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  1. N

    Help With LM338 Voltage Regulator

    Ah, I understand the resistor issue now. And good call on the PC PSU, I've got a load of those knocking about... Many thanks for your help.
  2. N

    Help With LM338 Voltage Regulator

    Thanks for the info, Steve. Could you tell me what effect a 1K resistor for R1 would have compared to using the typical 120-240 Ohm resistor? Yes, I think it would be best to find another old PSU that has a lower voltage, and decent current capability, for the input. :D
  3. N

    Help With LM338 Voltage Regulator

    Hi, I would be grateful for any help in calculating how much heat an LM338 (TO-220 Package) voltage regulator will generate and what heatsink is required in the following application: I want to build a variable voltage power supply for an electronic cigarette atomiser using items that I...
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