Will the heat generated by LM317 and 7805 burn the resistors and the capacitors in the circuit?
I have made a lot of these voltage dropping things with big heat sinks but still the heat sink is very hot. Thinking that it will burnt the capacitors and resistor, I have fixed a 12v CPU fan on top of the heat sink. but my portable CD player pick up the fan noise in between the songs.
it depends on current requirement.
if current requiement not so mush (less than 1 A), you can use 7805 without heaksink.
if you need more current requirment, I think you should zener diode and transistor combinition. By use zener diode (~5.2V)to bias at bias and output at corrector(For npn transistor).
On what kind of circuit are you going to use it? Any voltage regulator becomes hot if it can't hold the current that passes through it. So tell me on what kind of circuit you will use it.
Basically Viper911 has not, If I am correct, specified the load requirements of the proposed converter execpt that it is for so and so....
However, it appears best to use LM257x as these are generally available locally. with minimum effort one could realize a regulator by following the datasheet. and with good efficiency.
I know this post has been done since 2007 however if anyone else would like to know how to wire the LM7805 that can take 12volt to 5volt, lots of people use this for automotive purposes or for microcontrollers, please check out this step by step. I have tried to put pictures of every single step to show how it needs to be wired...**broken link removed**