Help With Circuit
March 13, 2011
I have designed this circuit, a voltage regulator at 30ma. It uses zener diodes to regulate the voltage and resistors to lower Amperage to 30ma.
Now I know it might sound stupid to lower the voltage this way, but I am new to this and I wanted to start with something like this.
The PIC16F877 receives signals from the buttons. Each time you press one of the buttons the pin that is high changes, activating a diferent transistor and so making 12v flow through a diferent zener.
Before etching this I would like to know what do you think about it, if there is anything wrong if something could be made diferent.
(I have checked the transistor part, but not the seven segment display, since the code isnt finished yet. )
Finally am I in need of a crystal or oscillator here? Because of the seven segments? What would the value be then.
Green box= Zener diode
Orange Box= resistor
Blue box= 7 segment display
Pinkish Box= jumper wire