.

"Dave" <db5151@hotmail.com> wrote in message
news:12qgsueblsqgq5d@corp.supernews.com...

I don't know about Lucas, but it says "Ritetemp" on the upper right side
of the main body, over the battery compartment. Why is it a bad sign?
And why a "very" bad sign? The worst it has ever done was not turn off
the heat as soon as it reached its set level. Please tell me what you
are thinking. This is my house... I would hate for it to become a blown
fuse.

You said it 'locks up' when the buttons are pushed. This is a bad sign.
It's like having a car that needs a 2 minute wait every time you change
gears - you know it isn't right.

I doubt it will become a fuse but I suspect it will only get worse over
time.

Re Lucas - you should search for Lucas jokes.


The Lucas motto: "Get home before dark."
Lucas denies having invented darkness. But they still claim "sudden,
unexpected darkness"
Lucas--inventor of the first intermittent wiper.
Lucas--inventor of the self-dimming headlamp.
The three-position Lucas switch--DIM, FLICKER and OFF.
The other three switch settings--SMOKE, SMOLDER and IGNITE.
Lucas dip-switch positions: LOW and BLOW

Ah, okay. Well, we've had this for four or five years I think, and it
hasn't gotten any worse. It just seems to get confused whenever you try
to adjust it for higher or lower temp. I figured that was bouncing
switches. When I saw someone else discussing debouncing a switch, it
occured to me that I might be able to fix it.

"Dave" <db5151@hotmail.com> wrote in message
news:12qh2qonf3a5545@corp.supernews.com...

Ah, okay. Well, we've had this for four or five years I think, and it
hasn't gotten any worse. It just seems to get confused whenever you try
to adjust it for higher or lower temp. I figured that was bouncing
switches. When I saw someone else discussing debouncing a switch, it
occured to me that I might be able to fix it.

My guess is no. In the US these are quite cheap and I'd replace it with a
better model.