The voltage range of power source could be given for this circuit board is between 7V and 15V. Higher input voltage will produce more heat at LM7805 voltage regulator. Typical voltage is 12V.Anyhow, LM7805 will still generate some heat at 12V.There are two type of power connector on the circuit board, DC plug ‘Adaptor’ is for AC-DC adaptor and 2510-02 ‘Power’ is for battery source. Normally AC to DC adaptor can be plugged to ‘Adaptor’ type connector. LM7805 (1A maximum) will regulate the given voltage to 5V (Vcc) for supplying power to the PIC16F876A and pull-up the push button (input). The purpose of using diode (D1) is for circuit protection in case the polarity of the power source is incorrect.Capacitor (C5) and capacitor (C1) is use to stabilize the voltage input and output of the LM7805. DS1 is a green LED (small) as power indicator.
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