G
Guest
Guest
Does anyone have a circuit for a 12/13.8volt 5A regulated power supply?
halcyon
Well-known member
Are you trying to get from 12 to 13.8 volt, ?
From what source ?
What for ?
Brian
From what source ?
What for ?
Brian
oldharry
Well-known member
Depends on the amperage you are looking for. Try WWW.Maplins.co.uk who have a wide range of Voltage regulators both fixed and variable.
Bergman
New member
Unless you particularly want to build one its probably better to buy it. Unlikely to be much more expensive.
Maplins probably the best source Farnells an alternative but more expensive.
Maplins probably the best source Farnells an alternative but more expensive.
rogerm
New member
Assuming you have a 'raw' DC supply of about 15+ volts from wherever then you need just 4 components. A 7812 ic will give you 12v regulated but only at one amp. To step it up to about 5-7A feed the o/p of the 7812 into the base connection of a 2N3055 transistor (or something similar) on a heatsink!. Connect the collector of the 2N3055 to the raw dc supply. On the emitter of the 3055 you will get a 'sensibly' regulated voltage of about 11.3v. I say 'sensibly' as it will be fine for running anything that normally runs from a 12v supply but might vary over perhaps 100mv or so. If you would like to get nearer to 13.8v then get a small zener of about 2.2v between the center (ground) connection of the 7812 and ground and a 4K7 resistor between the junction of the centre pin and the 7812 o/p pin. This will jack up the o/p voltage to about 13.5v. If you are having trouble following this then send me your PEM and I will send you a cct.
Roger
Roger
