I'm wondering what I would need to get something that is 1.4vdc up to 12vdc to energize a coil in a relay and what type of relay. It would be really helpful is someone would draw what I would need to do and what model of transistor, relay and diode I would need

Thanks in advance

 

You could try an astable multivibrator feeding an inductor. The astable multivibrator using transistors will operate at 1.4 volts, but not so sure you'd get 12 at the output. I built an LED pen torch years back that used this schema turn one AA cell battery of 1.5 volts into about 4 volts to drive an white led.

Your better bet would to be to use something a bit more intergrated, specific and modern, such as an DC to DC inverter. This would be an single chip, an inductor, a handful of other passive parts hanging off the chip and not much else.

Easy greasy all the best with it...

 

Could you use a transistor instead oa relay to switch your load? Or does it need to be isolated?

 

Are you saying that you have 1.4VDC control signal and would like to energize a 12VDC relay?

You can do that with an NPN transistor such as 2N3904. But you will need a 12VDC supply.
You would put a 1kΩ resistor from the signal to the base of the transistor.
Emitter goes to ground. The relay goes between the 12VDC supply and the collector of the transistor.
The diode is 1N4001-1N4007 series. Any one will do.

 

So

Are you saying that you have 1.4VDC control signal and would like to energize a 12VDC relay?

You can do that with an NPN transistor such as 2N3904. But you will need a 12VDC supply.
You would put a 1kΩ resistor from the signal to the base of the transistor.
Emitter goes to ground. The relay goes between the 12VDC supply and the collector of the transistor.
The diode is 1N4001-1N4007 series. Any one will do.

sorry if this is a dumb question but why would I need a resistor on the 1.4 volt wire don't resistors make the voltage even lower?

 

The base-to-emitter junction of a transistor looks almost like a dead short to whatever is sourcing the 1.4VDC.
The transistor only needs about 0.7V to turn on. You want to limit the amount of current drawn from the 1.4VDC source to protect it from being destroyed.

With a 1.4V source, the 1kΩ value might be too high. You can reduce it to 220Ω.

 

Do you have 12 volts available in your project? If not, there are off the shelf cheap integrated circuits that will kick 1.5 volts up to 12- you'll only need a few components to make it work. You can also buy cheap (ie- a buck or two) modules on ebay & such that will do the trick. Share some info about what you're doing & it'll be a lot easier to get you a circuit

 

Do you have 12 volts available in your project? If not, there are off the shelf cheap integrated circuits that will kick 1.5 volts up to 12- you'll only need a few components to make it work. You can also buy cheap (ie- a buck or two) modules on ebay & such that will do the trick. Share some info about what you're doing & it'll be a lot easier to get you a circuit

Yeah I have 12volts available im trying to get it so that my 1 volt constant power when turn signal is on will turn off a 12volt power aka daytime running lights so you will be able to see my turn signal flashing when in use and when not in use the daytime will will come back on

 

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Here is a site that may provide you with some assistance: Electro Tech Online

Good luck.