Re: Please suggest a time delay toggle switch



mingyan_chow@xxxxxxxxxxxx wrote: 
Hi Ed, Thanks again for your information. The 5 seconds switch works
very well. I can make use of it to work on other circuit.
Certainly, your 4017 works in my application. May I ask what is the
different between a toggle FF like 4013, 7474..etc in camparision with
the 4017 decade counter ? In consideration of reliability, durability,
stability ..etc. which one would you choose? I think I am going to test
all different suggestion to see the result.


and...

Actually, my turntable only palys 33. I want to add another  oscillator
make it plays 45 as well. There is only one button on the panel.
Therefore, I want to press the button to turn on the 33 , then press
the same button a little bit longer to toggle to another oscillators. I
can use the FF output Q and "Not Q"  to  toggle from either
oscillators. Of course when you press the button again, it turn off the
turntable.


That is not the same as your original:

I need a CMOS 4XXX toggle switch it's flip flop output is either high
or low while powered on doesn't matter. But if you press the buttom for
5 seconds, it automatically change state and retains at that state even
when you release the buttom until you powered off.

With one button, you don't want it to work like that. You use the single button to make one of three state selections: 33, 45, or OFF, and the circuit activates the setting something like 3-5 seconds after last button *release*- and NOT when the selection is actually made with the button press.

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