Difference between revisions of "VW Electrics Smooth 12v/5v supply"
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With the addition of a few capacitors to further smooth out the supply, you can build a simple and effective power source at one or more voltage levels. | With the addition of a few capacitors to further smooth out the supply, you can build a simple and effective power source at one or more voltage levels. | ||
Heres a summary of the circuit: | Heres a summary of the circuit using a 12v regulator (for 5v you'd substitute with an LM7805): | ||
[[File:smoothed12vsupply.jpg]] | |||
Revision as of 18:10, 21 December 2015
These days, we run laptops and other items that need a smoother or even reduced supply compared to the nominal 12.5V supply, particularly if the engine is running when the voltage can reach 14v. The dash clocks use a fixed 10v supply for part of the circuit and this is maintained by a voltage regulator fixed to the back of the clocks.
Relatively cheap, voltage regulators have three legs and come in various sizes as follows:
LM7805 (5v) LM7809 (9v) LM7812 (12v)
With the addition of a few capacitors to further smooth out the supply, you can build a simple and effective power source at one or more voltage levels.
Heres a summary of the circuit using a 12v regulator (for 5v you'd substitute with an LM7805):
