Thread: Momentary Startup/Shutdown Controller

I dont know how much you know about electronics but you can design one using a D-type flip-flop wired up for your needs. A typical D-type is the TTL 74LS74, theres 2 in a package, +5V supply.

The input is the "CLK" connected to your momentary switch. The output "not Q" is fed back to input "D". You can take any output "Q" or "not Q". The output changes when a transition is made from Low-High from your switch. Wire up your switch with a pull-down resistor such as it provide a "high" when pressed. You also need to clean the spikes from the switch by adding a debouncer, just a small capacitor.

Thats it, hope that helps

http://aaroncake.net/circuits/touch.htm ?

Yup, CMOS can take 15 Volts. Just be careful with them they can get damaged easily by statics.

http://www.fairchildsemi.com/ds/CD/CD4011BC.pdf

You need to modify the input so that it take "voltage" rather than "touch"

I dont think thats the circuit you are looking for. What it does is provide a "pulse" for a second when the pads are touched, it doesnt stay "Low" or stay "High". From what you said you needed a "toggle" type switch triggered by a momentary push button switch.

http://www.doctronics.co.uk/4013.htm

Thats a CMOS version of the D type flip-flop. As on my post #2, I mentioned how it can be connected as a toggle flip-flop. Just connect your debounced switch at the "CLK". S and R can be tied to 0V.