lm340t12 datasheet
In fact you can pay more for a TO-92 type rated at 100 ma than you would for a TO-220 type rated at 1.5A When you have a requirement for a project of say 12V, or even 5V if it's a digital project, then these are the types you use. Now the first thing I'm going to recommend for small projects, is discard everything to the left of the four diodes D1 - D4 and use a plug pack wall wart in US . The type of regulator discussed here LM340-12 or 7812 types REQUIRE a minimum input voltage to function and there is a maximum they will accept. Just remember to buy a plug pack which will deliver at least the minimum required input voltage at your current requirement don't buy without first scrounging around your relatives, friends and neighbours - recent statistics must surely indicate there are more plug packs around than there are people on this earth . Hokay!, I just found a 15V D.C plug pack capable of 1A Suits me fine for my project. I also have on hand a 4700uF / 25V , this is also fine and I have a LM340-12 regulator of the TO-220 type as well. A decent heatsink needs to be connected to the IC because if you are drawing appreciable current AND your input voltage is getting higher then the IC starts to dissipate a fair bit of . The socket depicted is a panel mount type to suit the plug pack plug, you could dispense with that by bringing wires directly into project box but then your plug pack can't be used for something else! I'm NOT going to get into that because there are more problems here than there are in a can of red backs black widows . as I don't have such a requirement I'm not about to spend the money on it megabucks to say the least - and largely forget surplus power supplies because they create other problems . This is straight from a National Semiconductor data sheet, will supply a variable voltage 1.2V - 25V and up to 10A I will assume you obviously have available a source of D.C.
lm340t12 datasheet
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