electronics question.

[U_W v2.0]

i need an ignition activated electrical source on the bike, the thing is i need to take the voltage and current down to no more than 6v @ 750ma.

any ideas how to do this? i dont mind soldering up a small circuit to do the job but would rather an easy option ideally.

mucho thanko.
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[The Artist]

1. It's electrics, not electronics.

2. Just need a transformer like a laptop power supply but find something that uses 6v.

3. Wire it into the loom in the lights power supply pre switch.

[U_W v2.0]

fair enough, thanks artist. however, if i need a transformer it'd need to be small, i.e "chuck it in the headlamp bowl after coating in heatshrink" small.

would it be possible?
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[lihp]

just use a voltage divider.

google it if unsure. make sure the resistors you use can handle the power that you will be running

[U_W v2.0]

hum hum, alrighty, i'll google for that, pretty good and condensing circuit sizes hehe.

i dunno, all this for an effing warning light lol.
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[The Artist]

https://www.ebay.co.uk/itm/Waterproof-DC-DC-Converter-12V-Step-down-to-6V-3A-15W-Power-Supply-Module-/221118134791?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item337baafa07

[carvell]

[U_W v2.0]

[carvell]

[U_W v2.0]

[carvell]

What do you need the 6V supply for?

Why can't you just connect the LED to 12V, with an appropriate series resistor?
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Yamaha TDM 850

[U_W v2.0]

because the last time i wired leds directly to the 12v source with resistors the wire grew far to hot, so hoping to reduce the voltage and current pre led/switch wiring.

so purely saftey.
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[The Artist]

[carvell]

You did something wrong then I'm afraid!

An LED is not going to be pulling enough current to get anything hot.

You can connect an LED to 12V perfectly happily, you just need to choose the correct resistor value.
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Yamaha TDM 850

[P.]

Why don't you just start bike on choke, put jacket, lid and gloves on, ride to the end of the road and turn it off?

[carvell]

Or buy "12V LEDs", indeed. These have a built in resistor which allows you to connect the LED directly to a 12V battery.
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Yamaha TDM 850

[U_W v2.0]

i'll look into it, i know this specific wire is good for 1.25 amps as it the same wire i used in the voyager model on a 1.25amp psu.

these should be 12v resistors so it might actually be fine, i'll wire it into the brake light tomorow and check it out.

as for 12v leds, theres no such thing so to speak, the difference is when you buy 12v leds they are pre-wired leds with adequate resistors already in line.
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[U_W v2.0]

[U_W v2.0]

[kramdra]

well that was shit. so its just for a switch and couple of leds... use a resistor

and calculate it on 15v, not 12.

[carvell]

There's no such thing as a 12v resistor. What value is it? (in ohms)

The forward voltage of an LED is usually around 2.5V and the forward voltage is usually around 25mA.

Based on this, the resistor needs to be at least 380 ohms.
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Yamaha TDM 850

[U_W v2.0]

i know theres no such thing as a 12v resistor, i just meant they're suitable for most 12v sources.

also they are around the 500 mark.

blue resistors, colour bands:

yellow brown black? blue brown.
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[P.]

Up your idle.

[U_W v2.0]

bah, thats easy.

also, disregard those colors. they're wrong lol. color blind
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[Islander]

Just use a resistor. A standard LED on a 12V supply drawing, say 15mA would need a 680 ohm 0.25W resistor. 15mA should be an adequate forward current.

It won't get hot - you're looking at 0.15W or so.