VW Electrics Smooth 12v/5v supply - Revision history

CovKid at 16:04, 23 December 2015

2015-12-23T16:04:41Z

← Older revision		Revision as of 16:04, 23 December 2015
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	If you really want to go to town on this, you can create a really good, stable little power supply on hookup (240v) from an old computer ATX power supply as follows:		If you really want to go to town on this, you can create a really good, stable little power supply on hookup (240v) from an old computer ATX power supply as follows:

	https://www.youtube.com/watch?v=z2oSFpKh_Uw		https://www.youtube.com/watch?v=z2oSFpKh_Uw

	https://www.youtube.com/watch?v=GSzVs7_aW-Y		https://www.youtube.com/watch?v=GSzVs7_aW-Y

CovKid at 16:04, 23 December 2015

2015-12-23T16:04:23Z

← Older revision		Revision as of 16:04, 23 December 2015
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	'''Mains Hookup Power Supply'''		'''Mains Hookup Power Supply'''

	If you really want to go to town on this, you can create a really good, stable little power supply on hookup (240v) from an old computer ATX power supply as follows: https://www.youtube.com/watch?v=z2oSFpKh_Uw		If you really want to go to town on this, you can create a really good, stable little power supply on hookup (240v) from an old computer ATX power supply as follows:
			https://www.youtube.com/watch?v=z2oSFpKh_Uw

	https://www.youtube.com/watch?v=GSzVs7_aW-Y		https://www.youtube.com/watch?v=GSzVs7_aW-Y

CovKid at 16:03, 23 December 2015

2015-12-23T16:03:45Z

← Older revision		Revision as of 16:03, 23 December 2015
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	''12v Power Supply'''		'''12v Power Supply'''

CovKid at 16:03, 23 December 2015

2015-12-23T16:03:26Z

← Older revision		Revision as of 16:03, 23 December 2015
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	Covkid & Ghost123UK:		Covkid & Ghost123UK:

	'''Simple Power Supply'''		'''Simple Low Voltage Power Supply'''

	These days, we run items that need a lower supply than 12.5V, and if you've got something that uses say 9v or 5v, although you could plug in an adapter, this isn't always ideal if the item is permanent. You can get round this by making up a simple voltage dropper - for that you'll need a voltage regulator.		These days, we run items that need a lower supply than 12.5V, and if you've got something that uses say 9v or 5v, although you could plug in an adapter, this isn't always ideal if the item is permanent. You can get round this by making up a simple voltage dropper - for that you'll need a voltage regulator.
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	A great video explaining the principles can be found here: https://www.youtube.com/watch?v=GSzVs7_aW-Y		A great video explaining the principles can be found here: https://www.youtube.com/watch?v=GSzVs7_aW-Y

	'''12v Power Supply'''
			''12v Power Supply'''


	[[File:12Vregulator.jpg]]		[[File:12Vregulator.jpg]]

CovKid at 16:02, 23 December 2015

2015-12-23T16:02:53Z

← Older revision		Revision as of 16:02, 23 December 2015
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	Covkid:		Covkid & Ghost123UK:

	'''Simple Power Supply'''		'''Simple Power Supply'''

CovKid at 16:02, 23 December 2015

2015-12-23T16:02:35Z

← Older revision		Revision as of 16:02, 23 December 2015
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	[[File:~~12vregulator~~.jpg]]		[[File:12Vregulator.jpg]]

CovKid at 16:01, 23 December 2015

2015-12-23T16:01:44Z

← Older revision		Revision as of 16:01, 23 December 2015
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	Unfortunately the LM7812 can't be used in a T25 as it needs a headroom voltage of about 14.5v. However, with the addition of a few capacitors to remove interference from other electrical items, you can build a simple and effective power source at lower voltages. They're cheap and easy to build and a whole lot less than ones you can buy - even on ebay. Check the amp rating will be suitable for your appliance though.		Unfortunately the LM7812 can't be used in a T25 as it needs a headroom voltage of about 14.5v (see below for a 12v solution). However, with the addition of a few capacitors to remove interference from other electrical items, you can build a simple and effective power source at lower voltages. They're cheap and easy to build and a whole lot less than ones you can buy - even on ebay. Check the amp rating will be suitable for your appliance though.

