This circuit is a coach for the PIC16F877A, which consists of a connector for each of its ports and contains the oscillator, Reset jumper and the power supply.
Jumper is responsible for putting under the RST at the MCU.
power supply operates on a positive regulator LM7805 that through the capacitor of 100nF 470uF/16V and achieves a good quality filter for the MCU, the 1N4007 diode was not the purpose of entering with current Alternatively, but this serves as input polarity protection, ie if we connect the source, the circuit works, but if you plug it into reverse, the diode can not be done in reverse feed the circuit.
below will show the circuit diagrams, component layout and PCB. 
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