12 VOLT REGULATOR
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This is our new 12.0V voltage regulator
circuit built around the LM2940 Low Dropout Regulator
. It is designed to be used in situations where a supply voltage in excess of 12 Volts
could damage a device, but the voltage source (typically a lead acid battery) supplies in excess of 12V. This new design has dimensions of just 50 x 23 x 19mm
The regulator will output up to 0.7 Amps of 12.0 Volts DC
from a maximum input voltage of 16 Volts
with no need for additional heatsinking.
This regulator circuit is perfect for LED lighting
applications using 12V LED Spotlights
. These bulbs have a working voltage
of 10.5-13.5 Volts, so if they are directly connected to a 12V-rated lead acid battery
, the bulbs could easily be damaged by the 13.5V+ voltage of a fully charged or under-charge battery.
If a switch
is to be used - e.g. for lighting - it should be connected into the circuit before
the regulator so that the regulator does not draw any power from the battery except for when needed. Similarly if using a fuse
, it should be fitted into the positive line connecting the battery to the regulator and located close to the battery.
The 0.7 Amp
current limit on this regulator circuit corresponds to powering up to seven
1 Watt LED spotlight bulbs
. The onboard heatsinking
keeps the regulator cool under load with up to 4 to 5 of our* 1.5W spotlight bulbs when powered from a 12.5-16V (typical lead acid battery) source.
* Other bulbs may use more power and therefore current than labelled. If you have bulbs from another supplier we recommend you test their power consumption.
If you intend to use this regulator up to its absolute 1 Amp
limit or to regulate from a voltage of 16+ Volts, you must use a larger heatsink or fan. Contact us directly (email firstname.lastname@example.org
) before purchase with details of your exact requirements.
Using the 12 Volt Regulator
Connecting the 12V regulator
into a circuit is very easy, as shown in the images below:
* Should the input voltage falls below 12.5 Volts, the low dropout
regulator will 'drop
' a maximum of 0.5 Volts
- for example, an input of 12.3V will generate an output from 11.8V-12.0V depending on the current used by the load - 12.0V if the current is small, and 11.8V if the full 0.7 Amp
maximum current is being used.
NEW 12V Regulator with Fitted Fuse
Pictured above is a 12 Volt
regulator with a 1 Amp fuse
mounted securely to the circuit board. It makes connecting a system a lot easier and tidier than using a standard in-line fuse holder and fuse
. Click here for more information and/or to purchase this 12 Volt Regulator with Fuse
now with two spare 1A fuses for £6.29
Similarly we can also incorporate screw-in terminals for a switch
in order that the correct BATTERY to FUSE to SWITCH to LOAD connections can be made tidily on one board. This board is priced at £6.79
including two spare 1A rated fuses. Click here now to find out more and/or to purchase this 12 Volt Regulator with Fuse and Switch Terminals
Pictured below is our latest 12 Volt low dropout regulator
. This is designed for use where space is at a premium. The three types of standard regulators described above come in at around 85 x 60 x 30mm which is a bit large for some applications.
This new regulator is around 30 x 25 x 15mm
in size, and is entirely housed in super-hard and durable epoxy resin
. This electrically insulates the regulator and associated components and so no casing is required. The regulator is certainly very weather and splashproof, and should also be waterproof
(not that it is the sort of thing you would use underwater).
This regulator is only really suitable for loads of around 0.5-0-6 Amps
or lower and input voltages of <16V
since no heatsink is used, and epoxy does not dissipate heat as well as metal would. Four leads are pre-attached: V+ and 0V input, and 12.0V and 0V output. Email email@example.com
if you are interested in ordering this type of regulator.
Related REUK.co.uk ArticlesFind out how to use an LM2940 to efficiently regulate voltage
Connect voltage regulators in parallel to increase the current which can be regulated