Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 28, 2008 11:02:22 GMT -8
I am looking a circuit that when a constant 12 volts is applied it will output a pulse to a 12 volt relay.... I am going to use it to pulse the Seat Heaters when my wife uses her remote start....
Thanks!
Glenn
|
|
rmeyn
Full Member
My primary interests are electronics, sailing, bowling, and camping
Posts: 163
|
Post by rmeyn on Oct 28, 2008 12:58:46 GMT -8
Is this circuit to work only when the remote start is used? What about normal starting?
What about summer when the seat heater isn't needed? It seems much information is needed before designing a circuit. Also, why the CONSTANT 12 volt?
rmeyn
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 29, 2008 10:25:43 GMT -8
It can be used all the time, I will install a bypass switch for summer usage... The constant 12 volts is from the car being turned on......to provide power to the circuit......Thanks......
|
|
rmeyn
Full Member
My primary interests are electronics, sailing, bowling, and camping
Posts: 163
|
Post by rmeyn on Oct 29, 2008 19:59:20 GMT -8
I'm fairly sure that you don't need a fancy circuit to do this. You need to find a power source that is only on when the engine is running. You would need to wire this source to an automotive SPST relay that switches the seat heating element on. You would need to consider the amperage needed for the heaters when choosing the wire guage and relay current carrying capacity. Also, you would need a fuse in case of accidental shorts. I would find a mechanic that is familiar with your vehicle to help with tying the power source to the ignition system. Hope this helps and good luck. Be sure to disconnect that battery before doing any wiring. And, a car battery rarely gives a constant 12 volts output. It varies a great deal. There is a certain amount of variability allowed with a 12 volt relay and heating element.
rmeyn
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 30, 2008 4:59:01 GMT -8
I had thought about that, but I thought it would be better to just tap into the momentary switch and not into the main circuit box under the hood. I kinda figured a debounce circuit but it is reversed of what I want to do.......Thanks....
|
|
rmeyn
Full Member
My primary interests are electronics, sailing, bowling, and camping
Posts: 163
|
Post by rmeyn on Oct 30, 2008 18:44:47 GMT -8
You know, the real low tech way to solve this problem is to simply plug the seat heater into a cigarette lighter socket that is on only when the ignitions switch is on. Just unplug when you don't want heat. No further fusing is necessary since the cigarette lighter is fused. Now if you want to employ a switch, then a self-latching relay circuit seems to be the answer. There are simple circuits available to do this that employ a relative few components. The circuit usually has a normally closed switch (momentary break) , a transistor, a biasing resistor, and a couple of diodes (one to prevent sparking as the relay de-energizes) and an automotive type relay. You can view such a schematic at: www.uoguelph.ca/~antoon/circ/relay8.htmlrmeyn |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 31, 2008 6:11:15 GMT -8
That sounds like it will do the trick.....I will check it out, Thanks! I forgot all about the latching relays!!! I used then all over my model trains for the switches and lights!!!! duh!!!
Thanks for kicking the brain back in gear!!!!
Glenn
|
|
|
|
Post by Gary Lecomte on Oct 31, 2008 6:28:11 GMT -8
That sounds like it will do the trick.....I will check it out, Thanks! I forgot all about the latching relays!!! I used then all over my model trains for the switches and lights!!!! duh!!! Thanks for kicking the brain back in gear!!!! Glenn An SCR can also be used as a Latching Relay. (NO actual Relay) Connect the Cathode to Battery Negative. Next, Connect the battery Positive to a Momentary Normally Closed Switch, to the Load and the other side of the load to the SCR's Anode. Applying a Momentary signal to the gate will trigger the SCR ON, and it will remain ON until the NC switch is opened. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Nov 3, 2008 11:31:24 GMT -8
PERFECT!!!!!!!!!!!!! Thank you Gary....that will do the trick.....
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 19, 2009 9:09:13 GMT -8
May I know the number of SCR to be used?
Thanks..
|
|
|
|
Post by Gary Lecomte on May 20, 2009 4:48:20 GMT -8
May I know the number of SCR to be used? Thanks.. ANY SCR Will do this. You just need one with a Suitable CURRENT RATING. But This ISN'T Suitable for your Starter. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 28, 2009 7:46:44 GMT -8
Thanks gary..
|
|
