pulsed to steady output
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=120996
Printed Date: August 20, 2025 at 11:34 PM
Topic: pulsed to steady output
Posted By: biggg72
Subject: pulsed to steady output
Date Posted: March 26, 2010 at 8:58 PM
i am using this diagram to hook up some lights to use them as intersection lights. i am confused about the coil i see on the +12v turn signal, does it belong there or no? the ground that comes off the capcitor and resistor, does this goto the body or the ground for the added light? the same with the 2nd ground coming off 85. i read another thread where it said using a 47uf would only give about 2 seconds, is this true, as i read elsewhere that a 10uf would give 2 seconds? can the ground of the res. and cap. be twisted together or do they have to have a sepereate contact point on the ground wire? i am asking alot of questions as this is new to me and im still learning this. thank for any help. 
Replies:
Posted By: biggg72
Date Posted: March 26, 2010 at 8:59 PM
it said put my year, make, and model of my vehicle. one is a 95 legend, and im thinking of putting this on my 98 expedition and my wifes 07 camry.
Posted By: i am an idiot
Date Posted: March 26, 2010 at 10:29 PM
Yes the 12 volt feed from the blinker needs to be there. That is what tells the device to turn on. The pulses from the blinker charges the capacitor and it keeps the relay energized while the blinker lamp is off. Then the next pulse comes around and charges the cap again. Ground is ground it does not matter where you ground terminal 85, if you ground it to the lamp, you must also ground the lamp to the chassis of the car too. The capacitor in this diagram is a 10,000 microfarad capacitor. Notice the K in 10K uf Ground is ground, it does not matter if you twist the cap and resistor together and ground both together, or ground each one separately, it does not matter. What are intersetion lights?
Posted By: biggg72
Date Posted: March 26, 2010 at 11:53 PM
i got that. is that a coil on the wire before the cap? i went radio shack today and all the caps said the number and uf, the store rep said they were all k's, is this incorrect? do the cap and the res. have to match in number? a intersection light is the light in the bumper that lights steady when you turn on your turn signal to light the turn, as in the pic. 
Posted By: oldspark
Date Posted: March 27, 2010 at 12:50 AM
Though the pic tells me nothing, would I be held liable if someone driving perpendicularly past me with their indicator on flashed me with some form of spotlight? (The liability resulting from my perceived reaction.)
The 10K's in the diagram are merely coincidence. They can be varied to change the time delay. The same delay will occur for any combination that equals the same RC (eg R x C = 10k x 10 k u = 100), but the circuit may not like capacitor that are too big or resistors that are too small.
If ks are a problem, ask for a 10,000uF cap and a 10,000 Ohm resistor.
I don't know what you mean by coil on the wire before the cap.
Electrically the relay's coil (#85 to #86) and its diode (also between #85 & #86) and the capacitor and resistor are all the same.
They are all connected with one side to the pink wire (to the RHS of that input diode) and their other side to GND.
It doesn't matter if it's C,R, coil, diode, or R, coil, diode, C - they are all the same connection electrically (assuming good connections between them!).
[ I though I'd give Ima some time off....]
Posted By: biggg72
Date Posted: March 27, 2010 at 12:56 AM
cool, i understand that. f.y.i., the lights are not a spotlight, although you could alter it. if you also notice it is towards the bottom of the bumper cover with a slight downward angle. i do however understand your point, but there are no worries there. there are others right now that are stock, like Q from infiniti.
Posted By: i am an idiot
Date Posted: March 27, 2010 at 5:08 AM
The device to the left of the capacitor is a diode. 1N4001 or any number between there and 1N4007. Radio Shack should have one. Tell the rep you need a 1 amp diode.
Posted By: biggg72
Date Posted: March 27, 2010 at 10:05 AM
ah thanks. 2 more questions, will a 1 amp diode cover any size res. and cap. i use? all they had was a 60a relay is that excessive, can i go with something smaller?
Posted By: i am an idiot
Date Posted: April 02, 2010 at 8:45 PM
I have no idea how much current the 60 amp relay will draw. A 1 amp diode will handle a standard Bosch/Now Tyco relay and pretty mucn any smaller capacitor. If you are concerned, Radio Shack sells a 3 amp diode.
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