	Heres a simple circuit using an LM7812 regulator (for reference only):		Heres a simple circuit using an LM7812 regulator (for reference only):
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	A great video explaining the principles can be found here: https://www.youtube.com/watch?v=GSzVs7_aW-Y		A great video explaining the principles can be found here: https://www.youtube.com/watch?v=GSzVs7_aW-Y

			'''12v Power Supply'''


			[[File:12vregulator.jpg]]

CovKid at 10:36, 23 December 2015

2015-12-23T10:36:22Z

← Older revision		Revision as of 10:36, 23 December 2015
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	'''Simple Power Supply'''		'''Simple Power Supply'''

	These days, we run items that need a lower supply than 12.5V, and if you've got something that uses say 9v, although you could plug in an adapter, this isn't always ideal. You can get round this by making up a simple voltage dropper ~~but~~ for that you'll need a voltage regulator.		These days, we run items that need a lower supply than 12.5V, and if you've got something that uses say 9v or 5v, although you could plug in an adapter, this isn't always ideal if the item is permanent. You can get round this by making up a simple voltage dropper - for that you'll need a voltage regulator.

CovKid at 10:34, 23 December 2015

2015-12-23T10:34:30Z

← Older revision		Revision as of 10:34, 23 December 2015
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	~~With~~ the addition of a few capacitors to remove interference from other electrical items, you can build a simple and effective power source at ~~one or more voltage levels~~. They're cheap and easy to build and a whole lot less than ones you can buy - even on ebay. Check the amp rating will be suitable for your appliance though.		Unfortunately the LM7812 can't be used in a T25 as it needs a headroom voltage of about 14.5v. However, with the addition of a few capacitors to remove interference from other electrical items, you can build a simple and effective power source at lower voltages. They're cheap and easy to build and a whole lot less than ones you can buy - even on ebay. Check the amp rating will be suitable for your appliance though.

	Heres a simple circuit using an LM7812 regulator (for reference only):		Heres a simple circuit using an LM7812 regulator (for reference only):

CovKid at 10:30, 23 December 2015

2015-12-23T10:30:34Z

← Older revision		Revision as of 10:30, 23 December 2015
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	'''Simple Power Supply'''		'''Simple Power Supply'''

	These days, we run ~~laptops and other~~ items that need a ~~smoother or even reduced~~ supply ~~compared to the nominal~~ 12.5V ~~supply~~, and if ~~the engine is running~~, ~~the voltage~~ can ~~reach 14v. A raw supply is fine for some items but most modern electronics require a bit more precision than~~ this~~. For instance, the dash clocks in~~ a ~~T25 use a fixed 10v regulated supply~~ for ~~part of the circuit and this is achieved by~~ a voltage regulator ~~fixed to the back of the clocks rated at 10v - LM7810~~.		These days, we run items that need a lower supply than 12.5V, and if you've got something that uses say 9v, although you could plug in an adapter, this isn't always ideal. You can get round this by making up a simple voltage dropper but for that you'll need a voltage regulator.


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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. They're cheap and easy to build and a whole lot less than ones you can buy - even on ebay. Check the amp rating will be suitable for your appliance.		With the addition of a few capacitors to remove interference from other electrical items, you can build a simple and effective power source at one or more voltage levels. They're cheap and easy to build and a whole lot less than ones you can buy - even on ebay. Check the amp rating will be suitable for your appliance though.

			Heres a simple circuit using an LM7812 regulator (for reference only):
	Heres a simple circuit using an LM7812 ~~12v~~ regulator (for ~~5v you'd substitute with an LM7805~~):

	[[File:smoothed12vsupply.jpg]]		[[File:smoothed12vsupply.jpg]]

	'Input' refers to red wire from battery or other dash 12v power lead, 'output' to the item that needs the fixed supply. Earth (chassis) is common to both. I recently purchased a 12v notebook to make things simpler in the camper - no need for voltage increasers, and three components provide a perfect power source. These type of voltage regulators are less efficient when you're dropping from 12.5v to say 5v, as more is lost in heat (hence the need for a heatsink), but dropping your battery supply to just a fixed 12v is fine as the change is slight.		'Input' refers to red wire from battery or other dash 12v power lead, 'output' to the item that needs the fixed supply. Earth (chassis) is common to both.

	A great video explaining the principles can be found here: https://www.youtube.com/watch?v=GSzVs7_aW-Y		A great video explaining the principles can be found here: https://www.youtube.com/watch?v=GSzVs7_aW-Y