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There is a couple of methods that could be used.
A pulse width modulator is very efficient and generates little heat when operating.
A voltage regulator works flawlessly all the way from max light to no light at all, it does however create a lot of heat and will most likely need some cooling.
As there is no ability for images here, I can not upload scematics for these two varieties.
If you however send me an e-mail, found on my profile, then I will send you scematics for how to make both varieties.
The key component in order to easily make both a voltage regulator and a pulse width regulator is two OpAmp's. These normally come in packages of 2 or 4.
Pulse-Width:
Use one OpAmp in order to charge and discharge a capacitor between approx 3 and 9 volt. The ideal choice of capacitor would be one without an electrolyte. You can however use an electrolyte capacitor for experimenting.
The other OpAmp is to be used to compare the charge of the capacitor with a variable resistors output. Output of this OpAmp should go to a PowerMosFet so that the MosFet turns power on and of according to the variable resistor.
Using a small value for the capacitor would give you a fast switch frequency, but it is a good idea to start with a largish value so that you can actually see what is happening.
You will of course need some resistors too! This above text just to give you an idea of how.
Voltage-regulator:
You need:
1 variable resistor.
1 OpAmp.
1 resistor of 560-1200 Ohm.
1 PNP Darlington.
Same basic idea with an OpAmp but instead of a PowerMosFet I would use a PNP Darlington Transistor. The Variable resistor of 10Kohm to 200Kohm (value does not matter much as long as it is not too low)
Connect one input of variable resistor to minus or GND.
Connect other input of variable resistor to +12 v.
Connect Output of variable resistor to + leg of the OpAmp (Not + as in Vcc input)
Connect resistor of 560-1200 ohm to output of the OpAmp.
Connect other end of this resistor to B leg on Darlington.
Connect E leg on Darlington to +12v
Connect C leg on Darlington both to - leg of the OpAmp and one leg of the lamp you want dimmed.
Connect other lamp leg to minus or GND.
As you turn the variable resistor clockwise (Towards +12V), the voltage will rise on the output of Darlington transistor. The lamp will become brighter.
You will of course need to connect an heat sink to the Darlington transistor or else it will become too hot and burn really fast.
This is the simplest way possible to quickly make a dimmer for low voltages. It does not really matter if the lamp and battery is 6 Volt or 12 volt or 24 volt.
The problem is that the voltage not used by the lamp will make heat in the transistor.
What else can I help you with?
Can you use a 12 volt dimmer switch for a 240 volt ceiling rose?
No, the voltage rating of the switch is too low.
Can you put an AC dimmer switch on a low voltage 12 volt halogen light fixture?
Although a dimmer can be designed for 12 v halogen lamps it is more common for dimmers to work on higher voltages. Dimmers have to work into a resistive load so it is not usually possible to place the dimmer on the high-voltage side of the 12 v transformer that comes with the lights.
When did Chevrolet switch from 6 volt to 12 volt?
1954-1955
What year did Chrysler switch from 6 volt to 12 volt?
1956
I have a fan in my car and I'd like to control the speed with a rheostat switch. Is there such a gadget for a car that operates off a 12 volt car line?
Any light dimmer switch fomr in your house should work fine. The trouble would be how to mount it in the vehicle.
When you charge two 6 volt batteries in series is the charger switched to 6 or 12 volt position?
Two six volt batteries in series makes 12 volts so switch the charger to the 12 volt position.
How do you connect several 12 volt batteries to make 24 volt?
you only need two 12 volt batteries to make 24 volt. connect them in series
Why do i still have 12 volt when i use disconnect switch in my RV?
The RV has a 12 Volt DC power supply that operates all the 12 Volt DC items in your RV when your plugged in to 110 V AC.
What year did vw switch to 12v?
1967 first year for 12 volt
Can 6 12 volt be wire to make 1 24 volt battery?
can 6 ,12 volt battery be wire to make in to one 24 volt battery for solar use in home
Can a 12 volt light be run on a 120 vac timer switch?
No and yes. A 120-volt plug-in timer connects the line voltage to the timer and to the switch that is operated by the timer, so you can't use it directly for a 12-volt light.However, if you use the timer to supply power to a step-down transformer, you can run a 12-volt light off the transformer (that's how most low-voltage landscape lighting timers work). If you don't need much current, you could even plug a 12-volt AC adapter "wall wart" into the timer. Otherwise, you would have to open the timer and modify it so that the micro switch is completely isolated from the 120-volt supply and bring it out to connectors for a 12-volt supply. Make sure you know what you're doing and also don't exceed the current capacity of the switch.
Where is the turn signal 12 volt flasher on t 800 kenworth?
In the switch itself...
