Someone told me it is possible to use two relays and a pushbutton to make a flipflop switch it is possible but i cant think of how to do it plz help ideas diagrams any that would help i need one for a case mod and do wont to use a flipflop ic
i am also interested in this. flip flop on the internet seems to locate alternating lighting... i have sen it somewhere before though...
All I know is that you would have to use relay logic (now where did I put those notes from electronics class?)
Alright, since I couldn't find my notes. Here is what I remember. You can build any of the basic gates out of relays, using NO (normally open) and NC (normally closed) relays. I can't remember which is which but I think this is correct. I hope that this is what you need (hopefully someone with more knowledge can confirm this. You make 2 nand gates out of 4 NC relays (2 NC relays per nand gate). Then you just make a flip flop out of them. I am not sure that this is how it is supposed to be, so feel free to try it out, but I can't promise it will work.
I was looking at this a couple weeks ago. Here's one of the circuits I was looking at. http://ourworld.compuserve.com/homepages/Bill_Bowden/page9.htm#4013.gif Single Transistor Relay Toggle Circuit
for the circuit i am after it would be useful if it could run off 12v and have the switch using ground (since teh button gives ground when toggled (it is part of a panel of buttons with common cathode..)
Here ya go, hope this clears things up. Could one of the resident electrical gurus check this? If this is corect, I will begin to write up a guide on relay logic. Sorry I couldn't figure out a way using only 2 relays.
I remember when I was in the Technology Student Association some one had made a working model elevator (for four flloors) that worked off of relays. was interesting to say the least.
You could try an alarm supply place...they call them "clutch Relay" not all that expensive, less than AU$10. I gather from your letter that you want the same button to both set and reset the relay? These clutch relays do exactly that.
That looks more like a latch and needs a SPDT switch - zero-cool wants a momentary-switch operated flip-flop like this which will take a few more relays.
Ah, my knowledge fails me I guess I am not worthy of writing up a guide... maybe another time after I have expanded my knowledge.
man all i want is to push a botton and it turns a red light on ande push that button again and it turns a blue light on i need to do it with a push button and relays i know its possible but i can't figure it out
Well this is as close as I could get, but you will need 2 pushbutton switches (one NO and one NC) and one relay. You press button A (NO) and output 2 goes high while output 1 goes low, then press button B (NC) and output 1 goes high, while output 2 goes low. That is the best I could come up with
Cou can do this with just transistors too, unless you need to switch something a little more heavy duty than a transistor can handle. Just lemme take a look see if I can find the schemmo.
I'm positive that you can't do that, at least not cleanly. There is some law of logic against it, but I can't remember its name. You will always need a time delay mechanism to implement a toggle flip-flop. Some ingenious circuit could use the drop-off time that a relay needs after the coil power is removed, but that depends on the switching characteristics of the relay. Some commercial relays with this function use ratcheting mechanisms as this article describes http://www.cougarelectronics.com/pdf/latching relays.pdf. There are also designs that use more relays than two to implement a squencer.
