Effective 12v double pole double throw relay for High-Risk Applications
Reliable 12v double pole double throw relay Styles for Industrial and Industrial Applications
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12V 5 Prong Relays with 5 Prong Sockets - You get 5 relays + 5 socket wires
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Khaled asked What diode should I use that doesn't drop power?
Hi I installed alarm system on my car, I connected wires so that when I hit lock/unlock , both parking and signal light flashs and horn beep. I had to install diode between signal and parking light so when I turn parking light on, singal won't trun on. The problem is, with diode installed, the power I'm getting is almost 11.5~ or less not 12v, which is not enough to flash all the light, I get one of the sides flash but not the other, if I remove the horn beep, they all flash. I need a diod that doesn't drop power much, I bought the N4001 and N4007 they drop power to 5v. I have the SR5001 5A 100v which drop power to 11.5~v So what should I use ? The alarm system only have one wire of power for 2 signals, seprated to 2 wires by diode, that diode doesn't drop power, I get strong 12v, too bad I can't figure which type of diode it is , it's all black -_- [[[ In Short ]]] I need diode that doesn't drop power below 12v. Thanks. @Griz806A Thanks mate , you were right, I was mistaken with the other diode, the N4001 gave me same results as the SR5001. To be honest with you, I know nothing about diodes power rating, it was recommended to me by electrican. I can't figure how power rating works. I don't know what type of diode the alarm system has, but it giving me strong constant 12v reading. Unlike the diode I'm using, gives me weak 12v droping to 11~. I made a diagram of my car and wiring. Please take a look at it, the wires with arrows are made by me. Also the beep device only make a beep not siren. http://s11.postimg.org/otm0jg1dv/IMG2.jpg Thanks. _______________________ @ Sullivan Yea if possible. So if the revrese voltage is low, does it mean it can forward more ? The N4001 says it has 50v reverese, the N4007 has 1000v, so which one can forward more ? Also can you tell me the name/type of the relay ? I have SR5100 5A 100V SCHOTTKY BARRIER, do you mean those ? Sorry looks like I misstyped it 5001. It gives 11v~. If I use +12v diode , for eg 14v diode , will it be able to forward up to 12v ? Just guessing. Sorry if I'm not getting this right. Thanks, that was realy helpful! I will leave the question open for few days, someone might bright us with another ideas. As for now, I will buy the SR540 and try them out. Thank you very much.
And got the following answer:
All diodes drop voltage, not power. Usual Vf for a typical rectification diode is about 0.7 volts. As you are seeing. There is a type of diode specifically made for low forward voltage drop. It's called a Schottky diode. Problem is that they are typically limited in the amount of current they'll handle. A 1N5822 has a typical Vf of less than half a volt. Reverse voltage is 40V. However they can only handle 3 amps. This is not enough to light very many car bulbs (assuming you haven't switched to LEDs). You could do what you want with relays... Do you REALLY have to flash all of the lights? edit - added: > So if the revrese voltage is low, does it mean it can forward more ? No. The reverse voltage is the voltage the diode can successfully block. Beyond that it will "break down" and conduct current in the opposite direction. I suggested the higher voltage Schottky because "spikes" in a car can easily exceed 40 volts. > The N4001 says it has 50v reverese, the N4007 has 1000v, so which one can forward more ? What you want to know is "which has the lower forward voltage drop." That's a separate spec. it is not much related to reverse breakdown voltage. btw, diodes do not "forward" voltage. They pass current, and they cause a voltage drop. > Also can you tell me the name/type of the relay ? Thinking about it, you'd want one at each corner of the car. I don't think it would be practical. But... you'd want double pole , double throw relays with 12 volt coils and contacts that can handle 20 amps. On each relay, you put the normally closed contacts in series with the lines to the nearby parking and turn signal lamps, with the moving contact going to the lamps and the stationary NC contacts to where they normally go in the car. The output from the alarm would operate the coil, and you would run battery 12 volts to both stationary normally open contacts. This way, when the alarm signal appears, the relay coil pulls in, the lamps are disconnected from their normal circuits, and are supplied with 12 volts. > I have SR5100 5A 100V SCHOTTKY BARRIER, do you mean those ? > Sorry looks like I misstyped it 5001. It gives 11v~. Yes, the 5100 is a Schottky. However the data sheet shows it has a forward voltage drop (Vf) of 0.85 volts. You might try the SR540, with a Vf of only 0.55 and a reverse voltage rating of 28 volts... which is probably enough. But all of these are only rated at 5 amps. If you're running all your parking lamps and all your turn signal lamps through this, you're pulling a lot more than 5 amps. And so the diode's Vf will increase. In all diodes the forward voltage drop increases as current increases. > If I use +12v diode , for eg 14v diode , will it be able to forward up to 12v ? Just guessing. > Sorry if I'm not getting this right. No, the reverse voltage rating doesn't limit the voltage you'll get after forward voltage drop happens.
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