In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:

What's the input to the 7805?  

If it's 12V, then, rule-of-thumb, you have 8V "across" the regulator and at 50mA you're close to 1/2W dissipation (8V X 50mA = 400mW) and that can be pretty hot when it's concentrated so.

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