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

Chris,

the capacitor must not be that big. According to the specs of the LM2940 regulator, the output capacitor must be at least 22µF, located as close as possible between ground and the regulator's output pin. More important is that the capacitor has a low ESR (Equivalent Series Resitance). Therefore, a tantalum capacitor would be best, or a larger lauminum cap with a smaller tantalum in parallel.

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