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Need help designing a simple circuit board

U

UpGrD

Golden Member
I need a small circuit board design (the smaller the better). The board will be for powering on several LED's.
I'll be using a max of 12v dc. I know what I need for the LED's but its the actual switch that I'm having trouble with. I want to use a simple surface mount switch like this
This is a momentary switch, I'll need other components to make that work.
Push on push off is what I need. What electronic components function in that way, some kind of relay??? Any advice/help would be great.

Thanks...........
 
They sell the kind of switches you want. You can get the kind you have to hold in, or you can get ones which click on and click off. Don't force yourself into designing a more complicated circuit around the wrong part when you can just buy the right part.
 
You cannot get the push on push off switches in the size I need. The mechanical push on push off switches you speak of are way too big for my application. I must use the type of switch I linked to. It is also very important that the "feel" of the switch be similar to the feel of the switch I linked to. Much like the feel of the eject switch used on most cdrom?s.
 
how about a flip flop? the push button could make it change....of course you'd probably need to debounce the switch...

 
Originally posted by: UpGrD
You cannot get the push on push off switches in the size I need. The mechanical push on push off switches you speak of are way too big for my application. I must use the type of switch I linked to. It is also very important that the "feel" of the switch be similar to the feel of the switch I linked to. Much like the feel of the eject switch used on most cdrom?s.
Click to expand...

Mouser.com

Or use the switch you linked to. An SPST will turn LED's on and off. The one you linked to says nothing about being momentary.
 
Originally posted by: AlienCraft
Originally posted by: UpGrD
You cannot get the push on push off switches in the size I need. The mechanical push on push off switches you speak of are way too big for my application. I must use the type of switch I linked to. It is also very important that the "feel" of the switch be similar to the feel of the switch I linked to. Much like the feel of the eject switch used on most cdrom?s.
Click to expand...

Mouser.com

Or use the switch you linked to. An SPST will turn LED's on and off. The one you linked to says nothing about being momentary.
Click to expand...

the one he linked to is momentary - usually used with a pullup resistor on a controller pin

as said before you can probably find a tiny press on/press off switch on mouser or digikey.com
 
yeah a relay would do it, or a small silicon chip that does the same thing - for turning it on at least, turning off I'm not sure on. I'm studying that right now in classes but we haven't gotten that far with one momentary button doing both
 
Thanks for the replies. I did find a Circuit Diagram here.
The following is the description accompnying the diagram.

Modern electronic equipment incorporate "push-to-on-push-to-off" switches that do not make the clicking noise as with old equipment. An example of this is the power button on a ATX computer cabinet. Here is a circuit that does the same. It can be used to turn on/off any electronic/electrical equipment that operates on any range of voltages.
When the "ON/OFF" button is pressed once, the equipment goes on and stays on. It goes off when the button is pressed again. The circuit is straight forward. It uses a JK CMOS FlipFlop to with its JK terminals tied high to achieve the toggling action. The clock is provided by the push button used for on/off action. The resistor and the capacitor near the on/off switch debounces the contacts.
Note that when the circuit is switched on, the relay may land in a on or off state. It can be brought to the off state by pressing the RESET button.
Care should be taken that the relay's current does not exceed 100mA.
Since the IC is CMOS, it can be operated from 3V to 15V, but in this circuit it is operated at 9V for a 9V relay. The relay circuit needs to be modified for other operating voltages.

Can anyone help by listing the components needed. I see the resistor's, relay and switches needed but am a little lost when it comes with the other components. SL100, 0.47 uF, IC CD4027.
 
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